Question

我已经确定,

这是我下面在应用中确定的方法。

NSString *string4 = @"Objective-C";

NSUserDefaults* defs7 = [NSUserDefaults standardUserDefaults];
[defs7 setObject:string4 forKey:@"subject_textfield"];

下面是应用有限发射方法中的我。

NSUserDefaults* defs7 = [NSUserDefaults standardUserDefaults];
subject_textfield.text = [defs7 stringForKey:@"subject_textfield"];

but,when i press home and then i again launch application at that time i m getting nil value for subject_textfield.text.

为什么如此?

Answer 1

使用<代码>[NSUserDefaults standardUserDefaults]的同步];以强制实施NSUserDefaults正在得到拯救。

参考:

Because this method is automatically invoked at periodic intervals, use this method only if you cannot wait for the automatic synchronization (for example, if your application is about to exit) or if you want to update the user defaults to what is on disk even though you have not made any changes.

Answer 2

http://www.un.org/Depts/DGACM/index_french.htm 不得在<代码>iOS4上打电话。如果你在SOS4,检查下列事件:

didFinishLaunchingWithOptions
applicationWillResignActive

applicationWillEnterForeground
applicationDidBecomeActive

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