Open the TextEdit application (/Applications/TextEdit), and take a look at its user interface.

Close TextEdit, and open the System Preferences application. Select the International preferences panel.

Reorder your preferred language order by dragging Français to the top of the list, as shown in Figure 14-1.

Figure 14-1. Changing language preferences

Open TextEdit again, and notice how the menu items are now in French rather than English, as shown in Figure 14-2.

Figure 14-2. TextEdit running in French

Quit TextEdit (File → Quit, or

-Q), and then reset your language preferences to English.

Use the Finder to locate the Clock application (/Applications/Clock).

Control-click on the Clock application icon, and select Show Package Contents from the pop-up menu.

Select View → List from the Finder menus, browse through the application as shown in Figure 14-3, and notice the files shown.

Figure 14-3. Localized resources in the Clock application bundle

Create a new Cocoa Application project in Project Builder (File → New Project → Application → Cocoa Application) named “Localization”, and save it in your ~/LearningCocoa folder.

Open the MainMenu.nib file in Interface Builder by double-clicking on its icon in the Resources folder of the Groups & Files pane in Project Builder.

Using the various controls available on Interface Builder’s palettes, lay out an interface that looks like Figure 14-4.

Figure 14-4. Our Localization application’s interface

Create a subclass of NSObject. Click on the Classes tab of the MainMenu.nib window, find NSObject, Control-click it, and select Subclass NSObject from the pop-up menu; name the subclass Controller.

Create an outlet named statusField on the Controller object, using the Info window (Tools → Show Info, or Shift-

-I).

Create an action for the Controller subclass, named submit:.

Create the files for the Controller subclass (Classes → Create Files for Controller).

Instantiate the Controller subclass (Classes → Instantiate Controller).

Control-drag a connection between the Controller object and the Not Submitted text field, and connect it to the statusField outlet in the Info window.

Connect the Submit button to the submit: method of the Controller by Control-dragging a connection from the Submit button to the Controller object.

Save the nib file (

-S), close the MainMenu.nib window in Interface Builder, and then return to Project Builder.

In Project Builder’s Groups & Files panel, click the disclosure triangle beside the MainMenu.nib file, and select the English entry underneath it, as shown in Figure 14-5.

Figure 14-5. Looking at the single localization of the MainMenu.nib file

Bring up the Info panel (Project → Show Info, or

-I).

Select Add Localized Variant from the Localization & Platforms pop-up menu. You will be prompted for a locale. Enter French, as shown in Figure 14-6.

Figure 14-6. Adding a French localization of the MainMenu.nib file

Close the Info window by clicking on the red close window button.

You should see two localizations of the MainMenu.nib file in Project Builder.

Double-click the French variant to open it in Interface Builder.

Modify the various strings in the interface to match Figure 14-7. To type in the ç character, type Option-e, then e again (without the Option key). Notice that you’ll have to resize the window and move things around to accommodate the longer text fields.

Figure 14-7. Our interface in French

Save the nib file (

-S), and return to Project Builder.

Build and run the application (

-R) to verify that everything works.

Quit the application (

-Q).

Launch the System Preferences application in the Dock, and click on the International button to open its preferences panel.

Change your language preferences from English to Français by clicking on Français and dragging it to the top of the list in the Languages window.

Run the application again to see the French interface run.

Quit and return to the System Preferences; reset your preferred language to English by dragging it to the top of the list.

Add a new file, named Localizable.strings, to the project in Project Builder (File → New File → Empty File). Save it to the ~/LearningCocoa/Localization/English.lproj folder. Make sure that it is in the Resources group, as shown in Figure 14-8.

Figure 14-8. Adding a Localizable.strings file

Edit the new file to have the following text:

                     
"Not Submitted" = "Not Submitted";
                     
"Accepted" = "Accepted";

Bring up the Info panel (Project → Show Info, or

-I).

Select Add Localized Variant from the Localization & Platforms pop-up menu. You will be prompted for a localization. Enter French, and then close the Info window.

Click on the disclosure triangle next to the Localizable.strings file. Beneath that, you will see two files: English, which we created in steps 1 and 2; and French, which we created in the previous step.

Edit the French variant of the file to match the following text:

                     
"Not Submitted" = "Non soumis";
                     
"Accepted" = "Admis";

Edit the submit: method of the Controller.m file.

- (IBAction)submit:(id)sender
{
    [statusField setStringValue:NSLocalizedString(@"Accepted", nil)];
}

This code sets the value of our status field to the localized form of the Accepted string.

Save the project (File → Save, or

-S).

Build and run (

-R) the application. Test out the Submit button, and make sure that the status field changes.

Quit the application, and set Français as your preferred language using System Preferences.

Run the application again to see the French interface run. Click the Submit button.

Quit and return your preferred language to English.

Localize the Currency Converter project from Chapter 5 into the language of your choice. Use the Translation channel of Sherlock 3 if you need help translating the strings.