func getAssets(assets: [PHAsset]) {
  // if you implement this delegate function, you will receive assets
}

func dismiss() {
  //  Photo browser dismiss
  // ex)
  //  dismiss(animated: true) {
  //   do something
  //  }
}

let vc = CSPhotoGalleryViewController.instance
vc.delegate = self
vc.CHECK_MAX_COUNT = 20
vc.horizontalCount = 3
vc.mediaType = .image //  or .video
present(vc, animated: true)

public class CSPhotoDesignManager {
    public static var instance: CSPhotoDesignManager = CSPhotoDesignManager()

    //  Photo collection view
    public var photoGalleryBackButtonImage: UIImage?

    //  Photo detail view
    public var photoDetailBackButtonImage: UIImage?

    //  OK Button Title
    public var photoGalleryOKButtonTitle: String?

    //  Check Image
    public var photoGalleryCheckImage: UIImage?

    //  UnCheck Image
    public var photoGalleryUnCheckImage: UIImage?

    //  When OK Button is hidden, CheckCountLabel and CheckBtn is hidden  
    public var isOKButtonHidden = false
}