- (id)initWithBase64EncodedString:(NSString *)base64String options:(NSDataBase64DecodingOptions)options;
- (NSString *)base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)options;
- (id)initWithBase64EncodedData:(NSData *)base64Data options:(NSDataBase64DecodingOptions)options;
- (NSData *)base64EncodedDataWithOptions:(NSDataBase64EncodingOptions)options;
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这些方法可以帮助你轻易的将NSData对象转化为Base64，或者将Base64转化为NSData object。见以下的例子：
Crayon Syntax Highlighter v2.7.1
NSData* sampleData = [@"Some sample data" dataUsingEncoding:NSUTF8StringEncoding];
NSString * base64String = [sampleData base64EncodedStringWithOptions:0];
NSLog(@"Base64-encoded string is %@", base64String); // prints "U29tZSBzYW1wbGUgZGF0YQ=="
NSData* dataFromString = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
NSLog(@"String is %@",[NSString stringWithUTF8String:[dataFromString bytes]]); // prints "String is Some sample data"
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NSData* sampleData = [@"Some sample data" dataUsingEncoding:NSUTF8StringEncoding];
NSString * base64String = [sampleData base64EncodedStringWithOptions:0];
NSLog(@"Base64-encoded string is %@", base64String); // prints "U29tZSBzYW1wbGUgZGF0YQ=="
NSData* dataFromString = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
NSLog(@"String is %@",[NSString stringWithUTF8String:[dataFromString bytes]]); // prints "String is Some sample data"
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如果你需要支持iOS6或者更早以前的系统，你可以使用以下两个方法：
Crayon Syntax Highlighter v2.7.1
/* These methods first appeared in NSData.h on OS X 10.9 and iOS 7.0. They are deprecated in the same releases in favor of
the methods in the <code>NSDataBase64Encoding</code> category. However, these methods have existed for several releases, so
they may be used for applications targeting releases prior to OS X 10.9 and iOS 7.0.
*/
- (id)initWithBase64Encoding:(NSString *)base64String;
- (NSString *)base64Encoding;
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/* These methods first appeared in NSData.h on OS X 10.9 and iOS 7.0. They are deprecated in the same releases in favor of
the methods in the <code>NSDataBase64Encoding</code> category. However, these methods have existed for several releases, so
they may be used for applications targeting releases prior to OS X 10.9 and iOS 7.0.
*/