UIKeyboardWillShowNotification 中的条形按钮项目动画答案

【问题标题】：Bar button items animating in UIKeyboardWillShowNotificationUIKeyboardWillShowNotification 中的条形按钮项目动画
【发布时间】：2016-02-05 00:30:39
【问题描述】：

我不知道出了什么问题。我在导航栏中有 2 个右键，当键盘打开时我想要 A 和 B 按钮，当键盘关闭时，A 和 C，或者可能只是 C。我这样做了。我使用 UIKeyboardWillShowNotification 来检查键盘何时打开或关闭。

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)

它工作正常。问题是当我调用“KeyboardWillShow”和“KeyboardWillHide”方法时，右边的按钮会飞进来。见这里：GIF

 func keyboardWillShow(sender: NSNotification) {
    if let userInfo = sender.userInfo {
        if let keyboardHeight = userInfo[UIKeyboardFrameEndUserInfoKey]?.CGRectValue.size.height {
            textViewBottomConstraint.constant = keyboardHeight
            print("keyboard is shown")

            self.navigationItem.rightBarButtonItems = nil
            let rightButtons : NSArray = [self.keyboardRightButton, self.cameraRightButton]
            self.navigationItem.setRightBarButtonItems(rightButtons as? [UIBarButtonItem], animated: true)

            UIView.animateWithDuration(0.1, animations: { () -> Void in
                self.view.layoutIfNeeded()

            })
        }
    }


}

我试过这个，它工作正常，但只有在关闭键盘时。

func dismissKeyboard()
{

    composeTextView.resignFirstResponder()

    self.navigationItem.rightBarButtonItems = nil
    self.navigationItem.setRightBarButtonItem(settingsRightButton, animated: false)

【问题讨论】：

标签： ios swift rightbarbuttonitem

【解决方案1】：

解决方法：

    func textViewShouldBeginEditing(textView: UITextView) -> Bool
{

    self.navigationItem.rightBarButtonItems = nil
    let rightButtons : NSArray = [self.keyboardRightButton, self.cameraRightButton]
    self.navigationItem.setRightBarButtonItems(rightButtons as? [UIBarButtonItem], animated: true)

    return true
}

谢谢

【讨论】：