//註冊鍵盤出現的通知

    [[NSNotificationCenterdefaultCenter] addObserver:self

selector:@selector(keyboardWasShown:)

name:UIKeyboardWillShowNotificationobject:nil];

//註冊鍵盤消失的通知

    [[NSNotificationCenterdefaultCenter] addObserver:self

selector:@selector(keyboardWillBeHidden:)

name:UIKeyboardWillHideNotification

- (void)keyboardWasShown:(NSNotification*)aNotification

{

//鍵盤高度

CGRect keyBoardFrame = [[[aNotification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

}

-(void)keyboardWillBeHidden:(NSNotification*)aNotification

{