Swift iOS：-How将.livePhotos排除在PHFetchOptions中吗？

Question

在@matt的代码中使用UIImagePicker时，我可以防止用户在选择图像时选择.livePhoto：

let asset = info[UIImagePickerControllerPHAsset] as? PHAsset

if asset?.playbackStyle == .livePhoto { 
   // alert user this photo isn't a possibility 
}

在使用PHFetchOptions时，如何防止它们被显示，而不是在enumerateObjects回调中筛选出来？

fileprivate func fetchPhotos() {

    let fetchOptions = PHFetchOptions()
    fetchOptions.fetchLimit = 1000
    let sortDescriptor = NSSortDescriptor(key: "creationDate", ascending: false)
    fetchOptions.sortDescriptors = [sortDescriptor]

    let allPhotos = PHAsset.fetchAssets(with: .video, options: fetchOptions)

    allPhotos.enumerateObjects {
        [weak self] (asset, count, stop) in

        if asset.playbackStyle == .livePhoto {
            return
        }

        let imageManager = PHImageManager.default()
        let targetSize = CGSize(width: 350, height: 350)
        let options = PHImageRequestOptions()
        options.isSynchronous = true

        imageManager.requestImage(for: asset, targetSize: targetSize, contentMode: .aspectFit, options: options, resultHandler: {
            [weak self] (image, info) in

            if let image = image {
                self?.tableData.append(image)
            }

            if count == allPhotos.count - 1 {
                self?.collectionView.reloadData()
            }
        })
    }
}

Answer 1

您可以使用predicate属性的PHFetchOptions。如果资产的mediaSubtype属性指示它是活动照片，则设置谓词失败。

fetchOptions.predicate = NSPredicate(format: "(mediaSubtype & %ld) == 0", PHAssetMediaSubtype.PhotoLive.rawValue)