iOS PhotoKit:获取除全景图之外的所有智能相册 [英] iOS PhotoKit: Fetch all smart albums except panoramas

问题描述

我正在使用以下代码来获取所有智能相册:

I am using the follow code to fetch all smart albums:

PHAssetCollection.fetchAssetCollections(with: PHAssetCollectionType.smartAlbum, subtype: PHAssetCollectionSubtype.albumRegular, options: nil)

如何从此获取中排除Panoramas智能相册?我假设我必须使用options参数来添加谓词，但是我不知道如何格式化谓词.

How can I exclude the Panoramas smart album from this fetch? I assume I have to add a predicate using the options param, but I don't know how to format the predicate.

推荐答案

如果要排除Panorama，请考虑使用数组并仅获取所需的集合.换句话说，将集合列入白名单.或者，您可以枚举集合，并排除全景图.白名单还可以让您控制集合的顺序.

If you want to exclude the Panoramas, consider using an array and fetching only the collection you need. In other words, whitelisting collections. Or you can enumerate through the collections and exclude the Panoramas. Whitelisting also gives you control of the order of collections.

var smartAlbums: [PHAssetCollection] = []
let subtypes:[PHAssetCollectionSubtype] = [
    // all photos collection
    // .smartAlbumUserLibrary,
   .smartAlbumFavorites,
   .smartAlbumPanoramas,
   .smartAlbumLivePhotos,
   .smartAlbumBursts,
   .smartAlbumDepthEffect,
   .smartAlbumLongExposures,
   .smartAlbumScreenshots,
   .smartAlbumSelfPortraits
]

smartAlbums = fetchSmartCollections(with: .smartAlbum, subtypes: subtypes)

private func fetchSmartCollections(with: PHAssetCollectionType, subtypes: [PHAssetCollectionSubtype]) -> [PHAssetCollection] {
    var collections:[PHAssetCollection] = []
    let options = PHFetchOptions()
    options.includeHiddenAssets = false

    for subtype in subtypes {
        if let collection = PHAssetCollection.fetchAssetCollections(with: with, subtype: subtype, options: options).firstObject {
            collections.append(collection)
        }
    }

    return collections
}

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