仅获取PHAssetMediaTypeImage类型的照片，表单资产集合类型PHAssetCollectionTypeSmartAlbum [英] Fetch only photos of type PHAssetMediaTypeImage form asset collection type PHAssetCollectionTypeSmartAlbum

问题描述

我正在使用Photos框架来获取iOS8中的专辑列表。我能够使用

I am using the Photos framework to fetch album list in iOS8. I am able to do it using

PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];

这为我提供了所有智能相册的列表，包括视频。如何过滤此列表中的视频。我只需要图像。

This gives me a list of all smart albums including videos. How can I filter out videos from this list. I need only images.

帮助将不胜感激。谢谢。

Help would be appreciated. Thanks.

推荐答案

你应该设置fetch选项，它有一个属性谓词，可用于过滤视频。下面是这样做的一个例子。

You should set up fetch options, its has a property predicate, which can be used to filter videos. Below is an example of doing that.

PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];

//set up fetch options, mediaType is image.
PHFetchOptions *options = [[PHFetchOptions alloc] init];
options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
options.predicate = [NSPredicate predicateWithFormat:@"mediaType = %d",PHAssetMediaTypeImage];

for (NSInteger i =0; i < smartAlbums.count; i++) {
    PHAssetCollection *assetCollection = smartAlbums[i];
    PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:options];

    NSLog(@"sub album title is %@, count is %ld", assetCollection.localizedTitle, assetsFetchResult.count);
    if (assetsFetchResult.count > 0) {
        for (PHAsset *asset in assetsFetchResult) {
            //you have got your image type asset.
        }
    }
}

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