IOSLauncher:
@Override
public void iosPickImage() {
        UIViewController controller = ((IOSApplication) Gdx.app).getUIViewController();
        UIImagePickerController imagePicker = new UIImagePickerController();
        //UIImagePickerControllerDelegateAdapter delegate = new UIImagePickerControllerDelegateAdapter();
        imagePicker.setSourceType(UIImagePickerControllerSourceType.PhotoLibrary);
        imagePicker.setDelegate(new UIImagePickerControllerDelegateAdapter() {

            @Override
            public void didFinishPickingMedia(UIImagePickerController picker, UIImagePickerControllerEditingInfo info) {
                UIImage selectedImage = info.getOriginalImage();
                File file = new File(Gdx.files.getExternalStoragePath() + "iosImage1.png");

                Gdx.app.log("HERE:" , "1");

                selectedImage.toPNGData().write(file, true);
                picker.dismissViewController(true, null);
            }

            @Override
            public void didCancel(UIImagePickerController picker) {
                picker.dismissViewController(true, null);
            }
        });
            controller.presentViewController(imagePicker, true, null);
    }

__________________________________
public class MerchScreen implements Screen, IOSImages{

FileHandle fileIOS1 = Gdx.files.external("iosImage1.png");
 public MerchScreen(MainClass game) {
this.gallery = game.gallery;

if(fileIOS1.exists()) {
            imageSelected1 = new Texture(fileIOS1);
        }

 @Override
    public void render(float delta) {
        camera.update();
        game.batch.setProjectionMatrix(camera.combined);

        game.batch.begin();
        game.batch.draw(background, 0, 0, screenWidth, screenHeight);

        if(fileIOS1.exists()){
            imageSelected1 = new Texture(fileIOS1);
            selected1 = new TextureRegionDrawable(new TextureRegion(imageSelected1));
            style2.up = skin.newDrawable(skin.newDrawable(selected1));
            style2.down = skin.newDrawable(skin.newDrawable(selected1));
        }


public void show() {

boxImage.addListener(new ChangeListener() {
                @Override
                public void changed(ChangeEvent event, Actor actor) {
                    IOSImages.pickImage();
                }
            });