html字符串转富文本字符串（Swift 4）

最新推荐文章于 2025-06-29 09:34:09 发布

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#html字符串转富文本

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本文介绍了三种使用Swift将HTML字符串转换为NSMutableAttributedString的方法。这些方法包括利用不同的HTML结构（如<head>和<html>标签）来确保正确的样式应用及图片显示。这些技巧对于iOS开发中处理富文本内容特别有用。

///方法1-->通过'<head>'将html字符串转化为 NSMutableAttributedString
    class func getAttriFrom(str: String) -> NSMutableAttributedString {
        let htmlStr = "<head><style>img{max-width:\(screenWidth-30)px !important; height:auto}</style></head>" + "<div style='font-size:13.7px'>" + str + "</div>"
        print("方法1-->\(htmlStr)")
        let attStr = try? NSMutableAttributedString.init(data: htmlStr.data(using: String.Encoding.utf16)!, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil)
        return attStr ?? NSMutableAttributedString()
    }

    ///方法2<此方法某些图片不会正常显示>-->通过'<html>'htmlStr 转化为 NSMutableAttributedString
    class func getAttriFrom2(str: String) -> NSMutableAttributedString {
        let headerS = "<html lang=\"zh-cn\"><head><meta charset=\"utf-8\"><meta name=\"viewport\" content=\"width=device-width, nickName-scalable=no\"></meta><style>img{max-width: 100%; width:auto; height:auto;}body{text-align:justify;font-size:14px !important;}</style></head><body>"
        let endS = "</body></html>"
        let htmlStr = headerS + str + endS
        print("方法2--->\(htmlStr)")
        let attStr = try? NSMutableAttributedString.init(data: htmlStr.data(using: String.Encoding.utf8)!, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil)
        return attStr ?? NSMutableAttributedString()
    }


    
  ///方法3-->通过'<html>'htmlStr 转化为 NSMutableAttributedString

    class func getAttriFrom3(str: String) -> NSMutableAttributedString {

        let headerS = "<html lang=\"zh-cn\"><head><meta charset=\"utf-8\"><meta name=\"viewport\" content=\"width=device-width, nickName-scalable=no\"></meta><style>img{max-width: \(screenWidth-20); !important; height:auto; margin: 0 auto; padding: 10px 10px 10px 0px; width: 100% !important;} body{text-align:justify;font-size:14px !important;}</style></head><body>"
        let endS = "</body></html>"
        let htmlStr = headerS + str + endS
        //print("方法3--->\(htmlStr)")
        var attStr = NSMutableAttributedString()
        do {
            attStr = try NSMutableAttributedString.init(data: htmlStr.data(using: String.Encoding.utf8)!, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil)
        } catch {
            print(error)
        }
        return attStr

    }