swift 2 0 监听键盘

   //要出现
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil)  
   //要隐藏
     NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil)  
    //出现
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardDidShow:"), name:UIKeyboardDidShowNotification, object: nil)  
   ///隐藏
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardDidHide:"), name:UIKeyboardDidHideNotification, object: nil)  

   ///获取键盘高度。 动画速度是0.25秒
   let height : CGFloat = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey])!.CGRectValue.size.height

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