Question

用于显示实时照片

func fetchLivePhotos() {

    let options = PHFetchOptions()

    options.sortDescriptors = [ NSSortDescriptor(key: "creationDate", ascending: false) ]

    options.predicate = NSPredicate(format: "(mediaSubtype & %d) != 0",PHAssetMediaSubtype.photoLive.rawValue)

    DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {
        self.livePhotoAssets = PHAsset.fetchAssets(with: options)

        DispatchQueue.main.async {
            self.collectionView?.reloadData()
        }
    }
}

网格代码显示在
之下

 func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MediaCell", for: indexPath) as! MediaCell

        if let asset = livePhotoAssets?[indexPath.row]{
            let options = PHImageRequestOptions()
            options.isNetworkAccessAllowed = true

            let targetSize = CGSize(width: 200, height: 200)
            PHImageManager.default().requestImage(for: asset, targetSize: targetSize, contentMode: .aspectFill, options: options, resultHandler: { (image: UIImage?, info: [AnyHashable : Any]?) in
                cell.backgroundImageView.image = image
            })
        }

        cell.selectedImage.isHidden = true
        return cell
    }

为了获取视频我正在使用这个谓词

  option.predicate = NSPredicate(format: "mediaType == %i",PHAssetMediaType.video.rawValue)

但在Collectionview中都不显示

任何人都知道

感谢高级。!!!!

Answer 1

尝试从UICollectionViewDataSource协议覆盖该方法：

public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if let count = livePhotoAssets?.count {
        return count
    }
    return 0
}

也：

不要忘记将ViewController设置为表视图数据源。如果您是从storyboard创建的，请不要忘记在storyboard中附加collectionView属性。

我已经建立并完美运作。

如何显示来自库的实时照片视频并在iOS Swift的Collection-View中显示？

1 个答案: