http://blog.csdn.net/wsk_123_123/article/details/51445418

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

 8+通过Photos.framework #import <Photos/Photos.h> 

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);                 }];