未调用UIKeyboard通知

Question

我正在运行ios8b4，并且我有一些注册键盘通知的代码可以为我的视图设置动画。

Class KeyboardAdjuster

- (void)registerForKeyboardNotifications {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)unregisterForKeyboardNotifications {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

在视图控制器的外观方法中调用它们。 self.keyboardAdjuster不是nil（已验证），我可以进入注册方法，这两个通知应该注册。在视图控制器消失之前，没有调用取消注册。

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.keyboardAdjuster registerForKeyboardNotifications];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(searchEvent:) name:[SCWebSearchEvent identifier] object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:[SCWebSearchEvent identifier] object:nil];
    self.navigationController.navigationBar.translucent = NO;
    [self.keyboardAdjuster unregisterForKeyboardNotifications];
    [super viewWillDisappear:animated];
}

此外，每当调用textview或textfield时，我的选择器都会在iOS模拟器中被完美调用，但出于某种原因，在我的设备上运行时，它们永远不会被调用。在设备和模拟器上运行时还有什么我需要做的吗？