如何獲取PHAsset中的圖像類型（PNG或JPG）？

Question

在iOS8及更高版本中，我通過以下代碼獲取圖像：

    PHFetchOptions *option = [[PHFetchOptions alloc] init];
    option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
    PHFetchResult *result = [PHAsset fetchAssetsInAssetCollection:_collection options:option];

    [result enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if (((PHAsset *)obj).mediaType == PHAssetMediaTypeImage) {

            PHCachingImageManager *imageManager = [[PHCachingImageManager alloc] init];
            PHAsset *asset = obj;
            PHImageRequestOptions * options = [[PHImageRequestOptions alloc] init];
            options.networkAccessAllowed = YES;
            options.synchronous = YES;


            [imageManager requestImageDataForAsset:asset options:options resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
                /*******/
                /* Now I get image type in here with imageDate*/
                /* I just want JPG type Image*/
            }];
        }
    }];

但是在這段代碼中，我需要很多時間，所以如何使用PHAsset獲取圖像類型並且不使用requestImageData

Answer 1

據我所知，您無法通過PHAsset獲取圖像類型，但是可以通過CIImage的屬性properties（properties是屬性的名稱）來獲取