IOS study notes 7-program internationalization (local multi-language)

How can I internationalize an iPhone project? Is it necessary to write a source code in English and a source code in Chinese for the same project?

Actually, this is not necessary. We can use the iPhone multi-language support to implement local (international) projects.

1. Create a Windows-base Application. Open the main. m file and add the following code to the main function:

// Obtain the default user information

NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];

// Obtain all language settings supported by the iPhone

NSArray * ages = [defaults objectForKey: @ "AppleLanguages"];

NSLog (@ "% @", ages );

Run the program and output the following content from the console:

"Zh-Hans ",

En,

Fr,

De,

"Zh-Hant ",

......

We can see that all languages supported on the iPhone are English, French, and German, and there are two languages starting with "zh" (simplified/traditional ). We know that Chinese characters start with "zh.

2. Right-click Resources, Add a New File, select Resource> Strings File for the File type, and the File name is Localizable. strings. Use the getInfo command on the File and click Make File Localizable in the following interface:

 

 

Then, you can go to the Finder to view the project directory. You will find an additional English. lproj directory with a Localizable. strings file under it (but the content is empty ).

Open the getInfo window again and the following page is displayed:

 

We can see that there is only one language in the Localizations list. We need to click the Add Localization button to Add the Chinese zh_CN:

 

 

In this case, you can go to the Finder to check the project directory and find another directory named zh_CN.lproj. There is also a Localizable. strings file under it (the content is empty ).

At the same time, there are two more Localizabel. strings files (one English and one zh_CN) in the Copy Bundle Resources directory under Target ):

 

 

3. Open MainWindow. xib and drag a UILable to the window.

4. Open the AppDelegate. h file, declare the UILable variable in it, and add an IBOutlet:

UILabel * label;

......

@ Property (nonatomic, retain) IBOutlet UILabel * label;

5. Open the AppDelegate. m file,

@ Synthesize window, label;

Add the code in (BOOL) applicationv: application didfinishlaunchingwitexceptionsv: method:

// Use the NSLocalizedString function to obtain the internationalized String Based on the iPhone's multilingual settings

Label. text = NSLocalizedString (@ "Localizable Test ",@"");

6. Return to IB and connect the UILable control with the IBOutlet variable label:

 

 

7. Open the terminal program, enter the project directory, and run the following command:

Genstrings-o English. lproj./classes/*. m

You will find a line of code added to the Localizable. strings file under the English. lproj directory:

"Localizable Test" = "Localizable Test ";

Run the following command:

Genstrings-o zh_CN.lproj./classes/*. m

Similarly, a line of code will be added to the Localizable. strings file under the zh_CN.lproj directory:

"Localizable Test" = "Localizable Test ";

Open Localizable. strings in the zh_CN.lproj directory (double-click) and change it

"Localizable Test" = "localization Test ";

In this way, whenever the source code changes, we need to use the genstrings command to re-generate the Localizable. strings file. However, after each re-generation, the original editing (translation) results are lost, and we must re-translate them. This is a big headache. We recommend that you back up the files before each genstrings operation to reduce repetitive work.

8. Run the program. The effect is as follows (if the multi-language of the simulator is set to simplified Chinese ):

 

When you change the multilingual settings to English, the text in the label is displayed as English.