iOS Label加载HTML

func getHtml(){
    guard let filePath = Bundle.main.path(forResource: "demo", ofType: "html") else{return}
    guard let data = NSData.init(contentsOfFile: filePath) as Data? else {return}
    guard let contentStr = String.init(data: data, encoding: String.Encoding.utf8) else{return}

    do{
        let attrStr = try NSAttributedString.init(data: contentStr.data(using: String.Encoding.unicode)!, options: [NSAttributedString.DocumentReadingOptionKey.documentType : NSAttributedString.DocumentType.html], documentAttributes: nil)
        self.htmlLabel.attributedText = attrStr
    }catch{
       print(error.localizedDescription)
    }
}

<key>NSAppTransportSecurity</key>
<dict>
	<key>NSAllowsArbitraryLoads</key>
	<true/>
</dict>