IOS图片转base64字符串和字符串转回图片

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:\n%@" , _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));