NSNotificationCenter 的使用
一般在 add
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- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil；
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- (id) initWithCoder:(NSCoder *)aDecoder；
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- (id) init;?
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在
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- (void) dealloc；中 remove
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传说：
Important:?The notification center does not retain its observers, therefore, you must ensure that you unregister observers (using removeObserver: or removeObserver:name:object:) before they are deallocated. (If you don't, you will generate a runtime error if the center sends a message to a freed object.)
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但是没发现崩溃的问题
