Question

我试图获得类似于Facebook使用的设置（如果他们使用UITextView）。我希望自动检测链接，但我不希望UITextView中的任何其他文本可选。因此，用户可以单击链接但无法选择任何其他文本。

尽管四处搜寻，我还没有找到解决方案，因为链接选择工作需要整个文本视图可供选择。

Answer 1

如果您的最低部署目标是iOS 11.2或更高版本

您可以通过继承UITextView并禁止可以选择内容的手势来禁用文本选择。

以下解决方案是：

与isEditable兼容
与isScrollEnabled兼容
与链接兼容

/// Class to allow links but no selection.
/// Basically, it disables unwanted UIGestureRecognizer from UITextView.
/// https://stackoverflow.com/a/49428307/1033581
class UnselectableTappableTextView: UITextView {

    // required to prevent blue background selection from any situation
    override var selectedTextRange: UITextRange? {
        get { return nil }
        set {}
    }

    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if gestureRecognizer is UIPanGestureRecognizer {
            // required for compatibility with isScrollEnabled
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }
        if let tapGestureRecognizer = gestureRecognizer as? UITapGestureRecognizer,
            tapGestureRecognizer.numberOfTapsRequired == 1 {
            // required for compatibility with links
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }
        // allowing smallDelayRecognizer for links
        // https://stackoverflow.com/questions/46143868/xcode-9-uitextview-links-no-longer-clickable
        if let longPressGestureRecognizer = gestureRecognizer as? UILongPressGestureRecognizer,
            // comparison value is used to distinguish between 0.12 (smallDelayRecognizer) and 0.5 (textSelectionForce and textLoupe)
            longPressGestureRecognizer.minimumPressDuration < 0.325 {
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }
        // preventing selection from loupe/magnifier (_UITextSelectionForceGesture), multi tap, tap and a half, etc.
        gestureRecognizer.isEnabled = false
        return false
    }
}

如果您的最低部署目标是iOS 11.1或更早版本

原生UITextView链接手势识别器在iOS 11.0-11.1中被破坏，需要小延迟长按而不是点击：Xcode 9 UITextView links no longer clickable

您可以使用自己的手势识别器正确支持链接，并且可以通过继承UITextView并禁止可以选择内容或点按某些内容的手势来禁用文本选择。

以下解决方案将禁止选择，并且是：

与isScrollEnabled兼容
与链接兼容
iOS 11.0和iOS 11.1的解决方法限制，但在点击文本附件时会丢失UI效果

/// Class to support links and to disallow selection.
/// It disables most UIGestureRecognizer from UITextView and adds a UITapGestureRecognizer.
/// https://stackoverflow.com/a/49428307/1033581
class UnselectableTappableTextView: UITextView {

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        // Native UITextView links gesture recognizers are broken on iOS 11.0-11.1:
        // https://stackoverflow.com/questions/46143868/xcode-9-uitextview-links-no-longer-clickable
        // So we add our own UITapGestureRecognizer.
        linkGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(textTapped))
        linkGestureRecognizer.numberOfTapsRequired = 1
        addGestureRecognizer(linkGestureRecognizer)
        linkGestureRecognizer.isEnabled = true
    }

    var linkGestureRecognizer: UITapGestureRecognizer!

    // required to prevent blue background selection from any situation
    override var selectedTextRange: UITextRange? {
        get { return nil }
        set {}
    }

    override func addGestureRecognizer(_ gestureRecognizer: UIGestureRecognizer) {
        // Prevents drag and drop gestures,
        // but also prevents a crash with links on iOS 11.0 and 11.1.
        // https://stackoverflow.com/a/49535011/1033581
        gestureRecognizer.isEnabled = false
        super.addGestureRecognizer(gestureRecognizer)
    }

    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if gestureRecognizer == linkGestureRecognizer {
            // Supporting links correctly.
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }
        if gestureRecognizer is UIPanGestureRecognizer {
            // Compatibility support with isScrollEnabled.
            return super.gestureRecognizerShouldBegin(gestureRecognizer)
        }
        // Preventing selection gestures and disabling broken links support.
        gestureRecognizer.isEnabled = false
        return false
    }

