Question

我有表格视图，下面有文字视图。我在键盘上方添加了一个工具栏，以显示“完成”按钮。当我点击一行中的按钮以删除该行时，它显示LayoutConstraints问题，如下所示。接下来的日志还显示了事件的流向。

我可以确认此问题与工具栏有关，如果我删除工具栏，则不会出现此问题。

在https://github.com/hackiftekhar/IQKeyboardManager/issues/1616上讨论了类似的问题我从那里尝试过一些建议。

对文本视图禁用自动更正->不适用于我
使用此代码创建对我不起作用的工具栏

let toolBar = UIToolbar（frame：CGRect（origin：.zero，size：CGSize（width：UIScreen.main.bounds.size.width，height：44.0）））

任何解决方法？

textViewShouldBeginEditing
textViewDidBeginEditing
deleteButtonTapped
textViewDidEndEditing
textViewShouldBeginEditing
[LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want.
    Try this:
        (1) look at each constraint and try to figure out which you don't expect;
        (2) find the code that added the unwanted constraint or constraints and fix it.
(
    "<NSLayoutConstraint:0x280c45f90 'accessoryView.bottom' _UIRemoteKeyboardPlaceholderView:0x10df221b0.bottom == _UIKBCompatInputView:0x10f819ff0.top   (active)>",
    "<NSLayoutConstraint:0x280c66cb0 'assistantHeight' TUISystemInputAssistantView:0x10aa64390.height == 45   (active)>",
    "<NSLayoutConstraint:0x280c44500 'assistantView.bottom' TUISystemInputAssistantView:0x10aa64390.bottom == _UIKBCompatInputView:0x10f819ff0.top   (active)>",
    "<NSLayoutConstraint:0x280c444b0 'assistantView.top' V:[_UIRemoteKeyboardPlaceholderView:0x10df221b0]-(0)-[TUISystemInputAssistantView:0x10aa64390]   (active)>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x280c444b0 'assistantView.top' V:[_UIRemoteKeyboardPlaceholderView:0x10df221b0]-(0)-[TUISystemInputAssistantView:0x10aa64390]   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
textViewDidBeginEditing
textViewDidEndEditing

添加完成按钮的代码。

override func viewDidLoad() {
    super.viewDidLoad()
    //...

    self.textView.addDoneButton(title: "Done", target: self, selector: #selector(tapDone(sender:)))
}

extension UITextView {

    // Add done button above keyboard
    func addDoneButton(title: String, target: Any, selector: Selector) {

        let toolBar = UIToolbar(frame: CGRect(x: 0.0,
                                              y: 0.0,
                                              width: UIScreen.main.bounds.size.width,
                                              height: 44.0))
        toolBar.backgroundColor = .toolBarBackground
        let flexible = UIBarButtonItem(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
        let barButton = UIBarButtonItem(title: title, style: .plain, target: target, action: selector)
        barButton.setTitleTextAttributes([NSAttributedString.Key.font : UIFont.bodyBold, NSAttributedString.Key.foregroundColor : UIColor.purpleColour], for: [])
        toolBar.setItems([flexible, barButton], animated: false)
        self.inputAccessoryView = toolBar
    }
}

Answer 1

这是Apple的错误，而不是您的错误。忽略它。这是一个普遍的“问题”，但无可奈何。没有发现视觉伤害。这只是一个令人讨厌的控制台转储。

使用键盘和UIToolBar无法同时满足约束

1 个答案: