swift 如何一次删除多个 PHAsset

Posted 2023-03-08

【中文标题】swift 如何一次删除多个 PHAsset

【英文标题】：swift How to delete multiple PHAssets at once

【发布时间】：2021-02-07 07:18:56

【问题描述】：

我想立即删除 PHAsset。我写了下面的代码，但是删除了，但是出现了选择alerts数量的问题。警报不能只出现一次吗？

     @IBAction func deleteBtnAction(_ sender: Any) 
    for (key, value) in dictionarySelectedIndexPath 
        if value 
            deletedNeededIndexPath.append(key)
        
    
    for i in deletedNeededIndexPath.sorted(by:  $0.item > $1.item) 
        sortedAlbum(true)
        guard let asset : PHAsset = self.fetchReuslt?.object(at: i.item) else  return 
        let assetArray : NSArray = [asset]
        phphotoLibrary.shared().performChanges(PHAssetChangeRequest.deleteAssets(assetArray), completionHandler: nil)
    
    AssetCollectionView.deleteItems(at: deletedNeededIndexPath)
    

我认为是因为for in。所以我重写如下，但是消息[PhotoKit] No photos access scope requirements declared for changes 出来了。这是为什么呢？

@IBAction func deleteBtnAction(_ sender: Any) 
    for (key, value) in dictionarySelectedIndexPath 
        if value 
            deletedNeededIndexPath.append(key)
        
    
    
    var assetArray : NSArray = []
    
    for i in deletedNeededIndexPath.sorted(by:  $0.item > $1.item) 
        sortedAlbum(true)
        guard let asset : PHAsset = self.fetchReuslt?.object(at: i.item) else  return 
        assetArray.addingObjects(from: [asset])

    

    PHPhotoLibrary.shared().performChanges(PHAssetChangeRequest.deleteAssets(assetArray), completionHandler: nil)
    AssetCollectionView.deleteItems(at: deletedNeededIndexPath)
    

【参考方案1】：

我这样修复了我的代码：

let assetArray : NSMutableArray = NSMutableArray()
    
    for i in deletedNeededIndexPath.sorted(by:  $0.item > $1.item) 
        guard let asset : PHAsset = self.fetchReuslt?.object(at: i.item) else  return 
        assetArray.addObjects(from: [asset])
        

    PHPhotoLibrary.shared().performChanges(PHAssetChangeRequest.deleteAssets(assetArray), completionHandler: nil)
    AssetCollectionView.deleteItems(at: deletedNeededIndexPath)

这很好用