Base64 Encoding and Decoding

NSData* sampleData = [@"Some sample data" dataUsingEncoding:NSUTF8StringEncoding];


Base64 Encoding:
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NSString * base64String = [sampleData base64EncodedStringWithOptions:0];
NSLog(@"Base64-encoded string is %@", base64String); // prints "U29tZSBzYW1wbGUgZGF0YQ=="


Base64 Decoding:
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NSData* dataFromString = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
NSLog(@"String is %@",[NSString stringWithUTF8String:[dataFromString bytes]]); // prints "Some sample data"