Question

我有一个用键盘移动屏幕底部的UIButton的功能。问题是，当用户按下一个键（开始在文本字段中写入）时，按钮会返回。

我尝试设置addBtn.translatesAutoresizingMaskIntoConstraints = true

仅当我的Xcode将main.storyboard设置为模拟器时才有效，否则会破坏约束。起初我认为这只是一个Xcode 9错误，但后来我在iTunes Connect上传了一个包，并要求我的女朋友通过TestFlight下载应用程序，实际上在设置translatesAutoresizingMaskIntoConstraints = true

时，约束被搞砸了

func bindToKeyboard () {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame , object: nil)
}

@objc func keyboardWillChange(_ notification : NSNotification) {
    let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
    let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
    let startingFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
    let endingFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue

    let deltaY = endingFrame.origin.y - startingFrame.origin.y

    UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {self.frame.origin.y += deltaY
    },completion: nil)
}

Answer 1

好的，所以经过3个小时与这个bug的斗争后，我禁用了autoresizingmasks，并为底部约束创建了 outlet 。

在每个动画之后，我使用 deltaY

更新了该约束

所以我的代码现在看起来像这样

func bindToKeyboard () {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame , object: nil)
}

@objc func keyboardWillChange(_ notification : NSNotification) {
    let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
    let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
    let startingFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
    let endingFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue

    let deltaY = endingFrame.origin.y - startingFrame.origin.y

    UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {self.frame.origin.y += deltaY
    },completion: nil)


    btc.constant -= deltaY
}

周六晚上多么愉快！我喜欢编程！

UIButton随键盘一起移动。当用户按下键时位置重置

1 个答案: