ios - Do I need to do registerDefaults: every time the app starts? -

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I am developing an iOS app with the latest SDK.

I do this: 

  - (BOOL) Application: (UIApplication *) Application FinishLaunchingWithOptions: (NSDictionary *) Launch Option {NSUserDefaults * standardUserDefaults = [NSUserDefaults StandardUserDefaults ]; [Standard user defaults register defaults: [preferred default value dictionary]]; [Synchronize standard user defaults]; Yes come back }   
  What is the need to register Defaults: Every time the app starts?    
 
 
 Yes, documents for registerDefaults:  explicitly Explains:  
 
 The contents of the registration domain are not written to disk; You need to call this method every time your application starts.   
 Note that there is no need to call  registerDefaults after  register  for the same reason .

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