iOS 7+ 中的 Base64 解码
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时间：2020-08-31 01:52:01 来源:igfitidea点击:
Base64 Decoding in iOS 7+
提问by Sandeep Khade
I have Encoded text(NSString) using NSDataClass new API which is Added in iOS7.
我NSString使用NSDataiOS7 中添加的 Class new API对文本（）进行了编码。
using this
使用这个
- (NSData *)dataUsingEncoding:(NSStringEncoding)encoding;
here is my code
这是我的代码
NSString *base64EncodedString = [[myText dataUsingEncoding:NSUTF8StringEncoding] base64EncodedStringWithOptions:0];
NSLog(@"%@", base64EncodedString);
I am looking to decode it
我正在寻找解码它
回答by Gabriele Petronella
Swift 3+
斯威夫特 3+
let plainString = "foo"
Encoding
编码
let plainData = plainString.data(using: .utf8)
let base64String = plainData?.base64EncodedString()
print(base64String!) // Zm9v
Decoding
解码
if let decodedData = Data(base64Encoded: base64String!),
let decodedString = String(data: decodedData, encoding: .utf8) {
print(decodedString) // foo
}
Swift < 3
斯威夫特 < 3
let plainString = "foo"
Encoding
编码
let plainData = plainString.dataUsingEncoding(NSUTF8StringEncoding)
let base64String = plainData?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
print(base64String!) // Zm9v
Decoding
解码
let decodedData = NSData(base64EncodedString: base64String!, options: NSDataBase64DecodingOptions(rawValue: 0))
let decodedString = NSString(data: decodedData, encoding: NSUTF8StringEncoding)
print(decodedString) // foo
Objective-C
目标-C
NSString *plainString = @"foo";
Encoding
编码
NSData *plainData = [plainString dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64String = [plainData base64EncodedStringWithOptions:0];
NSLog(@"%@", base64String); // Zm9v
Decoding
解码
NSData *decodedData = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
NSString *decodedString = [[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding];
NSLog(@"%@", decodedString); // foo
回答by Tommy
In case you want to write fallback code, decoding from base64 has been present in iOS since the very beginning by caveat of NSURL:
如果您想编写回退代码，从一开始就存在于 iOS 中的 base64 解码，警告NSURL：
NSURL *URL = [NSURL URLWithString:
[NSString stringWithFormat:@"data:application/octet-stream;base64,%@",
base64String]];
return [NSData dataWithContentsOfURL:URL];
