[Swift]扩展String类：Base64的编码和解码

佚名 6年前 (2019-04-08) 随笔 758人围观抢沙发百度已收录

扩展方式1：

 1 extension String {
 2     //Base64编码
 3     func encodBase64() -> String? {
 4         if let data = self.data(using: .utf8) {
 5             return data.base64EncodedString()
 6         }
 7         return nil
 8     }
 9 
10     //Base64解码
11     func decodeBase64() -> String? {
12         if let data = Data(base64Encoded: self) {
13             return String(data: data, encoding: .utf8)
14         }
15         return nil
16     }
17 }

扩展方式2：

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 1 extension String {
 2     //Base64编码
 3     func encodBase64() -> String?
 4     {
 5         let strData = self.data(using: String.Encoding.utf8)
 6         let base64String = strData?.base64EncodedString(options: NSData.Base64EncodingOptions.init(rawValue: 0))
 7         return base64String
 8     }
 9 
10     //Base64解码
11     func decodeBase64() -> String?
12     {
13         let decodedData = NSData(base64Encoded: self, options: NSData.Base64DecodingOptions.init(rawValue: 0))
14         let decodedString = NSString(data: decodedData! as Data, encoding: String.Encoding.utf8.rawValue) as String?
15         return decodedString
16     }
17 }

测试代码：

1 var str:String = "Strengthen"
2 let strBase64:String = str.encodBase64()!
3 print(strBase64)
4 //Print U3RyZW5ndGhlbg==
5 
6 print(strBase64.decodeBase64())
7 //Print Optional("Strengthen")