iOS save photo in an app specific album

Question

I\'m creating an iOS 5 app. I want to save a photo to the device.

I want to save the photo to an album specific to my app, so I need to create the album, and then sa

Answer 1

For those looking for Eddy's answer in Objective-C.

#import

- (void)insertImage:(UIImage *)image intoAlbumNamed:(NSString *)albumName {
    //Fetch a collection in the photos library that has the title "albumNmame"
    PHAssetCollection *collection = [self fetchAssetCollectionWithAlbumName: albumName];

    if (collection == nil) {
        //If we were unable to find a collection named "albumName" we'll create it before inserting the image
        [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
            [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle: albumName];
        } completionHandler:^(BOOL success, NSError * _Nullable error) {
            if (error != nil) {
                NSLog(@"Error inserting image into album: %@", error.localizedDescription);
            }

            if (success) {
                //Fetch the newly created collection (which we *assume* exists here)
                PHAssetCollection *newCollection = [self fetchAssetCollectionWithAlbumName:albumName];
                [self insertImage:image intoAssetCollection: newCollection];
            }
        }];
    } else {
        //If we found the existing AssetCollection with the title "albumName", insert into it
        [self insertImage:image intoAssetCollection: collection];
    }
}

- (PHAssetCollection *)fetchAssetCollectionWithAlbumName:(NSString *)albumName {
    PHFetchOptions *fetchOptions = [PHFetchOptions new];
    //Provide the predicate to match the title of the album.
    fetchOptions.predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"title == '%@'", albumName]];

    //Fetch the album using the fetch option
    PHFetchResult *fetchResult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:fetchOptions];

    //Assuming the album exists and no album shares it's name, it should be the only result fetched
    return fetchResult.firstObject;
}

- (void)insertImage:(UIImage *)image intoAssetCollection:(PHAssetCollection *)collection {
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

        //This will request a PHAsset be created for the UIImage
        PHAssetCreationRequest *creationRequest = [PHAssetCreationRequest creationRequestForAssetFromImage:image];

        //Create a change request to insert the new PHAsset in the collection
        PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection];

        //Add the PHAsset placeholder into the creation request.
        //The placeholder is used because the actual PHAsset hasn't been created yet
        if (request != nil && creationRequest.placeholderForCreatedAsset != nil) {
            [request addAssets: @[creationRequest.placeholderForCreatedAsset]];
        }
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
        if (error != nil) {
            NSLog(@"Error inserting image into asset collection: %@", error.localizedDescription);
        }
    }];
}