有时候需要监听NSUserDefaults值时时变化！发现这个方法挺方便记录一下
NSNotificationCenter *center = [NSNotificationCenter defaultCenter]; [center addObserver:self selector:@selector(defaultsChanged:) name:NSUserDefaultsDidChangeNotification object:nil];
- (void)defaultsChanged:(NSNotification *)notification { // Get the user defaults NSUserDefaults *defaults = (NSUserDefaults *)[notification object]; // Do something with it NSLog(@"%@", [defaults objectForKey:@"nameOfThingIAmInterestedIn"]);}
地址：http://stackoverflow.com/questions/3166563/how-to-receive-nsuserdefaultsdidchangenotification-iphone
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