如何将二维码转换成base64码

NSData* originData = [@"1" dataUsingEncoding:NSASCIIStringEncoding];
NSString* encodeResult = [originData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
NSLog(@"encodeResult:%@",encodeResult);

NSData* decodeData = [[NSData alloc] initWithBase64EncodedString:encodeResult options:0];
NSString* decodeStr = [[NSString alloc] initWithData:decodeData encoding:NSASCIIStringEncoding];
NSLog(@"decodeStr==%@",decodeStr);