ios - Swift-3 错误 : '-[_SwiftValue unsignedIntegerValue]: unrecognized selector

Question

以下代码与旧的 swift 完美配合。这是字符串的扩展

func stringByConvertingHTML() -> String {
    let newString = replacingOccurrences(of: "\n", with: "<br>")
    if let encodedData = newString.data(using: String.Encoding.utf8) {
        let attributedOptions : [String: AnyObject] = [
            NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType as AnyObject,
            NSCharacterEncodingDocumentAttribute: String.Encoding.utf8 as AnyObject
        ]
        do {
            let attributedString = try NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil) //Crash here
            return attributedString.string
        } catch {
            return self
        }
    }
    return self
}

但在 swift 3 中它崩溃说

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_SwiftValue unsignedIntegerValue]: unrecognized selector sent to instance 0x6080002565f0'

谁能建议我需要做什么？

Answer 1

我遇到了同样的问题:

let attributedOptions : [String: AnyObject] = [
            NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType as AnyObject,
            NSCharacterEncodingDocumentAttribute: String.Encoding.utf8 as AnyObject
        ]

此处 String.Encoding.utf8 类型检查失败。使用 NSNumber(value: String.Encoding.utf8.rawValue)