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Presentation for Tokyo iOS Developers meetup about localization. Topics include: Localizing text with NSLocalizedString() and genstrings, localizing images, localizing storyboards and nibs with ibtool.
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Localizing iOS Apps
Anthony Weissweissazool.com
anthony@weissazool.com
Friday, November 9, 12
Why localize?
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You make more money.
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Fixed cost of translationvs.
Unlimited potential upside
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Time investment:Minimal.
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How to prepare your app for localization:
NSLocalizedString(key, comment)
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labelExample.text = ! NSLocalizedString(@"NSLocalizedString() example", ! ! ! ! ! ! ! ! ! @"Translate 'example' only");
if (papayas == 0) { papayaPlurality = NSLocalizedString(@"NoPapayas", ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! @"No papayas."); additionalComment = NSLocalizedString(@"How sad.", ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! @"Regretfulness");}return [NSString stringWithFormat:! ! ! ! NSLocalizedString(@"You have %d %@. %@", ! ! ! ! ! ! ! ! ! ! ! ! @"Papaya possession"), ! ! ! ! papayas, papayaPlurality, additionalComment];
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Comments can give your translators
context.
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Everything’s in NSLocalizedString().
Now what?The genstrings command-line tool.
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What’s genstrings?genstrings searches your code for macros related to
localization, including NSLocalizedString().
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genstrings en.lprojgenstrings -o target-directory source-filesgenstrings -o target-directory other-source-files -a
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/* Translate 'example' only */"NSLocalizedString() example" = ! ! ! ! ! ! ! ! ! ! "NSLocalizedString() example";
/* No papayas. */"NoPapayas" = "papayas";
/* Regretfulness */"How sad." = "How sad.";
/* Papaya possession */"You have %d %@. %@" = "You have %1$d %2$@. %3$@";
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/* Translate 'example' only */"NSLocalizedString() example" = "Ejemplo de ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! NSLocalizedString()";
/* No papayas. */"NoPapayas" = "papayas";
/* Regretfulness */"How sad." = "Que lástima. ";
/* Papaya possession */"You have %d %@. %@" = "%3$@Usted tiene %1$d %2$@.";
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/* Papaya possession */"You have %d %@. %@" = "You have %1$d %2$@. %3$@";
/* Papaya possession */"You have %d %@. %@" = "%3$@Usted tiene %1$d %2$@.";
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How does NSLocalizedString() work?
It’s dictionaries all the way down.
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NSLocalizedStringFromTable(key, table, comment)
Looks up your string in table.strings
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Adding localizations to your project
Let’s localizing!
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I’ve got images with English text in them.
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en.lproj/aybabtu.png
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en.lproj/aybabtu.png
ja.lproj/aybabtu.png
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en.lproj/aybabtu.png
ja.lproj/aybabtu.png
es.lproj/aybabtu.png
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I like Interface Builder. I don’t want to set my UI
text in code.
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ibtoolibtool --generate-strings-file MainStoryboard.strings
MainStoryboard.storyboard
ibtool --generate-strings-file NibName.strings NibName.xib
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/* Class = "IBUILabel"; text = "This text has been laid out in the nib."; ObjectID = "3ZM-yV-HpI"; */"3ZM-yV-HpI.text" = "This text has been laid out ! ! ! ! ! ! ! ! ! ! ! in the nib.";
/* Class = "IBUILabel"; text = "Just the way I like it!"; ObjectID = "Oxg-9T-bKW"; */"Oxg-9T-bKW.text" = "Just the way I like it!";
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ibtool --strings-file es.lproj/MainStoryboard.strings --write es.lproj/MainStoryboard.storyboard en.lproj/MainStoryboard.storyboard
ibtool --strings-file target-language/NibName.strings --write target-language/NibName.xib base-language/NibName.xib
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Money, revisited.
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• Cost of translation: ¥8,000
• Revenue per sale: ¥60
• Sell 8000/60 = 135 extra apps in that language to break even.
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Which you need to leverage with sales and marketing.
Localization gives you a competitive advantage.
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Additional Resources
• https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/LoadingResources/Strings/Strings.html
• https://developer.apple.com/library/ios/#documentation/MacOSX/Conceptual/BPInternational/Articles/LocalizingInterfaces.html
• http://gengo.com/contact-support/quality-policy/
• http://kb.applingua.com/2011/10/3rd-party-localization-string-extraction-tools/
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WZLocalize
github.com/weissazool/WZLocalize
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