UIImage 与 base64字符串 互转：

UIImage图片转成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: %@", _encodedImageStr);

    Base64字符串转UIImage图片：

NSData *_decodedImageData   = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];    UIImage *_decodedImage      = [UIImage imageWithData:_decodedImageData];    NSLog(@"===Decoded image size: %@", NSStringFromCGSize(_decodedImage.size));