Operation Models Slides

7/30/2019 Operation Models Slides

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LEVEL 1


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INSTAPHOTO - WHERE WE LEFT IT


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WHY MODELS?

Controllers tell Views how

to display data

Views display app data

Models handle app data

from Models

Models make it easy to organize and store data in an a


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DATA IN INSTAPHOTO - THE CURRENT APPROA

Controllers drawing Views using data from a Controller

data passed whencell tapped

Thats no g

FeedTableVC PhotoVC

View View


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DATA IN INSTAPHOTO - THE MVC WAY

Controllers drawing Views using data from a Model

Controller

asks for data

Model provides

data object

model instancepassed when celltapped

FeedTableVC PhotoVC

View View

Model


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CREATING A MODEL CLASS IN XCODE


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CLASS HIERARCHY OF A MODEL

NSObject is the base parent Class of almost everything

@interface Place : NSObject

NSObject

UIResponder

UIViewController

UITabBarController UINavigationController

Place

Class Name Parent Class

Model is a subclassof NSObject


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PLANET HIG

Straight to the TOP

of the APP STORE!


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PLANET HIG CLASS STRUCTURE

CityViewControlPlaceTableViewController InterestingPlacesTableViewController

AppDelegate


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PLACE MODEL @INTERFACE AND @IMPLEMEN

Place.h

Place.m

singular name, not plu

#import"Place.h"

@implementation Place

@end

#import


@end


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DECLARING PLACE MODEL @PROPERTY VARIA

#import

@end

Place.h


@property (strong, nonatomic)NSString*name;

@property (strong, nonatomic)NSString*description;NSStr


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IMPLEMENTING INIT IN THE PLACE MODEL

#import"Place.h"

@end

Place.m

@implementation Place

selfrefers to an instance of this Class (Place)superrefers to the parent Class (NSObject)

NSOb

Place

-(id)i[super init]

self supe

- (id)init {

self = [superinit];

return self;

}


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MODEL OBJECT INSTANTIATION

PlaceViewController.m

console output

> name is: Taco Cantina> description is: Tasty tacos.

Access valuesor message pa

Place *aPlace = [[Place alloc] init];

aPlace.name = @"Taco Cantina";aPlace.description = @"Tasty tacos.";

NSLog(@"name is: %@", [aPlace name]);NSLog(@"description is: %@", aPlace.description);


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INSTANTIATE MULTIPLE OBJECTS WITH ONE M


Place *placeOne = [[Place alloc] init];

Place *placeTwo = [[Place alloc] init];Place *placeThree = [[Place alloc] init];

@"Taco Cantina"

@"Tasty tacos."

@"Fish Town"

@"Scrumptious sushi."

@"Envy Labs"

@"Enviable educators."

placeOne.name =placeTwo.name =placeThree.name =

placeOne.description =placeTwo.description =placeThree.description =

;;;

;;;

Thats a l

of repeti


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OBJECT INSTANTIATION WITH A CONVENIENCE INIT


Place *placeOne = [[Place alloc] init

Place *placeTwo = [[Place alloc] init

Place *placeThree = [[Place alloc] init

];

@"Taco Cantina"

@"Fish Town"

@"Envy Labs"

@"Tasty tacos."

@"Scrumptious sushi

@"Enviable educat

initWithName:description: is called a convenience initiali

WithName:

description:

WithName:description:

WithName:description:


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DECLARING A CONVENIENCE INITIALIZER

@end

Place.h

- (id)initWithName:(NSString *)aName

description:(NSString *)aDescription;

#import



@property (strong, nonatomic)NSString*description;


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IMPLEMENTING A CONVENIENCE INITIALIZER

Place.m

{


Place *placeOne = [[Place alloc] initWithName:@"Taco Cantina"

description:@"Tasty tacos."];

local argumentsmodel properties

verify [superintrying to set prop


description:(NSString *)aDescription

self = [superinit];if(self) {

self.name = aName;self.description = aDescription;

}return self;

}

THE PROBLEM WITH INIT


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description:@"Tasty tacos."];

THE PROBLEM WITH INIT


Place *placeTwo = [[Place alloc] init];

NSLog(@"placeOne name: %@", placeOne.name);

NSLog(@"placeTwo name: %@", placeTwo.name);

Console output> placeOne name: Taco Cantina

> placeTwo name: nil

What COUNT

NIL IN????

CONVERTING TO A DESIGNATED INITIALIZER


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CONVERTING TO A DESIGNATED INITIALIZER

Place.m

@end


description:(NSString *)aDescription {

self = [superinit];

if(self) { self.name = aName; self.description = aDescription;

}return self;

}

- (id)init {self = [self initWithName:@"defaultName"

description:@"defaultDescription"];return self;

}

USING A DESIGNATED INITIALIZER


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USING A DESIGNATED INITIALIZER


Console output

> placeOne name: Taco Cantina> placeTwo name: defaultName

init triggers the designated initializerinitWithName:description:


description:@"Tasty tacos."];Place *placeTwo = [[Place alloc] init];

NSLog(@"placeOne name: %@", placeOne.name);

NSLog(@"placeTwo name: %@", placeTwo.name);

MODEL CONVENTIONS


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MODEL CONVENTIONS

@property memory management

@property (strong, nonatomic);

