删除NSNotificationCenter观察者

Question

我加入这个代码在viewDidLoad中检测键盘的显示/隐藏：

[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(keyboardDidHide:) 
              name:UIKeyboardDidHideNotification 
              object:nil]; 

[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(keyboardWillShow:) 
              name:UIKeyboardWillShowNotification 
              object:nil]; 

在某些时候，虽然我想删除这些观察员，而不调用

[[NSNotificationCenter defaultCenter] removeObserver:self]; 

，因为这会删除所有观察者，并且我有其他观察员不希望被删除。我怎样才能删除这两个？

Answer 1

[[NSNotificationCenter defaultCenter] removeObserver:self 
               name:UIKeyboardDidHideNotification 
               object:nil]; 

[[NSNotificationCenter defaultCenter] removeObserver:self 
               name:UIKeyboardWillShowNotification 
               object:nil]; 

Answer 2

使用的的removeObserver:name:object:方法如所描述的in the official documentation，以除去观察者用于特定通知名称。

Answer 3

使用[[NsNotificationCenter defaultCenter] removeObserver:self name: UIKeyboardWillShowNotification object:nil]