iOS APP删除系统相册中选中的图片

app有一个新功能是在app中删除相册的照片。  8之前还是AssetsLibary处理

iOS 8+通过Photos.framework #import  

1.添加图片

  //首先获取相册的集合
    PHFetchResult *collectonResuts = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAny options:[PHFetchOptions new]] ;
    //对获取到集合进行遍历    
    [collectonResuts enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        PHAssetCollection *assetCollection = obj;
    //Camera Roll是我们写入照片的相册
    if ([assetCollection.localizedTitle isEqualToString:@"Camera Roll"])  {
            [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
      //请求创建一个Asset             
       PHAssetChangeRequest *assetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:[UIImage imageNamed:@"pet"]];
      //请求编辑相册              
       PHAssetCollectionChangeRequest *collectonRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
      //为Asset创建一个占位符，放到相册编辑请求中
       PHObjectPlaceholder *placeHolder = [assetRequest placeholderForCreatedAsset ];
      //相册中添加照片
                [collectonRequest addAssets:@[placeHolder]];
            } completionHandler:^(BOOL success, NSError *error) {
                NSLog(@"Error:%@", error);
            }];
       }
      }];

2.删除最后一张图片

  PHFetchResult *collectonResuts = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAny options:[PHFetchOptions new]] ;
    [collectonResuts enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        PHAssetCollection *assetCollection = obj;
        if ([assetCollection.localizedTitle isEqualToString:@"Camera Roll"])  {
            PHFetchResult *assetResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:[PHFetchOptions new]];
            [assetResult enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
               [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                   //获取相册的最后一张照片
                   if (idx == [assetResult count] - 1) {
                       [PHAssetChangeRequest deleteAssets:@[obj]];
                   }
               } completionHandler:^(BOOL success, NSError *error) {
                   NSLog(@"Error: %@", error);
               }];
            }];
        }
    }];

3.删除选中的图片

//    NSURL *url= [info objectForKey:UIImagePickerControllerReferenceURL];   
PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[url] options:nil];
    PHAsset *asset = [result lastObject];
    
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        [PHAssetChangeRequest deleteAssets:@[asset]];
    } completionHandler:^(BOOL success, NSError *error) {
                 NSLog(@"Error: %@", error);
                 }];