更好的解决方案:

NSData中有一个内置函数

[data base64Encoding]; //iOS < 7.0
[data base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength]; //iOS >= 7.0

iOS8及以后使用- (NSString *)base64EncodedStringWithOptions:(NSDataBase64EncodingOptions) NSData的选项

根据您的要求，我已经使用Swift 4创建了一个示例演示，您可以根据您的要求编码/解码字符串和图像。

I have also added sample methods of relevant operations. // // Base64VC.swift // SOF_SortArrayOfCustomObject // // Created by Test User on 09/01/18. // Copyright © 2018 Test User. All rights reserved. // import UIKit import Foundation class Base64VC: NSObject { //---------------------------------------------------------------- // MARK:- // MARK:- String to Base64 Encode Methods //---------------------------------------------------------------- func sampleStringEncodingAndDecoding() { if let base64String = self.base64Encode(string: "TestString") { print("Base64 Encoded String: \n\(base64String)") if let originalString = self.base64Decode(base64String: base64String) { print("Base64 Decoded String: \n\(originalString)") } } } //---------------------------------------------------------------- func base64Encode(string: String) -> String? { if let stringData = string.data(using: .utf8) { return stringData.base64EncodedString() } return nil } //---------------------------------------------------------------- func base64Decode(base64String: String) -> String? { if let base64Data = Data(base64Encoded: base64String) { return String(data: base64Data, encoding: .utf8) } return nil } //---------------------------------------------------------------- // MARK:- // MARK:- Image to Base64 Encode Methods //---------------------------------------------------------------- func sampleImageEncodingAndDecoding() { if let base64ImageString = self.base64Encode(image: UIImage.init(named: "yourImageName")!) { print("Base64 Encoded Image: \n\(base64ImageString)") if let originaImage = self.base64Decode(base64ImageString: base64ImageString) { print("originalImageData \n\(originaImage)") } } } //---------------------------------------------------------------- func base64Encode(image: UIImage) -> String? { if let imageData = UIImagePNGRepresentation(image) { return imageData.base64EncodedString() } return nil } //---------------------------------------------------------------- func base64Decode(base64ImageString: String) -> UIImage? { if let base64Data = Data(base64Encoded: base64ImageString) { return UIImage(data: base64Data)! } return nil } }

iOS内置了对base64编码和解码的支持。如果你查看resolv.h，你会看到两个函数b64_ntop和b64_pton。Square SocketRocket库提供了一个如何从objective-c中使用这些函数的合理示例。

这些功能都经过了很好的测试和可靠-不像你在网上随便看到的那些实现。 不要忘记链接libresolve .dylib。

在mvds的出色改进中，存在两个问题。更改代码如下:

raw = tmpbuf;
inp = 0;
outbuf[outp++] = base64EncodingTable[(raw[inp] & 0xFC) >> 2];
outbuf[outp++] = base64EncodingTable[((raw[inp] & 0x03) << 4) | ((raw[inp+1] & 0xF0) >> 4)];
if ( left == 2 ) outbuf[outp++] = base64EncodingTable[((raw[inp+1] & 0x0F) << 2) | ((raw[inp+2] & 0xC0) >> 6)];
else outbuf[outp++] = '=';
outbuf[outp++] = '=';

关于在iOS7中使用NSData (NSDataBase64Encoding)类别方法的更新，请参阅我的回答:https://stackoverflow.com/a/18927627/1602729