仅从资产集合类型 PHAssetCollectionTypeSmartAlbum 中获取类型为 PHAssetMediaTypeImage 的照片

Question

我正在使用照片框架来获取 iOS8 中的相册列表。我可以使用

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

这为我提供了包括视频在内的所有智能相册的列表。如何从此列表中过滤掉视频。我只需要图像。

帮助将不胜感激。谢谢

Answer 1

您应该设置提取选项，它有一个属性 predicate，可用于过滤视频。下面是一个这样做的例子。

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.
        }
    }
}

Answer 2

要在 swift 中做同样的事情：

let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.Image.rawValue)

仅从资产集合类型 PHAssetCollectionTypeSmartAlbum 中获取类型为 PHAssetMediaTypeImage 的照片

Fetch only photos of type PHAssetMediaTypeImage form asset collection type PHAssetCollectionTypeSmartAlbum

ios

photolibrary

photokit

phasset