Settings.bundle的DefaultValue不起作用？(NSUserDefaults)

第一次需要用iPhone系统配置，发现Settings.bundle/Rool.plist中的DefaultValue不起作用。返回是nil。Google了下，NSUserDefaults确实没有提供现成的方法去让DefaultValue生效。解决办法如下：

在程序的- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{}中检测设置的项值，如果为nil就全部设为DefaultValue的值：

 

  
    

   
     
   
     //
   
      [YourApp]AppDelegate.m
   
     

   
     -
   
      (BOOL)application:(UIApplication 
   
     *
   
     )application 
didFinishLaunchingWithOptions:(NSDictionary 
   
     *
   
     )launchOptions { 
 
 NSString 
   
     *
   
     name 
   
     =
   
      [[NSUserDefaults standardUserDefaults] 
 stringForKey:
   
     @"
   
     name_preference
   
     "
   
     ];
 
   
     if
   
     (
   
     !
   
     name) {
 
   
     //
   
      加载默认配置
   
     

   
      [self performSelector:@selector(registerDefaultsFromSettingsBundle)]; 
 }
 
 [window addSubview:viewController.view];
 [window makeKeyAndVisible];
 
 
   
     return
   
      YES;
}

   
     //
   
      获取默认设置
   
     

   
     -
   
      (
   
     void
   
     )registerDefaultsFromSettingsBundle {
 NSString 
   
     *
   
     settingsBundle 
   
     =
   
      [[NSBundle mainBundle] pathForResource:
   
     @"
   
     Settings
   
     "
   
      ofType:
   
     @"
   
     bundle
   
     "
   
     ];
 
   
     if
   
     (
   
     !
   
     settingsBundle) {
 NSLog(
   
     @"
   
     Could not find Settings.bundle
   
     "
   
     );
 
   
     return
   
     ;
 }
 
 NSDictionary 
   
     *
   
     settings 
   
     =
   
      [NSDictionary dictionaryWithContentsOfFile:[settingsBundle stringByAppendingPathComponent:
   
     @"
   
     Root.plist
   
     "
   
     ]];
 NSArray 
   
     *
   
     preferences 
   
     =
   
      [settings objectForKey:
   
     @"
   
     PreferenceSpecifiers
   
     "
   
     ];
 
 NSMutableDictionary 
   
     *
   
     defaultsToRegister 
   
     =
   
      [[NSMutableDictionary alloc] initWithCapacity:[preferences count]];
 
   
     for
   
     (NSDictionary 
   
     *
   
     prefSpecification 
   
     in
   
      preferences) {
 NSString 
   
     *
   
     key 
   
     =
   
      [prefSpecification objectForKey:
   
     @"
   
     Key
   
     "
   
     ];
 
   
     if
   
     (key) {
 [defaultsToRegister setObject:[prefSpecification objectForKey:
   
     @"
   
     DefaultValue
   
     "
   
     ] forKey:key];
 }
 }
 [[NSUserDefaults standardUserDefaults] registerDefaults:defaultsToRegister];
 [defaultsToRegister release];
}
  
    

 

 

Download DefaultSettingsDemo

 

Ref:http://stackoverflow.com/questions/510216/can-you-make-the-settings-in-settings-bundle-default-even-if-you-dont-open-the-s