iOS 12上的scrollView.contentInset之后，scrollView.setContentOffset不起作用

Question

我有带有带有两个textFields和两个按钮的scrollView和bottomContainerView的屏幕。我想在显示键盘时将scrollView滚动到底部。这就是为什么我首先设置scrollView.contentOffset，然后尝试使forgetButton的框架可见（将所有视图滚动到底部）的原因。并且在iOS 11.4中可以正常工作。但是在iOS 12中却没有。

private func adjustInsetForKeyboardShow(_ show: Bool, notification: Notification) {
    let userInfo = notification.userInfo ?? [:]
    if let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        let adjustmentHeight = (keyboardFrame.height + 24) * (show ? 1 : 0)
        scrollView.contentInset.bottom = adjustmentHeight
        scrollView.scrollIndicatorInsets.bottom = adjustmentHeight

        // set offset
        let top = bottomContainerView.frame.minY + forgetButton.frame.minY
        let height = forgetButton.frame.height
        scrollView.scrollRectToVisible(CGRect(x: 0, y: top, width: 1, height: height), animated: true)

    }
}

@objc
private func keyboardWillShow(_ notification: Notification) {
    adjustInsetForKeyboardShow(true, notification: notification)
}

@objc
private func keyboardWillHide(_ notification: Notification) {
    adjustInsetForKeyboardShow(false, notification: notification)
}

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: Notification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: Notification.Name.UIKeyboardWillHide, object: nil)
}

iOS 11.4

iOS 12.0

Answer 1

您可以尝试更改此部分：

let userInfo = notification.userInfo!
let keyboardFrame = info[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect

或者：在View的底部创建一个约束，然后在打开键盘时向其添加键盘的高度尺寸（keyboardFrame.height），并使用动画更新约束

 UIView.animate(withDuration: 0.3) {
  self.view.layoutIfNeeded()
 }

致谢