ios上捕捉鍵盤彈出hide事件

#define _UIKeyboardFrameEndUserInfoKey (&UIKeyboardFrameEndUserInfoKey != NULL ? UIKeyboardFrameEndUserInfoKey : @"UIKeyboardBoundsUserInfoKey")

在viewWIllAppear的時候添加通知觀察者和事件。

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

-(void)viewWillDisappear:(BOOL)animated{    [[NSNotificationCenter defaultCenter] removeObserver:self];}

在willDisappear 的時候remove掉觀察者。

這裡處理你要進行的處理，比如鍵盤擋住了你的登陸框或者其他的。

- (void)keyboardWillShow:(NSNotification*)notification{//    _keyboardRect = [[[notification userInfo] objectForKey:_UIKeyboardFrameEndUserInfoKey] CGRectValue];}- (void)keyboardWillHide:(NSNotification*)notification{//    _keyboardRect = [[[notification userInfo] objectForKey:_UIKeyboardFrameEndUserInfoKey] CGRectValue];}