使用照片框架从照片库中删除照片

Question

我正在编写一个相册应用程序，它可以访问用户照片库中的照片、添加过滤器和删除照片。我使用照片框架删除了 PHAssetChangeRequest.deleteAssets(assetToDelete) 的资产。这里资产的class是PHAsset.

// Delete the photo from library    
@IBAction func deleteBtnPressed(_ sender: Any) {
        let assetToDelete = self.asset
        if let assetToDelete = assetToDelete
          {
            PHPhotoLibrary.shared().performChanges({
            PHAssetChangeRequest.deleteAssets(assetToDelete)
          })
        }
      }

但是这里发生了错误，"Argument type 'PHAsset' does not conform to expected type 'NSFastEnumeration'"。

所以我将 assetToDelete 的类型更改为 Xcode 建议：

PHAssetChangeRequest.deleteAssets(assetToDelete as! NSFastEnumeration)

还是不行，报错是：

Could not cast value of type 'PHAsset' to 'NSFastEnumeration'

有人知道怎么处理吗？谢谢！

Answer 1

线索在名称“资产”的复数中 - API 想要一个数组或任何其他符合 NSFastEnumeration 的集合类型，例如 Set

PHAssetChangeRequest.deleteAssets([assetToDelete] as NSArray)

https://developer.apple.com/documentation/photos/phassetchangerequest/1624062-deleteassets

Answer 2

更正确的做法应该是先从库中取：

let assetIdentifiers = assetsToDeleteFromDevice.map({ [=10=].localIdentifier })
let assets = PHAsset.fetchAssets(withLocalIdentifiers: assetIdentifiers, options: nil)
PHPhotoLibrary.shared().performChanges({
    PHAssetChangeRequest.deleteAssets(assets)
})

使用照片框架从照片库中删除照片

Deleting photo from Photo Library using Photo framework

photo

ios

swift

phasset

phphotolibrary