直接上代碼，通過以下計(jì)算就可以完成鏈接的識別以及替換，然后添加高亮以及對高亮文字添加點(diǎn)擊事件

let label = YYLabel()
        label.backgroundColor = .red
        label.numberOfLines = 0
        label.preferredMaxLayoutWidth = 200
        view.addSubview(label)
        label.snp.makeConstraints { (make) in
            make.left.equalTo(50)
            make.width.equalTo(200)
            make.top.equalTo(300)
        }
        
        var urls: [String] = []
        
        var string = "test\\n\ntest/\\n\n??\nhttps://mbd.baidu.com/newspage/data/landingsuper?context=%7B%22nid%22%3A%22news_9827769369551786176%22%7D&n_type=0&p_from=1 第二個 https://weibo.com/mygroups?gid=201209041125312675&wvr=6&leftnav=1&isspecialgroup=1 今天又是好天氣！今天又是好天氣！今天又是好天氣！今天又是好天氣！今天又是好天氣！";
        
//        var string = "est\\n\ntest/\\n\n??\nhttps://www.weibo.com/beat/beatslist/beat?keyword=測試 https://weibo.com/mygroups?gid=201209041125312675&wvr=6&leftnav=1&isspecialgroup=1 每天都很美好";

        let detector = try? NSDataDetector.init(types: NSTextCheckingResult.CheckingType.link.rawValue)
        let matches = detector?.matches(in: string, options: [.reportProgress], range: NSRange(location: 0, length: string.count))
        for match in matches! {
            if match.resultType == .link {
                if let url = match.url {
                    //這里獲取到的url是經(jīng)過encode處理的
                    urls.append(url.absoluteString)
                }
            }
        }
        
        print("encode urls \(urls)")
        
        let font = UIFont.systemFont(ofSize: 15)
        let attribbutes = NSMutableAttributedString(string: "")
        for str in urls {
           
            var strArray = string.components(separatedBy: str)
            if strArray.count < 2 {
                //如果沒有匹配到字符說明string沒有經(jīng)過encode，但是str為encode以后的字符，所以需要decode str才能識別
                if let decode = str.removingPercentEncoding {
                    strArray = string.components(separatedBy: decode)
                }
            }
            if let firstStr = strArray.first {
                let subAttribute = NSMutableAttributedString(string: firstStr)
                subAttribute.setColor(.cyan, range: NSRange(location: 0, length: firstStr.count))
                attribbutes.append(subAttribute)
                
                let hightText = YYTextHighlight()
                hightText.tapAction = { view, text, range, rect in
                    guard let url = URL(string: str) else {
                        print("error url \(str)")
                        return
                    }
                    print("open url \(url)")
                    UIApplication.shared.open(url, options: [:], completionHandler: nil)
                }
                
                let imageAttribute = NSMutableAttributedString.attachmentString(withContent: UIImage(named: "commend_kink"), contentMode: .scaleAspectFit, attachmentSize: .init(width: 18, height: 18), alignTo: font, alignment: .center)
                let replaceStr = NSMutableAttributedString(string: "查看鏈接")
                replaceStr.setColor(.yellow, range: NSRange(location: 0, length: 4))
                imageAttribute.append(replaceStr)
                imageAttribute.setTextHighlight(hightText, range: NSRange(location: 0, length: 5))
                attribbutes.append(imageAttribute)
            }
            
            if let lastStr = strArray.last {
                string = lastStr
            }
            
        }
        let lastAttribute = NSMutableAttributedString(string: string)
        lastAttribute.setColor(.cyan, range: NSRange(location: 0, length: string.count))
        attribbutes.append(lastAttribute)
        
        label.attributedText = attribbutes

注意點(diǎn)YYLabel UILabel用法差異

使用YYLabel和使用UILabel還是有一些區(qū)別的。如果使用UILabel設(shè)置了lable的font、textColor，在給label的text賦值或者attributedText賦值時，上述設(shè)置都會生效。但是YYLabel設(shè)置font、textColor只會對label的text生效，對于attributedText屬性必須對NSAttributedString、NSMutableAttributedString進(jìn)行設(shè)置。

YYLabel高度自適應(yīng) preferredMaxLayoutWidth

對于UIlabel僅設(shè)置label.numberOfLines = 0，并且不設(shè)置高度lable就會隨著顯示內(nèi)容自動增長，但是對于YYLable除了設(shè)置label.numberOfLines = 0，還要設(shè)置label.preferredMaxLayoutWidth，只有這樣YYLabel才會自增長。

String NSString 對于表情NSRange計(jì)算長度不同

由下圖可以看出對于純文字不管是String類型NSString計(jì)算結(jié)果都一樣。但是對于含有表情的文本計(jì)算，兩者計(jì)算結(jié)果不一樣。對于這種情況可以使用NSString計(jì)算也可以使用String調(diào)用.utf16.coun計(jì)算。NSString默認(rèn)使用utf16計(jì)算，而表情大部分也需要使用utf16計(jì)算，所以直接使用NSString就可以得到正確的結(jié)果。

 let range = NSMakeRange(0, string.count)
 let nsStr = string as NSString
 let conTentRange = NSMakeRange(0, nsStr.length)
 //let conTentRange = NSMakeRange(0, string.utf16.count)
 printf("range \(range) conTentRange \(conTentRange)  text \(text)")

image

YYTextHighlight和父視圖手勢會沖突問題

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        //YYTextHighlight和父視圖手勢會沖突，所以需要識別點(diǎn)擊位置是否包含YYTextHighlight
        if touch.view is YYLabel {
            let label = touch.view as? YYLabel
            if let label = label {
                var range = NSMakeRange(0, 1);
                let highlight = label._getHighlight(at: touch.location(in: label), range: &range)
                if highlight != nil {
                    return false
                }
            }
        }
        return true
    }

上邊代碼中-(YYTextHighlight *)_getHighlightAtPoint:(CGPoint)point range:(NSRangePointer)range;為私有方法，外部不可調(diào)用，又考慮到引用的是別人的第三方庫，所以需要創(chuàng)建一個YYLabel的分來，然后將此方法在YYLabel分類的.h中聲明。如下：

#import "YYLabel.h"

NS_ASSUME_NONNULL_BEGIN

@interface YYLabel (YHYYLabel)

- (YYTextHighlight *)_getHighlightAtPoint:(CGPoint)point range:(NSRangePointer)range;

@end

NS_ASSUME_NONNULL_END

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