html - 如何在 swift 2.0 中解码 HTML 实体？

Question

我found this extension在计算器上。但是，出现错误。如何修复此错误？

Cannot invoke initializer for type 'NSAttributedString' with an argument list of type '(data: NSData, options: [String : AnyObject], documentAttributes: NilLiteralConvertible, error: NilLiteralConvertible)'

错误在“let attributedString”中。

extension String {
    init(htmlEncodedString: String) {
        let encodedData = htmlEncodedString.dataUsingEncoding(NSUTF8StringEncoding)!
        let attributedOptions : [String: AnyObject] = [
            NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
            NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding
        ]
        let attributedString = NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil, error: nil)! //ERROR HERE!
        self.init(attributedString.string)
    }
}

Answer 1

查看the docs我相信你有正确的方法，但请注意 Swift 2 有错误处理，所以你需要做:

extension String {
    init(htmlEncodedString: String) {
        do {
            let encodedData = htmlEncodedString.dataUsingEncoding(NSUTF8StringEncoding)!
            let attributedOptions : [String: AnyObject] = [
                NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding
            ]
            let attributedString = try NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil)
            self.init(attributedString.string)
        } catch {
            fatalError("Unhandled error: \(error)")
        }
    }
}

我已经在 playground 中对其进行了测试，并且可以顺利编译。