当键盘在 Swift 中隐藏时 SCrollView 被禁用

Question

我正在使用以下代码来解决 iOS 中键盘与 UITextField 重叠时的常见问题：

    @IBOutlet var scrollView: UIScrollView!

    var activeField: UITextField?

    override func viewWillAppear(_ animated:Bool) {
    super.viewWillAppear(animated)

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
}

---

    func textFieldDidBeginEditing(_ textField: UITextField) {

    activeField = textField
}

func textFieldDidEndEditing(_ textField: UITextField) {

    activeField = nil
}

键盘通知

    func keyboardWillHide(_ notification: Notification) {

    var info = notification.userInfo!
    let keyboardSize = info[UIKeyboardFrameEndUserInfoKey] as? CGRect
    let contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, -keyboardSize!.height , 0.0)
    scrollView.contentInset = contentInsets
}

func keyboardWillShow(_ notification: Notification) {
    var info = notification.userInfo!
    let keyboardSize = info[UIKeyboardFrameEndUserInfoKey] as? CGRect
    let contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height + 8, 0.0)
    scrollView.contentInset = contentInsets
}

它就像魔法一样。

但我面临以下问题。当键盘在文本编辑后隐藏时，视图会回到之前的状态，应该是这样的，但是滚动被禁用。我不知道为什么..我设置了scrollView.isScrollEnabled = true，但这并没有解决我的问题。

我怎样才能摆脱这个？

Answer 1

这一行是错误的（好吧，整个事情都是错误的，但这是你抱怨的那一行）：

let contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, -keyboardSize!.height, 0.0)

会更好

let contentInsets: UIEdgeInsets = .zero

更好的是，当键盘显示时，保存内容插图。当它隐藏时，将它们恢复为您保存的值。