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UITextView带有超链接文本

swiftinterface-builderios9xcode8
44

我想在iOS9+中使用不可编辑的UITextView嵌入这样的文本：

只需点击此处注册

我可以创建一个函数来操作文本，但是否有更简单的方法？

我发现可以使用NSTextCheckingTypeLink，因此在Interface Builder中使文本可点击而没有“点击此处”部分很简单：

只需http://example.com注册

如果相关的话，我正在使用Xcode 8和Swift 3。

11个回答
87

设置 isEditable = false，否则当用户点击它时，文本视图将进入文本编辑模式。

Swift 4 及更高版本

let attributedString = NSMutableAttributedString(string: "Just click here to register")
let url = URL(string: "https://www.apple.com")!

// Set the 'click here' substring to be the link
attributedString.setAttributes([.link: url], range: NSMakeRange(5, 10))

self.textView.attributedText = attributedString
self.textView.isUserInteractionEnabled = true
self.textView.isEditable = false

// Set how links should appear: blue and underlined
self.textView.linkTextAttributes = [
    .foregroundColor: UIColor.blue,
    .underlineStyle: NSUnderlineStyle.single.rawValue
]
UITextItemInteraction是iOS10及以上版本的，但我需要在iOS9上使用。我会看看能否修复并在稍后投票支持这个问题。 - Adam Nelson
3
在 Swift 4 中，属性已被重命名为 .link（用于替代 NSLinkAttributedName）和 .foregroundColor（用于替代 NSForegroundColorAttributeName）。 - Barlow Tucker
3
如果您还没有阅读问题，请注意上面的示例中的NSMakeRange（5,10）可以解释为从5->第一个字符（'c'）的索引到排除的10->最后一个字符（'k'）的范围，但是这种方式可能会导致越界错误。 NSMakeRange实际上需要5->第一个字符（'c'）和10->范围长度。 - Martin
我也需要以下答案才能使链接可点击。https://stackoverflow.com/a/14387132/5845039 - Muhammad Yusuf
25

如果您想使用多个超链接，您可以在Swift 5中使用此替代方法。

extension UITextView {

  func addHyperLinksToText(originalText: String, hyperLinks: [String: String]) {
    let style = NSMutableParagraphStyle()
    style.alignment = .left
    let attributedOriginalText = NSMutableAttributedString(string: originalText)
    for (hyperLink, urlString) in hyperLinks {
        let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
        let fullRange = NSRange(location: 0, length: attributedOriginalText.length)
        attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: urlString, range: linkRange)
        attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
        attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: YourFont, range: fullRange)
    }
    
    self.linkTextAttributes = [
        NSAttributedString.Key.foregroundColor: YourColor,
        NSAttributedString.Key.underlineStyle: NSUnderlineStyle.single.rawValue,
    ]
    self.attributedText = attributedOriginalText
  }
}

用法：

yourTextView.addHyperLinksToText(originalText: "Testing hyperlinks here and there", hyperLinks: ["here": "someUrl1", "there": "someUrl2"])
1
它有效了！谢谢。这对于有多个链接的情况非常有帮助！ :) - Rakshitha Muranga Rodrigo
它按预期工作。并且非常可重复使用。感谢兄弟完全解决的答案。 - Bilal Khan
13

使用扩展的Swift 3相同解决方案：

A. 添加扩展 -

extension UITextView {
    func hyperLink(originalText: String, hyperLink: String, urlString: String) {
        let style = NSMutableParagraphStyle()
        style.alignment = .center
        let attributedOriginalText = NSMutableAttributedString(string: originalText)
        let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
        let fullRange = NSMakeRange(0, attributedOriginalText.length)
        attributedOriginalText.addAttribute(NSLinkAttributeName, value: urlString, range: linkRange)
        attributedOriginalText.addAttribute(NSParagraphStyleAttributeName, value: style, range: fullRange)
        attributedOriginalText.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 10), range: fullRange)
        self.linkTextAttributes = [
            NSForegroundColorAttributeName: UIConfig.primaryColour,
            NSUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue,
        ]
        self.attributedText = attributedOriginalText
    }
}

B. 添加链接 URL - let linkUrl = "https://www.my_website.com"

C. 在您的 ViewController 中实现 UITextViewDelegate，如下所示 - 

 class MyViewController: UIViewController, UITextViewDelegate { 
 }

添加委托方法以处理点击事件 - 

func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
    if (URL.absoluteString == linkUrl) {
        UIApplication.shared.openURL(URL)
    }
    return false
    }
}

