url的编码与解码，在工程中很常用，编解码针对特殊字符及中文，确保url可以正常访问
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| let KUrlCodingReservedCharacters = "!*'();:|@&=+$,/?%#[]{}"
extension NSString {
/// url编码
///
/// - Returns: NSString
func urlEncode() -> NSString? {
return self.addingPercentEncoding(withAllowedCharacters: CharacterSet(charactersIn: KYKUrlCodingReservedCharacters).inverted)! as NSString
}
/// url解码
///
/// - Returns: NSString
func urlDecode() -> NSString? {
return self.removingPercentEncoding as NSString?
}
}
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