How to create an empty iOS application

1

Dear MOE teams,
I want to create an empty iOS application, just like the following code, How can I do this? because MOE declare a UIWindow, and setWindow,…
I want to create the UIWindow by myself. But it seems MOE create the window for me, what should I do?
Do I need to delete the luanchScreen and main.storyborad?

thanks!

package ttt;

import apple.NSObject;
import apple.coregraphics.struct.CGRect;
import apple.foundation.NSDictionary;
import apple.uikit.UIApplication;
import apple.uikit.UIColor;
import apple.uikit.UILabel;
import apple.uikit.UIScreen;
import apple.uikit.UIViewController;
import apple.uikit.UIWindow;
import apple.uikit.c.UIKit;
import apple.uikit.enums.UITextAlignment;
import apple.uikit.protocol.UIApplicationDelegate;

import org.moe.natj.general.Pointer;
import org.moe.natj.general.ann.RegisterOnStartup;
import org.moe.natj.objc.ann.Selector;

@RegisterOnStartup
public class Main extends NSObject implements UIApplicationDelegate {

public static void main(String[] args) {
    UIKit.UIApplicationMain(0, null, null, Main.class.getName());
}

@Selector("alloc")
public static native Main alloc();

protected Main(Pointer peer) {
    super(peer);
}

private UIWindow window;

@Override
public boolean applicationDidFinishLaunchingWithOptions(UIApplication application, NSDictionary launchOptions) {
    //application.setStatusBarHidden(true);
    CGRect rect = UIScreen.mainScreen().applicationFrame();
    UIWindow nwindow = UIWindow.alloc().initWithFrame(rect);
    nwindow.setBackgroundColor(UIColor.blueColor());
    rect.origin().setX(0);
    rect.origin().setY(0);
    UILabel label = UILabel.alloc().initWithFrame(rect);
    label.setText("Hello,world!");
    label.setTextAlignment(UITextAlignment.Center);
    nwindow.addSubview(label);

    nwindow.makeKeyAndVisible();
    nwindow.setRootViewController(UIViewController.alloc().initWithNibNameBundle(null, null));
    return true;
}

@Override
public void setWindow(UIWindow value) {
    window = value;
}

@Override
public UIWindow window() {
    return window;
}

}