setNeedsDisplay not working after adding subviews

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I added about 500 views to my viewController.view. This action took about 5 seconds on target. Now I want the screen to refresh after each subview I'm adding, so the user will see them appears one by one on screen.

I tried this in my viewController:

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    for(int i=0; i<500; i++)
    {
        //...Create aView
        [self.view addsubview:aView];
        [self.view setNeedsDisplay];
    }
}

I run it and nothing happened for 5 seconds then all views appeared at once. I made sure that [self.view setNeedsDisplay] called from the main thread context.

Any idea how to make those subviews appear one by one?

asked 49 secs ago

Yony

176

setNeedsDisplay not working after adding subviews