键盘KVC通知

1 、键盘落下通知

 [[NSNotificationCenterdefaultCenter]addObserverForName:UIKeyboardWillHideNotificationobject:nilqueue:[NSOperationQueuemainQueue]usingBlock:^(NSNotification *note) {}

1 、键盘开启通知

 [[NSNotificationCenterdefaultCenter]addObserverForName:UIKeyboardWillShowNotificationobject:nilqueue:[NSOperationQueuemainQueue]usingBlock:^(NSNotification *note) {}

删除通知

- (void)dealloc {

    [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillHideNotificationobject:nil];

    [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];

}