Arguments should start with a, an, or the

- (id)initWithCity:(NSString *)city address:(NSString *)address

- (id)initWithCity:(NSString *)aCity address:(NSString *)anAddres

Long method names on multiple lines lined up by colons

- (id)initWithCity:(NSString *)aCity address:(NSString *)anAddres

- (id)initWithCity:(NSString *)aCity address:(NSString *)anAddress


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LEVEL 2

CITYVIEWCONTROLLER IN PLANET HIG


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CITYVIEWCONTROLLER IN PLANET HIG

ViewCityViewController

nameLabel stateLabel p

Lets see where this city data comes f

FETCHING THE CITY DATA FOR PLANET HIG


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FETCHING THE CITY DATA FOR PLANET HIG

2 NSStrings

1 NSNumber

1 NSDictionary containing:

CityViewController.h

@property (strong, nonatomic) NSDictionary *cityData;

http://example.com/cityData.json

old way

{

"name": "Orlando","state": "Florida",

"population": 238300

}

FETCHING CITYDATA JSON WITH AFNETWORK
http://remote.com/cityData.JSONhttp://remote.com/cityData.JSON


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FETCHING CITYDATA.JSON WITH AFNETWORK

self.cityData = JSON;

NSLog(@"NSError: %@",error.localizedDescription);

}];

[operation start];

AFJSONRequestOperation *operation = [AFJSONRequestOperationJSONRequestOperationWithRequest:requestsuccess:^(NSURLRequest *request, NSHTTPURLResponse *response, id

} failure:^(NSURLRequest *request, NSHTTPURLResponse *response,

NSError *error, id J

[self dataRetrieved];

CityViewController.m

NSURL *url = [[NSURL alloc] initWithString:@"http://codeschool.com/c

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

USING THE JSON RESPONSE IN DATARETRIEVED
http://codeschool.com/placeData.jsonhttp://codeschool.com/placeData.json


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USING THE JSON RESPONSE IN DATARETRIEVED

self.cityData = JSON;

AFJSONRequestOperation *operation = [AFJSONRequestOperation

JSONRequestOperationWithRequest:requestsuccess:^(NSURLRequest *request, NSHTTPURLResponse *response, id

}[self dataRetrieved];

...

- (void)dataRetrieved {

NSLog(@"City name is: %@", self.cityData[@"name"]);NSLog(@"City state is: %@", self.cityData[@"state"]);

NSLog(@"City population is: %@", self.cityData[@"population"]);

}

This seems like a go

place For a Model


LETS CREATE THE CITY MODEL


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LET S CREATE THE CITY MODEL

#import

@interface City : NSObject

@property (strong, nonatomic)NSString*name;@property (strong, nonatomic)NSString*state;

@property (strong, nonatomic)NSNumber*population;

@end

City.h

#import"City.h"@implementation City

- (id)init {

self = [superinit];

return self;

}

@end

City.m

PUTTING THE JSON RESPONSE IN A MODEL


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PUTTING THE JSON RESPONSE IN A MODEL

self.city.name = JSON[@"name"];

AFJSONRequestOperation *operation = [AFJSONRequestOperationJSONRequestOperationWithRequest:requestsuccess:^(NSURLRequest *request, NSHTTPURLResponse *response, id J

}

[self dataRetrieved];

...

self.city.state = JSON[@"state"];

self.city.population = JSON[@"population"];


@property (strong, nonatomic) City *city;

self.city = [[City alloc] init];


Seems like we can improv

#import"City.h"

NSLog(@"City name is: %@", self.city.name);

NSLog(@"City state is: %@", self.city.state);

NSLog(@"City population is: %@", self.city.population);


}

INITIALIZING MODEL DATA IN A CONTROLLER


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INITIALIZING MODEL DATA IN A CONTROLLER

Controller is respfetching data, no

PROBLEM

View

City

CityViewController

INITIALIZING MODEL DATA IN A MODEL


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INITIALIZING MODEL DATA IN A MODEL

Model is responsi

fetching data, notController.

initWithJSON:

SOLUTION

convenienceinitializer

I love convenien

solutions

City

View

CityViewController

DECLARING AN INITWITHJSON CONVENIENCE INITIALIZER


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DECLARING AN INITWITHJSON CONVENIENCE INITIALIZER

City.h

- (id)initWithJSON;

#import@interface City : NSObject


@property (strong, nonatomic)NSString*state;


@end

IMPLEMENTING INITWITHJSON IN THE CITY M


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IMPLEMENTING INITWITHJSON IN THE CITY M

#import"City.h"

@end

City.m

@implementation City

- (id)init { self = [superinit];

return self;}



} return self;}

- (id)initWithJSON {

SETTING MODEL PROPERTIES USING INITWITH


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SETTING MODEL PROPERTIES USING INITWITH

City.m


}];

[operation start];

success:^(NSURLRequest *request, NSHTTPURLResponse *respon

failure:^(NSURLRequest *request, NSHTTPURLResponse *responsNSError *error

}

self.name = JSON[@"name"];

self.state = JSON[@"state"]; self.population = JSON[@"population"];

AFJSONRequestOperation *operation = [AFJSONRequestOperationJSONRequestOperationWithRequest:request

self = [superinit];

if(self) {

} return self;

}


TESTING INITWITHJSON


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TESTING INITWITHJSON

self.city = [[Cityalloc] initWithJSON];

NSLog(@"state is: %@", self.city.state);

NSLog(@"population is is: %d", self.city.population);



#import"City.h"


nil

nil

What In the NIL Is GOING ON?

