UIImage圖片轉成base64字符串：

    UIImage *_originImage = [UIImage imageNamed:@"full_playlist_hl.png"];

    NSData *_data = UIImageJPEGRepresentation(_image, 1.0f);

    NSString *_encodedImageStr = [_data base64Encoding];

    NSLog(@"===Encoded image:\n%@", _encodedImageStr);

Base64字符串轉UIImage圖片：

    NSData *_decodedImageData   = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];

    UIImage *_decodedImage      = [UIImage imageWithData:_decodedImageData];

    NSLog(@"===Decoded image size: %@", NSStringFromCGSize(_decodedImage.size));

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