ricardopereira

extension PHPhotoLibrary {

    typealias PhotoAsset = PHAsset
    typealias PhotoAlbum = PHAssetCollection

    static func saveImage(image: UIImage, albumName: String, completion: (PHAsset?)->()) {
        if let album = self.findAlbum(albumName) {
            saveImage(image, album: album, completion: completion)
            return
        }

tomohisa

// add child view
    UIViewController* controller = [self.storyboard instantiateViewControllerWithIdentifier:@"test"];
    [self addChildViewController:controller];
    controller.view.frame = CGRectMake(0, 44, 320, 320);
    [self.view addSubview:controller.view];
    [controller didMoveToParentViewController:self];

// remove child view
    UIViewController *vc = [self.childViewControllers lastObject];
    [vc.view removeFromSuperview];