ios - UIButton 随键盘一起移动。当用户按下一个键时位置重置

Question

我有一个功能，可以使用键盘移动屏幕底部的 UIButton。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


这仅在我的 Xcode 将 main.storyboard 设置为模拟器时有效，否则它会破坏约束。起初我以为这只是 Xcode 9 的一个错误，但后来我在 iTunes Connect 上上传了一个 bundle ，并让我的女朋友通过 TestFlight 下载该应用程序，实际上在设置 translatesAutoresizingMaskIntoConstraints = true

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

好吧，在与这个错误斗争了 3 个小时之后，我禁用了自动调整大小掩码，并为底部约束 创建了一个导出。

在每个动画之后我用 deltaY 更新了那个约束

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
}

多么愉快的周六晚上啊!我喜欢编程!