我正在将我的代码迁移到swift 3,而我正在努力使用此扩展程序,该扩展正在使用之前的swift版本.
extension Data {
var attributedString: NSAttributedString? {
do {
return try NSAttributedString(data: self, options:[NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8], documentAttributes: nil)
} catch let error as NSError {
print(error.localizedDescription)
}
return nil
}
}
现在,当我尝试调用这段代码时,我得到一个像这样的异常错误
error: warning: couldn't get required object pointer (substituting NULL): Couldn't load 'self' because its value couldn't be evaluated
这就是我从视图控制器调用该方法的方法
let htmlCode = "<html><head><style type=\"text/css\">@font-face {font-family: Avenir-Roman}body {font-family: Avenir-Roman;font-size:15;margin: 0;padding: 0}</style></head><body bgcolor=\"#FBFBFB\">" + htmlBodyCode + "</body>"
newsDescription.attributedText = htmlCode.utf8Data?.attributedString
我试图layerClass()在swift 3中覆盖该方法,但我收到了错误Method does not override any method from its superclass.在swift 2.x中,我这样做,是否有人知道新语法？
override func layerClass() -> AnyClass { return CAGradientLayer.self }