WHY INITWITHJSON ALONE IS NOT ENOUGH


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WHY INITWITHJSON ALONE IS NOT ENOUGH

initWithJSON:

View

City

CityViewController1. Controllerasks for Model

3a. Model

returns instance

2. Controllcontinues

3b. View di

No guarantee that 3a happens before 3b

USING NOTIFICATIONS TO DELAY EXECUTION


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initWithJSON:

View

City

CityViewController1. Controllerasks for Model

3. Model posts notificationwhen ready

2. Con

notifi

5. Viedata

NSNotificationCenter

4. Consendswhenis hea

NSNOTIFICATIONCENTER


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NSNotificationCenter

postednotification

subscribes

notificationlistener



notifies

POSTING AND LISTENING FOR NOTIFICATIONS


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[[NSNotificationCenterdefaultCenter]

addObserver:self selector:@selector(dataRetrieved

name:@"initWithJSONFinishedL

object:nil];


postNotificationName:@"initWithJSON object:nil];

Sending a Notification

Listening for a Notification

ObserverInstance that is listening

SelectorMethod to call whennotification is heard

Name

Unique notification nameObjectCan listen for notificationsfrom a specific object

POSTING A NOTIFICATION IN INITWITHJSON


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J

City.m ( inside initWithJSON )

success:^(NSURLRequest *request, NSHTTPURLResponse *respon

}

self.name = JSON[@"name"]; self.state = JSON[@"state"];

self.population = JSON[@"population"];


JSONRequestOperationWithRequest:request


postNotificationName:@"initWithJSONFinishedLoadin

object:nil];

Post a notification in the last line of the success block

LISTENING FOR A NOTIFICATION IN A CONTRO


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- (void)viewDidLoad {

Florida

238300




}

self.city = [[Cityalloc] initWithJSON];


addObserver:self

selector:@selector(dataRetrieved)

name:@"initWithJSONFinishedLoading"

object:nil];

MAKING INITWITHJSON THE DESIGNATED INIT


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J

#import"City.h"

@end

City.m





}

return self;}

- (id)init {

self = [selfinitWithJSON];return self;

}

CALLING INIT INSTEAD OF INITWITHJSON


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self.city = [[Cityalloc] init];


addObserver:self

selector:@selector(dataRetrieved)

name:@"initWithJSONFinishedLoading"

object:nil];



}

Notification n

OHyeaaaaaaa

Florid

238300




}

INSTAPHOTOS USER.H BEFORE PHOTO REFACT


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User.h

#import

@interface User : NSObject

@property (strong, nonatomic)NSString*firstName;

@property (strong, nonatomic)NSString* ;profilePhoto@property (strong, nonatomic)NSString* ;profilePhotoThumbnail@property (strong, nonatomic)NSString*biography;@property (strong, nonatomic)NSString*memberSince;

@end

- (void)initWithJSON;

@property (strong, nonatomic)NSString*lastName;

@property (strong, nonatomic)NSString*location;

INSTAPHOTOS USER.H AFTER PHOTO REFACTO


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User.h

#import

@end

@interface User : NSObject

@property (strong, nonatomic)Photo* ;profilePhoto

#import"Photo.h"

@property (strong, nonatomic)NSString*biography;@property (strong, nonatomic)NSString*memberSince;

- (void)initWithJSON;

CityViewCo

User

@property (strong, nonatomic)NSString*firstName;

@property (strong, nonatomic)NSString*lastName;

@property (strong, nonatomic)NSString*location;

INSTAPHOTOS USER MODEL PROFILEPHOTO


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User.m


- (id)initWithJSON { self = [superinit];

if(self) {

This data should be in a Photo Model

self.firstName = JSON[@"firstName"]; self.lastName = JSON[@"lastName"]; self.location = JSON[@"location"];

self.biography = JSON[@"biography"]; self.memberSince = JSON[@"memberSince"];

self.profilePhotoself.profilePhotoThumbnail

==JSON[@"profilePhoto"]JSON[@"profilePhotoThumb

;

...

...


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LEVEL 3

PLANET HIG STRUCTURE SO FAR


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CityViewControllePlaceTableViewController InterestingPlacesTableViewController

AppDelegate

Lets see how this table view gets data

EXAMINING PLACEDATA.JSON


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an NSArray co

NSDictionary

http://example.com/placeData.json

[

{

"name": "Taco Cantina",

"description": "Tasty tacos."

},

{

"name": "Fish Town",

"description": "Scrumptious sushi."

},{

"name": "Envy Labs",

"description": "Enviable educators."

}

]

each NSDictio

contains 2 NSS

MAKING AN AFNETWORKING REQUEST FOR PLACEDA
http://example.com/placeData.jsonhttp://example.com/placeData.json


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PlaceTableViewController.h

@property (strong, nonatomic) NSArray *places;

PlaceTableViewController.m

NSURL *url = [[NSURL alloc] initWithString:@"http://example.com/place

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];



success:^(NSURLRequest *request, NSHTTPURLResponse *response, id J

self.places = JSON;} failure:^(NSURLRequest *request, NSHTTPURLResponse *response,

NSError *error, id JSON) {


}];

[operation start];

This approach isnt creating Place

MAKING PLACE OBJECTS
http://codeschool.com/placeData.jsonhttp://codeschool.com/placeData.json


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PlaceTableViewController.h

#import"Place.h"

@property (strong, nonatomic) NSArray *places;

PlaceTableViewController.mAFJSONRequestOperation *operation = [AFJSONRequestOperation


success:^(NSURLRequest *request, NSHTTPURLResponse *response, id J

}

self.places = @[place1, place2, place3];

Not efficient - what if there are 20 objects?

