ios - 带有链接和 UITapGestureRecognizer 的 UILabel

Question

我有一个带有文本和链接的 UILabel。该链接只是文本的一部分而不是全部，但是，它在文本中的位置可以更改。

我已经使用 TTTAtributedLabel 来检测链接，现在我想在其余不是链接的文本上添加一个手势识别器。因为，链接位置可以更改，所以我不确定该怎么做。

如果没有外部库，这可能吗？

Answer 1

将其放入viewDidLoad:

self.textLabel.text = "Try to open https://www.google.com"
let text = self.textLabel.text
let sep = text?.components(separatedBy: " ")
for i in sep! {
    if isURL(string: i) {
        canopen.append(i)
    }
}

更容易处理标签点击的扩展:

extension UITapGestureRecognizer {

    func didTapText(in label: UILabel, range targetRange: NSRange) -> Bool {

        let layoutManager = NSLayoutManager()
        let textContainer = NSTextContainer(size: CGSize.zero)
        let textStorage = NSTextStorage(string: label.text!)
        layoutManager.addTextContainer(textContainer)
        textStorage.addLayoutManager(layoutManager)

        // Configuration must be the same as the label!
        textContainer.lineFragmentPadding = 0.0
        textContainer.lineBreakMode = label.lineBreakMode
        textContainer.maximumNumberOfLines = label.numberOfLines
        let labelSize = label.bounds.size
        textContainer.size = labelSize

        // Find the tapped character location and compare it to the specified range
        let locationOfTouchInLabel = self.location(in: label)
        let textBoundingBox = layoutManager.usedRect(for: textContainer)
        let textContainerOffset = CGPoint(x: (labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x, y: (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y)
        let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x, y: locationOfTouchInLabel.y - textContainerOffset.y)
        let indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)

        return NSLocationInRange(indexOfCharacter, targetRange)
    }

}

然后放置一个辅助函数来判断它是否是一个url:

func isURL(string: String?) -> Bool {
    guard let urlString = string else {return false}
    guard let url = URL(string: urlString) else {return false}
    if !UIApplication.shared.canOpenURL(url) {return false}

    let regEx = "((https|http)://)((\\w|-)+)(([.]|[/])((\\w|-)+))+"
    let predicate = NSPredicate(format:"SELF MATCHES %@", argumentArray:[regEx])
    return predicate.evaluate(with: string)
}

这就是要放入手势的 @IBAction 中的内容，其中 IBAction 的参数是 UITapGestureRecognizer，而不是 有吗？:

let text = self.textLabel.text

for i in canopen {
    if sender.didTapText(in: textLabel, range: (text! as NSString).range(of: i)) {
        print("Tapped on a link, so do nothing")
        return
    }
}

print("Did not tap on a link, so do something")
<#code#>

引用:http://samwize.com/2016/03/04/how-to-create-multiple-tappable-links-in-a-uilabel/