E. 最后，在属性检查器下，确保以下事项适用于您的 UITextView：

  1. 行为 - 可编辑已关闭并选择已打开。
  2. 数据探测器 - 链接已启用。

使用 - 

textView.hyperLink(originalText: "To find out more please visit our website", hyperLink: "website", urlString: linkUrl)

祝福并愉快地编码！

1
不要忘记添加 textView.delegate = self。 - carrotzoe
9

Swift 5 这是基于Tejas的答案，由于两个类中的一些项目已被弃用，因此需要更新。

extension UITextView {


func hyperLink(originalText: String, hyperLink: String, urlString: String) {

    let style = NSMutableParagraphStyle()
    style.alignment = .left

    let attributedOriginalText = NSMutableAttributedString(string: originalText)
    let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
    let fullRange = NSMakeRange(0, attributedOriginalText.length)
    attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: urlString, range: linkRange)
    attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
    attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.blue, range: fullRange)
    attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: UIFont.systemFont(ofSize: 10), range: fullRange)

    self.linkTextAttributes = [
        kCTForegroundColorAttributeName: UIColor.blue,
        kCTUnderlineStyleAttributeName: NSUnderlineStyle.single.rawValue,
        ] as [NSAttributedString.Key : Any]

    self.attributedText = attributedOriginalText
}

不要忘记将UITextViewDelegate添加到您的视图控制器中，并设置您的链接网址let linkUrl = "https://example.com"。

func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
    if (URL.absoluteString == linkUrl) {
        UIApplication.shared.open(URL) { (Bool) in

        }
    }
    return false
}

使用方式不变：

textView.hyperLink(originalText: "To find out more please visit our website", hyperLink: "website", urlString: linkUrl)
您必须在Storyboard的"Attribute Inspector"中设置“TextView的数据检测器”-->“链接”属性。只有这样，这段代码才能起作用。 - pallavi
5

Swift 4代码。 也许只有我需要在一条消息中设置多个链接并将单词着色。我创建了一个AttribTextHolder类来累积关于文本的所有信息并轻松地在对象之间传递它，以将文本设置到控制器深处的UITextView中。

class AttribTextHolder {

        enum AttrType {
            case link
            case color
        }

        let originalText: String
        var attributes: [(text: String, type: AttrType, value: Any)]


        init(text: String, attrs: [(text: String, type: AttrType, value: Any)] = [])
        {
            originalText = text
            attributes = attrs
        }

        func addAttr(_ attr: (text: String, type: AttrType, value: Any)) -> AttribTextHolder {
            attributes.append(attr)
            return self
        }

        func setTo(textView: UITextView)
        {
            let style = NSMutableParagraphStyle()
            style.alignment = .left

            let attributedOriginalText = NSMutableAttributedString(string: originalText)

            for item in attributes {
                let arange = attributedOriginalText.mutableString.range(of: item.text)
                switch item.type {
                case .link:
                    attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: item.value, range: arange)
                case .color:
                    var color = UIColor.black
                    if let c = item.value as? UIColor { color = c }
                    else if let s = item.value as? String { color = s.color() }
                    attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: color, range: arange)
                default:
                    break
                }
            }

            let fullRange = NSMakeRange(0, attributedOriginalText.length)
            attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)

            textView.linkTextAttributes = [
                kCTForegroundColorAttributeName: UIColor.blue,
                kCTUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue,
            ] as [String : Any]

            textView.attributedText = attributedOriginalText
        }
 }

使用方法如下：

 let txt = AttribTextHolder(text: "To find out more visit our website or email us your questions")
            .addAttr((text: "our website", type: .link, "http://example.com"))
            .addAttr((text: "our website", type: .color, "#33BB22"))
            .addAttr((text: "email us", type: .link, "mailto:us@example.com"))
            .addAttr((text: "email us", type: .color, UIColor.red))
 ....
 ....
 txt.setTo(textView: myUITextView)

在这段代码中，我使用简单的字符串扩展将字符串十六进制值转换为UIColor对象。

extension String {
/// Converts string color (ex: #23FF33) into UIColor
func color() -> UIColor {
    let hex = self.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
    var int = UInt32()
    Scanner(string: hex).scanHexInt32(&int)
    let a, r, g, b: UInt32
    switch hex.characters.count {
    case 3: // RGB (12-bit)
        (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
    case 6: // RGB (24-bit)
        (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
    case 8: // ARGB (32-bit)
        (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
    default:
        (a, r, g, b) = (255, 0, 0, 0)
    }
    return UIColor(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
  }
}
这是很棒的东西。考虑将其打包成一个库！ - Shayne
5

使用 Swift >= 4：

let descriptionText = NSMutableAttributedString(string:"To learn more, check out our ", attributes: [:])

let linkText = NSMutableAttributedString(string: "Privacy Policy and Terms of Use", attributes: [NSAttributedString.Key.link: URL(string: example.com)!])