Place*place1 = [[Placealloc]initWithName:JSON[0]["name"]

description:JSON[0]["descripti





USING FAST ENUMERATION


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0 1 2 3

Fluffy Pepper Whiskers HiggieCat

Console OutpNSArray *catNames> Cat name is

> Cat name is

> Cat name is

> Cat name is

a new Object that is local to theenumeration loop!

The set/array you areenumerating through

Now this is gospeed things ufor (NSString *catName in catNames) {

NSLog(@"Cat name is: %@",catName);

}

CREATE NSARRAY OF MODEL OBJECTS WITH FAST ENUM


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for (NSDictionary *oneDictionary in JSON) {

Place *newPlace = [[Placealloc] initWithName:oneDictionary[@" description:oneDictionary[@"

}

0 1 2

Place object 1 Place object 2 Place object 3

NSArray *places

Our goal

[self.placesaddObject:newPlace];

Cant modify an NSArray

LIST OF MUTABLE CLASSES


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Immutable Classes Mutable Classes

NSString NSMutableString

NSSet NSMutableSet

NSArray NSMutableArray

NSDictionary NSMutableDictionary

NSData NSMutableData

NSURLRequest NSMutableURLRequest

Mutable Class objects can be modified after they are inst

ADDING OBJECTS TO AN NSARRAY VIA A TEMPORARY NSMUTA


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for (NSDictionary *oneDictionary in JSON) {

Place *newPlace = [[Placealloc] initWithName:oneDictionary[@" initWithDescription:oneDictionary[@"

}

0 1 2

Place object 1 Place object 2 Place object 3

NSArray *places

NSMutableArray *tempArray = [[NSMutableArrayalloc] init];

[tempArray addObject:newPlace];

self.places = [[NSArrayalloc] initWithArray:tempArray];

creating an immutable version with an existing mutable array

We can add objects to mut

PLACETABLEVIEWCONTROLLER UITABLEVIEW M


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Easy! Weve Done this

a few times before


- (NSInteger)tableView:(UITableView *)tableView

numberOfRowsInSection:(NSInteger)section {

- (UITableViewCell *)tableView:(UITableView *)tableView

cellForRowAtIndexPath:(NSIndexPath *)indexPath {

}

- (void) tableView:(UITableView *)tableViewdidSelectRowAtIndexPath:(NSIndexPath *)indexPath {

}

}

UITABLEVIEW NUMBEROFROWSINSECTION: FROM PLACES @


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}


returnself.places.count;





- (void) tableView:(UITableView *)tableViewdidSelectRowAtIndexPath:(NSIndexPath *)indexPath {

}

}

UITABLEVIEW CELLFORROWATINDEXPATH: FROM PLACES @


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UITableViewCell *cell = [tableView dequeueReusableCellWithIdenti

if(cell == nil) {cell = [[UITableViewCellalloc] initWithStyle:UITableViewCel

reuseIdentifier:@"pCell"];}

return cell;

Incorrect syntax



}

.name;cell.textLabel.text = self.places[indexPath.row]

THE CORRECT WAY TO ACCESS MODEL OBJECT PRO


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Correct syntax using message






return cell;

}

]name ;cell.textLabel.text = self.places[indexPath.row][

PUSH A PLACE MODEL INSTANCE WHEN A CELL IS


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[tableView deselectRowAtIndexPath:indexPath animated:YES];

}

PlaceViewController *placeVC = [PlaceViewController alloc] init]

placeVC.place = self.places[indexPath.row];

[self.navigationControllerpushViewController:placeVC animated:Y

PlaceTableViewController Cell PlaceV

Place Model instance passed when cell is tapped

- (void) tableView:(UITableView *)tableView

didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


PLACETABLEVIEWCONTROLLER


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DECLARING A PLACE @PROPERTY VARIABLE IN PLACEVIEWCO


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PlaceViewController.h

@property (strong, nonatomic) Place *place;

@interface PlaceViewController:UIViewController

@property (strong, nonatomic) UILabel *placeNameLabel;

#import"Place.h"

PlaceViewController Place

@property (strong, nonatomic) UILabel *placeDescriptionLabel;

IMPLEMENTING SUBVIEWS IN PLACEVIEWCONTR

Pl Vi C t ll


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self.placeNameLabel = [[UILabelalloc] init];

self.placeNameLabel.frame = CGRectMake(20,40,280,40);[self.viewaddSubview:self.placeNameLabel];

self.placeDescriptionLabel = [[UILabelalloc] init];

self.placeDescriptionLabel.frame = CGRectMake(20,100,280,20);

[self.viewaddSubview:self.placeDescriptionLabel];

}

- (void)viewWillAppear:(BOOL)animated {

self.placeNameLabel.text = self.place.name;

self.placeDescriptionLabel.text=self.place.description;

}

create data containers in viewDidLoad

set data in containers in viewWillAppear

PUSHING TO PLACEVIEWCONTROLLER


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DECLARING @PROPERTY VARIABLES IN CITYVIEWCON

CityViewController h


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@interface CityViewController : UIViewController

@property (strong, nonatomic) UILabel *cityNameLabel;

#import"City.h"

CityViewController City

@property (strong, nonatomic) UILabel *cityStateLabel;

@property (strong, nonatomic) UILabel *cityPopulationLabel;

like

did w

IMPLEMENTING SUBVIEWS IN CITYVIEWCONT


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self.cityNameLabel = [[UILabelalloc] init];

self.cityNameLabel.frame = CGRectMake(20,40,280,40);