    @objc func textTapped(recognizer: UITapGestureRecognizer) {
        guard recognizer == linkGestureRecognizer else {
            return
        }
        var location = recognizer.location(in: self)
        location.x -= textContainerInset.left
        location.y -= textContainerInset.top
        let characterIndex = layoutManager.characterIndex(for: location, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
        let characterRange = NSRange(location: characterIndex, length: 1)

        if let attachment = attributedText?.attribute(.attachment, at: characterIndex, effectiveRange: nil) as? NSTextAttachment {
            if #available(iOS 10.0, *) {
                _ = delegate?.textView?(self, shouldInteractWith: attachment, in: characterRange, interaction: .invokeDefaultAction)
            } else {
                _ = delegate?.textView?(self, shouldInteractWith: attachment, in: characterRange)
            }
        }
        if let url = attributedText?.attribute(.link, at: characterIndex, effectiveRange: nil) as? URL {
            if #available(iOS 10.0, *) {
                _ = delegate?.textView?(self, shouldInteractWith: url, in: characterRange, interaction: .invokeDefaultAction)
            } else {
                _ = delegate?.textView?(self, shouldInteractWith: url, in: characterRange)
            }
        }
    }
}

Answer 2

您可以将UITextView的子类改为覆盖selectedTextRange的方法，将其设置为 nil 。链接仍然可以点击，但您无法选择其余文本（甚至是链接，但您可以点击它）。

class CustomTextView: UITextView {
override public var selectedTextRange: UITextRange? {
    get {
        return nil
    }
    set { }
}

Answer 3

您需要继承UITextView并覆盖gestureRecognizerShouldBegin (_:)方法，如下所示：

override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
    if isEditable == false {
        if let gesture =  gestureRecognizer as? UILongPressGestureRecognizer, gesture.minimumPressDuration == 0.5 {
            return false
        }
    }
    return true
}

这将阻止选择textview但链接将按预期工作

编辑：事实证明，当双击并按住时，您仍然可以选择文本。我发现它发生在两次点击之后（不是具有属性“minimalNumberOfTaps”的UITapGesture，而是一个接一个地进行不同的点击），所以解决方案是在第一步之后跟踪时间（大约0.7秒）完整代码：

var lastTapTime: TimeInterval = 0
    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if isEditable == false {
            if let gesture =  gestureRecognizer as? UILongPressGestureRecognizer, gesture.minimumPressDuration == 0.5 {
        return false
            }
        }
        if Date().timeIntervalSince1970 >= lastTapTime + 0.7 {
            lastTapTime = Date().timeIntervalSince1970
            return true
        } else {
            return false
        }
    }

这不是最优雅的解决方案，但似乎有效♂️

Answer 4

选择的答案在我的情况下不起作用，我不熟悉在内部UIGestureRecognizer内部比较未经证实的值。

我的解决方案是覆盖point(inside:with:)并允许在用户未触及链接文字时进行点击：https://stackoverflow.com/a/44878203/1153630

Answer 5

此答案适用于iOS 10.3.x及更低版本，其中您的UIView未嵌入子视图中。如需更强大，更现代的答案，请参阅Cœur's answer below 。

您需要阻止UITextView成为第一响应者。

1。将UITextView子类化为您自己的自定义类（MyTextView）。

2。覆盖canBecomeFirstResponder()。这是Swift中的一个例子：

斯威夫特3：

class MyTextView: UITextView {
    override func becomeFirstResponder() -> Bool {
        return false
    }
}

斯威夫特2：

class MyTextView: UITextView {
    override func canBecomeFirstResponder() -> Bool {
        return false
    }
}

仍会启用检测到的所有链接。我用电话号码对此进行了测试。

Answer 6

这对我有用;

class LinkDetectingTextView: UITextView {
    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if isEditable == false {
            if let _ = gestureRecognizer as? UITapGestureRecognizer {
                return false
            }

            if let longPressRecognizer = gestureRecognizer as? UILongPressGestureRecognizer,
                longPressRecognizer.minimumPressDuration == 0.5 { // prevent to select text but allow certain functionality in application

                return false
            }
        }

        return true
    }
}

此外，在应用程序中将longPressGestureRecognizer的minimumPressDuration设置为不同于0.5的其他值。

UITextView链接可选，无需其他文本可选

6 个答案:

如果您的最低部署目标是iOS 11.2或更高版本

如果您的最低部署目标是iOS 11.1或更早版本