不使用UIImagePickerControllerOriginalImage获取相册图片

 

 

一般用imagePickerController获取到dic以后常用的方法是使用

 

UIImage *image = [dic objectForKey:@"UIImagePickerControllerOriginalImage"];

来获取原图，但是我使用这个方法获取到得图片并不是原图，而是尺寸经过压缩后的，后来找到了一个新的方法来进行获取 直接贴代码

 

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
     [library assetForURL:[dic objectForKey:UIImagePickerControllerReferenceURL]
              resultBlock:^(ALAsset *asset)
      {
          ALAssetRepresentation *representation = [asset defaultRepresentation];
          CGImageRef imgRef = [representation fullResolutionImage];
          UIImage *image = [UIImage imageWithCGImage:imgRef
                                             scale:representation.scale
                                       orientation:(UIImageOrientation)representation.orientation];
          NSData * data = UIImageJPEGRepresentation(image, 0.5);

      }failureBlock:^(NSError *error){
          NSLog(@"couldn't get asset: %@", error);
      }
      ];