This is an iOS, Objective-C alternative to UIImagePickerController that looks almost exactly the same, but provides the ability to select multiple images. It's as easy to setup as UIImagePickerController and it works in both portrait and landscape orientations. It requires the addition of AssetsLibrary.framework. This code uses ARC.

Note: Using AssetsLibrary.framework will prompt users to grant access to their photos.

The easiest way to add WSAssetPickerController to your project is via CocoaPods:

pod 'WSAssetPickerController'

Alternatively you could copy all the files in the src directory into your project. Be sure 'Copy items to destination group's folder' is checked.

1. Import the header using #import "WSAssetPicker.h"
2. Create an instance of WSAssetPickerController passing an instance of ALAssetsLibrary
3. Implement the WSAssetPickerControllerDelegate protocol and set the picker's delegate
4. Present the WSAssetPickerController instance
5. You will also need to include the selection state png files: WSAssetViewSelectionIndicator.png and WSAssetViewSelectionIndicator@2x.png or make your own.

Check out the demo project for more details.

####Initialization and presentation

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
self.assetsLibrary = library;

WSAssetPickerController *controller = [[WSAssetPickerController alloc] initWithAssetsLibrary:library];
[self presentViewController:controller animated:YES completion:NULL];

- (void)assetPickerControllerDidCancel:(WSAssetPickerController *)sender
{
    // Dismiss the WSAssetPickerController.
    [self dismissViewControllerAnimated:YES completion:NULL];
}

- (void)assetPickerController:(WSAssetPickerController *)sender didFinishPickingMediaWithAssets:(NSArray *)assets
{
    // Dismiss the WSAssetPickerController.
    [self dismissViewControllerAnimated:YES completion:^{
        
        // Do something with the assets here.

    }];
}

Note: The ALAsset objects in the assets array are only valid for the lifetime of the ALAssetsLibrary instance they came from.