当包含UITextView的inputAccessoryView显示键盘时，iOS UITableView内容会出现UINavigationBar奇怪的错误

我在使用此代码时体验到了与您相同的行为.肯定有什么东西把顶级安全区域指南搞糊涂了.

我完全放弃了这个inputAccessoryView模式，从而解决了这个问题.我只是

• 将表视图的底部锚点设置为此底部视图的顶部锚点；以及
• 将底视图的底锚设置为主视图的keyboardLayoutGuide.topAnchor.

这样做之后，你就可以享受"保持文本视图在键盘上方"的功能，而不会有这种特殊的导航栏行为/错误.

这种方法还可以自动调整表视图滚动区域，这样即使出现键盘，您仍然可以滚动到底部.它也是一种零码解决方案.

FWIW, if doing this in IB, you may have to select the main view and explicitly enable the keyboard layout guides:

在iOS 15之前的iOS版本中，我们过go 必须添加键盘观察器.因此，我们将为SuperView的底部约束添加一个@IBOutlet，然后手动更改该底部约束(在演示和取消键盘的同时为其设置动画).例如，在我的iOS 15之前的项目中，我做了一些类似的事情:

@IBOutlet weak var bottomConstraint: NSLayoutConstraint!
private var keyboardWillShowObserver: NSObjectProtocol?
private var keyboardWillHideObserver: NSObjectProtocol?

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    addKeyboardObservers()
}

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    removeKeyboardObservers()
}

有:

private extension ViewController {
    func addKeyboardObservers() {
        keyboardWillShowObserver = NotificationCenter.default.addObserver(
            forName: UIApplication.keyboardWillShowNotification,
            object: nil,
            queue: .main
        ) { [weak self] notification in
            guard let self else { return }
            showKeyboard(bottom: bottomConstraint, notification: notification)
        }

        keyboardWillHideObserver = NotificationCenter.default.addObserver(
            forName: UIApplication.keyboardWillHideNotification,
            object: nil,
            queue: .main
        ) { [weak self] notification in
            guard let self else { return }
            hideKeyboard(bottom: bottomConstraint, notification: notification)
        }
    }

    func removeKeyboardObservers() {
        if let keyboardWillShowObserver {
            NotificationCenter.default.removeObserver(keyboardWillShowObserver)
        }

        if let keyboardWillHideObserver {
            NotificationCenter.default.removeObserver(keyboardWillHideObserver)
        }
    }
}

它使用这个UIViewController扩展名:

//  UIViewController+KeyboardChange.swift

import UIKit

extension UIViewController {
    func showKeyboard(bottom constraint: NSLayoutConstraint, notification: Notification) {
        animateAlongsideKeyboardChange(notification) { [self] frame in
            constraint.constant = view.bounds.height - frame.minY
            view.layoutIfNeeded()
        }
    }

    func hideKeyboard(bottom constraint: NSLayoutConstraint, notification: Notification) {
        animateAlongsideKeyboardChange(notification) { [self] _ in
            constraint.constant = 0
            view.layoutIfNeeded()
        }
    }

    private func animateAlongsideKeyboardChange(_ notification: Notification, animation: @escaping (CGRect) -> Void) {
        let userInfo = notification.userInfo!
        guard
            var keyboardFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
            let curve = (userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber).flatMap({
                return UIView.AnimationCurve(rawValue: $0.intValue)
            }),
            let duration = userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber as? CGFloat
        else {
            return
        }

        keyboardFrame = view.convert(keyboardFrame, from: nil)

        UIViewPropertyAnimator(duration: duration, curve: curve) {
            animation(keyboardFrame)
        }.startAnimation()
    }
}

这一切都有点麻烦，这就是iOS 15键盘布局指南如此受欢迎的原因.但在早期的iOS版本中，我们会手动观察键盘的显示和取消.