IOS 图片base64字符串 & 字符串图片

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));