[self.viewaddSubview:self.cityNameLabel];

}


self.cityNameLabel.text = self.city.name;

}

Repeat for state and population data properties

CITYVIEWCONTROLLER


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PLANET HIG STRUCTURE SO FAR

A D l t


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CityViewPlaceTableViewController

PlaceViewController

InterestingPlacesTableViewController

AppDelegate


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LEVEL 4

ADDING THE ABILITY TO TAKE NOTES ABOUT A


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It really is a useful

ADDING A NOTES @PROPERTY TO THE CITY MO

Cit h


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#import

@end

City.h



- (id)initWithJSON;



@property (strong, nonatomic)NSString*notes;

INITIALIZING THE DEFAULT VALUE OF NOTES IN THE CI

City m


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@end


- (id)init { self = [self initWithJSON];

}

- (id)initWithJSON { self = [selfinit];

if(self) { ...

self.notes = @"no notes yet";...

}

return self;}

because the JSON file dohave any notes data

City.m

ADDING A UILABEL AND UITEXTFIELD FOR NOT



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y

@property (strong, nonatomic)UILabel*notesLabel;



self.notesLabel = [[UILabelalloc]init];

self.notesLabel.frame = CGRectMake(20,160,280,40);

}

@property (strong, nonatomic)UITextField*notesField;

@property (strong, nonatomic)City*city;

self.notesField = [[UITextFieldalloc]init];

self.notesField.frame = CGRectMake(15,220,290,30);

self.notesLabel.text = self.city.notes;

City *city=[[Cityalloc]init];

EDITING TEXT IN PLANET HIG


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UITextField

ACCESSING THE TEXT IN UITEXTFIELD

Setting the text


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Setting the text

self.notesField.text = @"Hi Jon!";

Getting the text

NSLog(@"%@",self.notesField.text);

Just like a UILabel that

you can edit!

LIST OF KEYBOARDTYPE VALUES UIKeyboardT


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UIKeyboardTypeASCIICapable

UIKeyboardTypeNumbersAndPunctuation

UIKeyboardTypeURL

UIKeyboardTypeNumberPad

UIKeyboardTypePhonePad

UIKeyboardTypeNamePhonePadUIKeyboardTypeEmailAddress

UIKeyboardTypeDecimalPad

UIKeyboardTypeTwitter

UIKeyboardTypeAlphabet

UIKeyboardT

UIKeyboardT

self.notesField.keyboardType = UIKeyboardTypeDefault;

Other keyboard types

LIST OF UITEXTFIELD BORDER STYLES


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self.notesField.borderStyle = UITextBorderStyleRoundedRect;

Border StylesUITextBorderStyleNone

UITextBorderStyleLine

UITextBorderStyleBezel

UITextBorderStyleRoundedRect

MAKING THE KEYBOARD GO AWAY


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Dismissing the keyboard

requires code from the

UITextFieldDelegate Clas

Tapping return shouldmake the keyboard goaway

UITEXTFIELDDELEGATE METHODS


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- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField;

Runs when the Return key is tapped

- (BOOL)textFieldDidBeginEditing:(UITextField *)textField;

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField;

- (BOOL)textFieldDidEndEditing:(UITextField *)textField;

- (BOOL) textField:(UITextField *)textFieldshouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;

- (BOOL)textFieldShouldClear:(UITextField *)textField;

- (BOOL)textFieldShouldReturn:(UITextField *)textField;

GETTING TEXTFIELDSHOULDRETURN: IN CITYVIEWCON

UITextFieldDelegate


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CityViewController

Protocols are a way to get

methods from one Class

into another

UITextFieldDelegate

SETTING UP THE UITEXTFIELDDELEGATE PROTO



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y

@interface CityViewController:UIViewController


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- (BOOL)textFieldShouldReturn:(UITextField *)textField{

}

// 1. Update the City Model object with the text in notesFiel

// 2. Make the keyboard go away


self.city.notes = self.notesField.text;

[textField resignFirstResponder];

returnYES;

WHICH VIEW IS THE FIRST RESPONDER?

ViCit Vi C t ll


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notesField is the F

Responder when t

keyboard is onscre


notesLabel notesField

WHICH VIEW IS THE FIRST RESPONDER?



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notesField is no lo

First Responder w

keyboard is dismis



PROBLEM: THE UITEXTFIELD IS IN CITYVIEWCONT


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SOLUTION: MOVE THE UITEXTFIELD TO ANOTHER CON


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EditNoteViewController CityViewController View

notesLabel

ADD A UIBUTTON TO SWITCH TO EDITNOTEVIEWCON



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}

UIButton *editButton = [UIButtonbuttonWithType:UIButtonTypeRound

editButton.frame = CGRectMake(20,220,280,50);

[editButton setTitle:@"Edit Note"forState:UIControlStateNormal]

[self.viewaddSubview:editButton];

[editButton addTarget:self

forControlEvents:UIControlEventTouchUpInside];

action:@selector(editPressed)

}

- (void)editPressed {

EditNoteViewController *editNoteVC = [[EditNoteViewControllerall

[self.navigationControllerpushViewController:editNoteVC animated

editNoteVC.city = self.city;

DECLARING @PROPERTY VARIABLES IN EDITNOTEVIEWCO

EditNoteViewController.h


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@interface EditNoteViewController:UIViewController