descriptionText.append(linkText)
2

使用扩展实现的适用于Swift 4的相同解决方案：

extension UITextView {


    func hyperLink(originalText: String, hyperLink: String, urlString: String) {

            let style = NSMutableParagraphStyle()
            style.alignment = .left

            let attributedOriginalText = NSMutableAttributedString(string: originalText)
            let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
            let fullRange = NSMakeRange(0, attributedOriginalText.length)
            attributedOriginalText.addAttribute(NSAttributedStringKey.link, value: urlString, range: linkRange)
            attributedOriginalText.addAttribute(NSAttributedStringKey.paragraphStyle, value: style, range: fullRange)
            attributedOriginalText.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.blue, range: fullRange)
            attributedOriginalText.addAttribute(NSAttributedStringKey.font, value: UIFont.systemFont(ofSize: 10), range: fullRange)

            self.linkTextAttributes = [
               kCTForegroundColorAttributeName: UIColor.blue,
               kCTUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue,
            ] as [String : Any]


            self.attributedText = attributedOriginalText
        }

}
1

SWIFT 5和多个链接

import UIKit

public extension UITextView {
    
    func hyperLink(originalText: String, linkTextsAndTypes: [String: String]) {
        
        let style = NSMutableParagraphStyle()
        style.alignment = .left
        
        let attributedOriginalText = NSMutableAttributedString(string: originalText)
        
        for linkTextAndType in linkTextsAndTypes {
            let linkRange = attributedOriginalText.mutableString.range(of: linkTextAndType.key)
            let fullRange = NSRange(location: 0, length: attributedOriginalText.length)
            attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: linkTextAndType.value, range: linkRange)
            attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
            attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.blue, range: fullRange)
            attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: UIFont.systemFont(ofSize: 10), range: fullRange)
        }
        
        self.linkTextAttributes = [
            kCTForegroundColorAttributeName: UIColor.blue,
            kCTUnderlineStyleAttributeName: NSUnderlineStyle.single.rawValue
        ] as [NSAttributedString.Key: Any]
        
        self.attributedText = attributedOriginalText
    }
}

而在你的 viewController 中的使用：

@IBOutlet weak var termsHyperlinkTextView: UITextView! {
        didSet {
            termsHyperlinkTextView.delegate = self
            termsHyperlinkTextView.hyperLink(originalText: "Check out terms & conditions or our privacy policy",
                                             linkTextsAndTypes: ["terms & conditions": LinkType.termsAndConditions.rawValue,
                                                                 "privacy policy": LinkType.privacyPolicy.rawValue])

        }
    }


enum LinkType: String {
        case termsAndConditions
        case privacyPolicy
    }


// MARK: - UITextViewDelegate
extension ViewController: UITextViewDelegate {
    func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
        if let linkType = LinkType(rawValue: URL.absoluteString) {
            // TODO: handle linktype here with switch or similar.
        }
        return false
    }
}
1
使用UITextView实现超链接的更安全解决方案
var termsConditionsTextView: UITextView = {
let view = UITextView()
 view.backgroundColor = .clear
 view.textAlignment = .left
 
 let firstTitleString = "By registering for THIS_APP I agree with the "
 let secondTitleString = "Terms & Conditions"
 let finishTitleString = firstTitleString + secondTitleString
 let attributedString = NSMutableAttributedString(string: finishTitleString)
 attributedString.addAttribute(.link, value: "https://stackoverflow.com", range: NSRange(location: firstTitleString.count, length: secondTitleString.count))
 
 view.attributedText = attributedString
 view.textContainerInset = .zero
 view.linkTextAttributes = [
     .foregroundColor: UIColor.blue,
     .underlineStyle: NSUnderlineStyle.single.isEmpty
 ]
 
 view.font = view.font = UIFont(name: "YOUR_FONT_NAME", size: 16)
 view.textColor = UIColor.black
 
 return view }()
-1
您可以使用这个简单的方法为任何以tag开头的字符集添加超链接。
func addLink(forString string : NSMutableAttributedString
        ,baseURL : String
        ,tag : String){
        let array = string.string.replacingOccurrences(of: "\n", with: " ").components(separatedBy: " ")
        let filterArray = array.filter { (string) -> Bool in
            return string.contains(tag)
        }
        for element in filterArray {
            let removedHashtag = element.replacingOccurrences(of: tag, with: "")
            let url = baseURL + removedHashtag
            let range = NSString.init(string: (string.string)).range(of: element)
            string.addAttributes([NSAttributedStringKey.link : url.replacingOccurrences(of: " ", with: "")], range: range)
        }
    }
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