ios - ios swift图库库性能问题，一旦加载图像/视频列表，数据来自iCloud

Question

我是 IOS 新手，我正在使用第三方库来集成我的多个图像/视频选择器。图书馆链接https://github.com/hyperoslo/Gallery

本地图像/视频显示速度足够快，但问题是一旦我使用 iCloud 包含超过 500 多张图像，它需要将近 1 分钟。第一次加载，是他们的任何解决方案减少或几乎消除加载时间。

这是我的代码快照，可能会有所帮助

class MyGalleryViewController: UIViewController,     GalleryControllerDelegate,UITabBarControllerDelegate{
let gallery = GalleryController()
override func viewDidLoad() {
super.viewDidLoad()

    openGallery()     
}
private func openGallery(){
    gallery.delegate = self
    gallery.modalPresentationStyle = .fullScreen
    present(gallery, animated: true, completion: nil)
}
//Rest of galleryController function
}

非常感谢提前。

Answer 1

您需要遵循以下步骤：

• 为 iCloud 上的图像获取 PHAsset

 PHAsset.fetchAssets(with: .image, options: PHFetchOptions())
    // Images on iCloud will be included

• 请求资产图片

let imageRequestOptions = PHImageRequestOptions()
imageRequestOptions.deliveryMode = .opportunistic
imageRequestOptions.isNetworkAccessAllowed = true // allowing iCloud image downloaded from network
imageRequestOptions.progressHandler = progressHandler // progressHandler is outer callback, may be called multiple times

PHCachingImageManager.default().requestImage(for: asset)

• 在 PHAssetImageProgressHandler 处理图片下载进度

let progressHandler: PHAssetImageProgressHandler = { (progress, _, stop, _) in
    cell.updateProgress(CGFloat(progress))
}

iCloud镜像的关键：

1. PHImageRequestOptions.isNetworkAccessAllowed
2. PHImageRequestOptions.progressHandler