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}

self.notesField.delegate = self;

self.notesField.text = self.city.notes;


}

self.notesField = [[UITextFieldalloc]init];

self.notesField.frame = CGRectMake(15,50,290,30);

self.city=[[Cityalloc]init];

CREATE A UIBUTTON TO GET BACK TO CITYVIEWCON

EditNoteViewController.m


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}

UIButton *saveButton = [UIButtonbuttonWithType:UIButtonTypeRoun

saveButton.frame = CGRectMake(15,100,290,50);

[saveButton setTitle:@"Save Note"forState:UIControlStateNormal]

[self.viewaddSubview:saveButton];

[saveButton addTarget:selfaction:@selector(savePressed)

forControlEvents:UIControlEventTouch

}

- (void)savePressed {

[self.navigationControllerpopViewControllerAnimated:YES];


EDITNOTEVIEWCONTROLLER DE


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PUSHING EDITNOTEVC ONTO THE NAVIGATION S



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}


EditNoteViewController *editNoteVC = [[EditNoteViewControlleral

[self.navigationControllerpushViewController:editNoteVC animated


Only Use a Navigationcontroller stack if

need to move through a hierarchy of view

OPENING EDITNOTEVC AS A MODAL VIEW



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[selfpresentViewController:editNoteVCanimated:YEScompletion:n


EditNoteViewController *editNoteVC = [[EditNoteViewControlleral


}

MAKING A MODAL VIEW GO AWAY



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}

- (void)savePressed {

[selfdismissViewControllerAnimated:YES completion:nil];


USING A UIBARBUTTONITEM INSTEAD OF A UI



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}

returnself;

} Check the Apple docs for all of the UIBarButtonSyste

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)ni

self = [superinitWithNibName:nibNameOrNil bundle:nibBundleOrNil

if(self) {

self.title = @"City"; self.tabBarItem.image = [UIImageimageNamed:@"tab_icon_city"

self.navigationItem.rightBarButtonItem = editButton;

UIBarButtonItem *editButton = [[UIBarButtonItemalloc]

initWithBarButtonSystemItem:UIBarButtonSystemI

target:self

action:@selector(editPres

OPENING EDITNOTEVIEWCONT

WITH AS A MODAL VIEW


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PLANET HIG STRUCTURE SO FARAppDelegate


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CityViewContr

EditNoteView

PlaceTableViewController

PlaceViewController



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LEVEL 5

WHAT HAPPENS WHEN PLANECLOSED?


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AWW COME ON - It TOOK

FOREVER TO MAKE THAT

SAVING MODEL DATA USING THE NSCODING PR


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NSCoding all

easily store a

retrieve our NSString NSArray

Packaged Model Data

NSDictionary NSNumber

NSCoding

File

NSCODING IS LIKE A PACKING BOX

NSKeyedArchiver/Unarchiver


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NSCoding

NSCoding is thepacking box that

contains your data

NSKeyedArchiver

+

Unarchiver

F

(

is the delivery person

The

the

City

City.h


ADOPTING THE NSCODING PROTOCOL


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#import"City.h"

@end

City.m

- (id)init ...

@interface City:NSObject

- (id)initWithJSON ...

- (City*)initWithCoder:(NSCoder *)aDecoder {

}

- (void)encodeWithCoder:(NSCoder *)anEncoder {

}

initWithCoder

returnan instModel

must now impleinitWithCoder

encodeWithCod

IMPLEMENTING ENCODEWITHCODER:

City m

encodeWithCoder:formats data so it can be arc


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City.m

Use @property namesas key names

@"name"@"state"

@"population"

@"notes"];

]

];];

Model properties

[anEncoder encodeObject:[anEncoder encodeObject:

[anEncoder encodeObject:

[anEncoder encodeObject:

self.nameself.state

self.population

self.notes

forKey:forKey:

forKey:

forKey:

- (void)encodeWithCoder:(NSCoder *)anEncoder {

}

IMPLEMENTING INITWITHCODER:

City.m

initWithCoder:unpacks data into a new object


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y

- (City*)initWithCoder:(NSCoder *)aDecoder {

self = [super init];if(self) {

}

return self;

}

@"name"

@"state"

@"populati

@"notes"];

];

];

Use @property naas key names

Model properties

= [aDecoderdecodeObjectForKey:

= [aDecoder decodeObjectForKey:



self.name

self.state

self.population

self.notes

USE THE NSKEYED METHODS TO WORK WITH NinitWithCoder:andencodeWithCoder:dont get ca


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Unarchive a Model with initWithCoder

City *city = [NSKeyedUnarchiverunarchiveObjectWithFile:ARCHIVE_P

Archive a Model with encodeWithCoder

City *city = [[Cityalloc] initWithJSON];

[NSKeyedArchiverarchiveRootObject:city toFile:ARCHIVE_PATH];

both need a patharchive file (war

IOS APP FOLDER HIERARCHY

d


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APP App.bundle

DocumentsLibrary

tmp

Caches

Preferences

good place to saveModel data

read-only

PROGRAMMATICALLY ACCESSING THE DOCUMENTS

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDir


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Give your archives a meaningful na

Unarchive a Model

Archive a Model


archivePath];

archivePat

[docsDir stringByAppendingPathComponent:@"NSString *archivePath =

[NSKeyedArchiverarchiveRootObject:city toFile:

City *city = [NSKeyedUnarchiverunarchiveObjectWithFile:

NSUserDomainMY

NSString *docsDir = [paths objectAtIndex:0];

CREATING A CLASS METHOD TO FIND THE ARCHI

+ (NSString *)getPathToArchive {

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumen

Dont forget to also declare this meClass method


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Unarchive a Model

Archive a Model

[CitygetP

[CitygetPathToArch

City *city = [NSKeyedUnarchiverunarchiveObjectWithFile:


[NSKeyedArchiverarchiveRootObject:city toFile:

}

[docsDir stringByAppendingPathComponent:@"city.model"];return

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumenNSUserDom


CLASS METHODS TO SAVE AND RETRIEVE A MO

+ (NSString *)getPathToArchive {

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumen


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Just call these methods to save/retrieve the archive

+ (void)saveCity(City *)aCity {

}

+ (City *)getCity {

}

[NSKeyedArchiverarchiveRootObject:aCity toFile:

return [NSKeyedUnarchiverunarchiveObjectWithFile:

}

[docsDir stringByAppendingPathComponent:@"city.model"];return

City.m Class methods

[CitygetPat

[CitygetPathT


NSUserDomNSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumen

WHERE AND WHEN TO ARCHIVE A MODEL OBJAppDelegate During Instantiatio


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CityViewContr

EditNoteView


PlaceViewController


WHERE AND WHEN TO ARCHIVE A MODEL OBJ

City.mDuring Instantiatio


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self = [superinit];

if(self) {

... // AFNetworking success block

self.name = JSON[@"name"];

self.state = JSON[@"state"];

self.population = JSON[@"population"];

[CitysaveCity:self];

}

returnself;

}

WHERE AND WHEN TO ARCHIVE A MODEL OBJAppDelegate After editing


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CityViewContr

EditNoteView


PlaceViewController


textFieldShouldReturn:or savePressed:



After editing


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- (BOOL)textFieldShouldReturn:(UITextField *)textField;

}

returnYES;


[textFieldresignFirstResponder];

[CitysaveCity:self.city];


When the app close


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Wait, code runs even when

the app Closes?

UIAPPLICATIONDELEGATE PROTOCOL METHODAppDelegate.h

@interface AppDelegate : UIResponder


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@interface AppDelegate:UIResponder

- (BOOL)application:(UIApplication *)applicationwillFinishLaunchingWithOptions:(NSDictionary *)options

- (BOOL)application:(UIApplication *)application

didFinishLaunchingWithOptions:(NSDictionary *)options

- (void)applicationDidBecomeActive:(UIApplication *)application- (void)applicationWillResignActive:(UIApplication *)application

- (void)applicationDidEnterBackground:(UIApplication *)application

- (void)applicationWillEnterForeground:(UIApplication *)applicatio

APPLICATION LIFECYCLEapplication:willFinishLaunchingWithOpUser taps app

icon for the


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applicationDidBecomeActive:

application:didFinishLaunchingWithOpt

applicationWillResignActive:

applicationDidEnterBackground:

applicationWillEnterForeground:

first time

app visuals appear

app interrupted- call comes in- home button tapped

normal usage

PERFORMING OPERATIONS IN THE APPDELEGAAppDelegate.m

@implementation AppDelegate


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@ p e e a o pp e ega e

- (void)applicationDidEnterBackground:(UIApplication *)applicatio

- (void)applicationWillEnterForeground:(UIApplication *)applicati

}

}

// archive Model

// unarchive Model

Problem: The City Model object is in

CityViewController, not AppDelegate

APP DELEGATE NOTIFICATIONS

UIApplicationDidEnterBackgroundNAppDelegate


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CityViewContr

EditNoteView


PlaceViewController


LISTENING FOR THE APPLICATION CLOSINGCityViewController.m



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addObserver:self

selector:@selector(entering

- (void)entering

Dont forget to re-creat

Model when the app open

Backgroundname:UIApplicationDidEnterBackgroundNotification

object:nil];

}

)

Background {


}

LISTENING FOR THE APPLICATION OPENINGCityViewController.m



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addObserver:self

selector:@selector(entering

- (void)entering

Foreground)name:UIApplicationWillEnterForegroundNotification

object:nil];

}

Foreground {

self.city = [City getCity];

}

WHERE AND WHEN TO UNARCHIVE A MODEL O

In Views that might need a Mo

but dont get a copy of it passe


121/147


PlaceViewController

CityViewContro

EditNoteViewCo

The City model isnt passed,so get it from the archive

CitPlace

WHERE AND WHEN TO UNARCHIVE A MODEL OPlaceTableViewController.h

#import"City.h"


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@property (strong, nonatomic)City *city;



self.city = [City getCity];

}

PLANET HIG SAVING DATA


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124/147

LEVEL 6

PLANET HIG - INTERESTINGPLACESTABLEVIEWCON

AppDelegate


125/147

CityViewContr

EditNoteView


PlaceViewController


Lets get this tableview working

ADDING AN INTERESTINGPLACES NSARRAY @PR

#import

City.h


126/147

@end



- (id)initWithJSON;



@property (strong, nonatomic)NSString*notes;

@property (strong, nonatomic)NSArray* ;interestingPlaces

SETTING THE INITIAL VALUE OF INTERESTINGP

City.m

@implementation City No default interesting plac


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@end

- (id)init { self = [self initWithJSON];

}

- (id)initWithJSON { self = [selfinit];

if(self) { ...

