Swift 通过添加百分比创建字符串

Question

我如何将其转换为当前的 swift 语法。我过得很艰难。

extension String {
    var escaped: String {
        return CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,self as CFString!,"[]." as CFString!,":/?&=;+!#$()@',*" as CFString!,CFStringConvertNSStringEncodingToEncoding(String.Encoding.utf8.rawValue)) as String
    }
}

Answer 1

简单地说:

var escaped: String {
   let allowedCharacters = CharacterSet(charactersIn: ":/?&=;+!#$()@',*")
   return addingPercentEncoding(withAllowedCharacters: allowedCharacters)!
}