带有术语和隐私超链接的UITextView在不同的UIViewController中打开

Question

我正在使用TextView，我想在用户接受条款和条件和隐私政策的文本中创建两个不同的链接。

而且我还需要每个链接来打开不同 UIViewController。

任何人都可以通过示例帮助我了解如何实现此目标吗？

我需要了解如何创建两个超级链接，以及如何以两个不同的方式打开它们 ViewControllers

谢谢大家能给我的帮助

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例如，...我想获得与此类似的TextView

Answer 1

您可以使用以下在swift 5.1上测试过的UITextView委托方法和属性字符串：

 let attributedString = NSMutableAttributedString(string: "By continueing you agree terms and conditions and the privacy policy")

        attributedString.addAttribute(.link, value: "terms://termsofCondition", range: (attributedString.string as NSString).range(of: "terms and conditions"))

        attributedString.addAttribute(.link, value: "privacy://privacypolicy", range: (attributedString.string as NSString).range(of: "privacy policy"))

        textView.linkTextAttributes = [ NSAttributedString.Key.foregroundColor: UIColor.blue]
        textView.attributedText = attributedString
        textView.delegate = self
        textView.isSelectable = true
        textView.isEditable = false
        textView.delaysContentTouches = false
        textView.isScrollEnabled = false

    func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {

        if URL.scheme == "terms" {
            //push view controller 1
            return false
        } else  if URL.scheme == "privacy"{
           // pushViewcontroller 2
             return false
        }
        return true
        // let the system open this URL
    }

如果用户点击或长按URL链接，则UITextView会调用此函数。此方法的实现是可选的。默认情况下，UITextview打开负责处理URL类型的那些应用程序并将URL传递给它们。您可以使用此方法触发替代操作

Answer 2

使用NSAttributedString可以达到此结果，使用NSAttributedString可以为文本设置样式，

myLabel.text = "By signing up you agree to our Terms & Conditions and Privacy Policy"
let text = (myLabel.text)!
let underlineAttriString = NSMutableAttributedString(string: text)
let range1 = (text as NSString).rangeOfString("Terms & Conditions")
underlineAttriString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleSingle.rawValue, range: range1)
let range2 = (text as NSString).rangeOfString("Privacy Policy")
underlineAttriString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleSingle.rawValue, range: range2)
myLabel.attributedText = underlineAttriString

扩展UITapGestureRecognizer以提供便利的功能来检测是否在(NSRange)中敲击了某个范围UILabel。

extension UITapGestureRecognizer {
    func didTapAttributedTextInLabel(label: UILabel, inRange targetRange: NSRange) -> Bool {
        // Create instances of NSLayoutManager, NSTextContainer and NSTextStorage
        let layoutManager = NSLayoutManager()
        let textContainer = NSTextContainer(size: CGSize.zero)
        let textStorage = NSTextStorage(attributedString: label.attributedText!)

        // Configure layoutManager and textStorage
        layoutManager.addTextContainer(textContainer)
        textStorage.addLayoutManager(layoutManager)

        // Configure textContainer
        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.locationInView(label)
        let textBoundingBox = layoutManager.usedRectForTextContainer(textContainer)
        let textContainerOffset = CGPointMake((labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
            (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);
        let locationOfTouchInTextContainer = CGPointMake(locationOfTouchInLabel.x - textContainerOffset.x,
            locationOfTouchInLabel.y - textContainerOffset.y);
        let indexOfCharacter = layoutManager.characterIndexForPoint(locationOfTouchInTextContainer, inTextContainer: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)

        return NSLocationInRange(indexOfCharacter, targetRange)
    }
}

[UITapGestureRecognizer将动作发送到tapLabel:，并使用扩展方法didTapAttributedTextInLabel:inRange:进行检测。

@IBAction func tapLabel(gesture: UITapGestureRecognizer) {
    let text = (myLabel.text)!
    let termsRange = (text as NSString).rangeOfString("Terms & Conditions")
    let privacyRange = (text as NSString).rangeOfString("Privacy Policy")

    if gesture.didTapAttributedTextInLabel(myLabel, inRange: termsRange) {
        print("Tapped terms")
    } else if gesture.didTapAttributedTextInLabel(myLabel, inRange: privacyRange) 
    {
        print("Tapped privacy")
    } else {
        print("Tapped none")
    }
}

Answer 3

像这样设置textView属性。

textView.attributedText = "By Continuing, you aggree to terms <a href='http://termsandservicelink'>Terms Of Services</a> and <a href='https://privacypolicylink'>Privacy Policy</a>".convertHtml()
textView.isEditable = false
textView.dataDetectorTypes = [.link]
textView.linkTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.blue, NSAttributedString.Key.underlineColor: UIColor.clear]

您可以在此委托中的链接上处理点击事件。

  func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
       //Check your url whether it is privacy policy or terms and do accordigly
        return true
    }

这里是字符串扩展名。

extension String{
    func convertHtml() -> NSAttributedString{
        guard let data = data(using: .utf8) else { return NSAttributedString() }
        do{
            return try NSAttributedString(data: data, options: [NSAttributedString.DocumentReadingOptionKey.documentType : NSAttributedString.DocumentType.html, NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        }catch{
            return NSAttributedString()
        }
    }
}