...}

return self;}

= nil;self.interestingPlaces

GETTING THE CITY MODEL INTO PLACEVIEWCON

PlaceViewController.h

#import


128/147


#import

#import"City.h"

@end

@interface PlaceViewController : UIViewController

@property (strong, nonatomic) Place *place;

#import"Place.h"

-(void) (id)sender;makeThisPlaceInteresting:

ADDING A UIBUTTON TO MARK A PLACE AS INTE


-(void)viewWillAppear:(BOOL)animated{


129/147

...

}

UIButton *interestingButton = [UIButtonbuttonWithType:UIButtonTyp

interestingButton.frame = CGRectMake(60,100,200,44);

[interestingButton setTitle:@"Mark as Interesting"forState:UICont

[self.viewaddSubview:interestingButton];

[interestingButton addTarget:self

forControlEvents:UIControlEventTouchUpInside];

action:@selector( )makeThisPlaceInteresting:

self.city = [CitygetCity];

IMPLEMENTING MAKETHISPLACEINTERESTING

NSMutableArray *tempArray = [[NSMutableArray alloc]

-(void) (id)sender{


makeThisPlaceInteresting:


130/147

}


NSMutableArray *tempArray = [[NSMutableArrayalloc]

initWithArray:self.city.interest

[tempArray addObject:self.place];

self.city.interestingPlaces = [[NSArrayalloc] initWithArray:tem

PLACEVIEWCONTROLLER DEM


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INTERESTINGPLACESTABLEVIEWCONTROLLER UITABLEVIEW

InterestingPlacesTableViewController.m




132/147

returnself.city.interestingPlaces.count;

}



}



}

UITABLEVIEW CELLFORROWATINDEXPATH: FROM





133/147




cell.textLabel.text = [self.city.interestingPlaces[indexPath.row

return cell;

}

PUSH A PLACE MODEL INSTANCE WHEN A CELL IS





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[tableView deselectRowAtIndexPath:indexPath animated:YES];

}

PlaceViewController *placeVC = [PlaceViewController alloc] init]

placeVC.place = self.city.interestingPlaces[indexPath.row];

[self.navigationControllerpushViewController:placeVC animated:Y

InterestingPlacesTableViewController Cell PlaceVPlace Model instance passed when cell is tapped

INTERESTINGPLACES

TABLEVIEWCONTROLLER DEMO


135/147

REMOVE THE BUTTON AFTER ADDING A PLACE


- (void)makeThisPlaceInteresting:(id)sender{

sender is the button that called the


136/147

}

self.city = [CitygetCity];

NSMutableArray *tempArray = [[NSMutableArrayalloc]initWithArray:self.city.intere

[tempArray addObject:[[Placealloc] initWithName:self.placeName

description:self.placeDesc

self.city.interestingPlaces = [[NSArrayalloc] initWithArray:te


[sender removeFromSuperview];

SHOW AN ALERT VIEW WHEN MAKING A PLACE INT




137/147

}


...

UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:@"Place favorited"

message:@"This Place is now in your fav

delegate:nil

cancelButtonTitle:@"OK"

otherButtonTitles:nil];

[alert show];

UIALERTVIEW ELEMENTS

UIAlertView *alert = [[UIAlertViewalloc]

initWithTitle:@"Place favorited"

message:@"This Place is now in your favorites


138/147

title messag

cancelButtonTitle

delegate:nil



PROBLEM: THE BUTTON COM


139/147

DONT SHOW THE BUTTON IF THE PLACE IS ALREADY INT



if(![self.city.interestingPlacescontainsObject:self.place]) {


140/147

}

// show the button because this Place isn't interesting ye

} else { // don't show the button because this Place is already int

}

Thats a bummer, man!

DONT SHOW THE BUTTON IF THE PLACE IS ALREADY INT


BOOLplaceAlreadyInteresting = NO;



141/147

for (Place *p in self.city.interestingPlaces) {

}

if([p.nameisEqualToString:self.place.name]) {placeAlreadyInteresting = YES;

}

}

// show the button because this Place isn't interesting ye

} else {

// don't show the button because this Place is already int

}

if( ) {!placeAlreadyInteresting

ACCESSING UITABBARITEMS

tabBarController.tabBa


142/147

badgeitems[0] items[1]

self.tabBarController.tabBar.ite

the Interesting Places tabBarItem

SET THE UITABBARITEM BADGE VALUE

UITabBarItem Property


143/147

Convert the count integer to an NSString

[self.tabBarController.tabBar.items[1]

setBadgeValue:[NSStringstringWithFormat:@

self.city.interestingPlaces

WHERE AND WHEN TO UPDATE SETBADGEVAL

AppDelegateUpdate when the app firs


144/147

CityViewContr

EditNoteView


PlaceViewController


Update inmakeThisPlaceInteresting:

UPDATE THE BADGE WHEN THE APP LAUNCHES

AppDelegate.h

@interface AppDelegate:UIResponder

#import"City.h"


145/147

AppDelegate.m

- (BOOL) application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

}

...

City *city = [CitygetCity];

[tabBarController.tabBar.items[1]

setBadgeValue:[NSStringstringWithFormat:@city.interestingPlaces.coun

if(city) {

}

UPDATE THE BADGE WHEN A PLACE IS MARKED INTERES



...UIAlertView *alert = [[UIAlertViewalloc]


146/147

}


initWithTitle:@"Place favorited"

message:@"This Place is now in your favor

delegate:nil



[alert show];

[self.tabBarController.tabBar.items[1]

setBadgeValue:[NSStringstringWithFormself.city.interestingPl

PLANET HIG


147/147

This thing just keeps

getting better!