Overlaying the screen with a black rectangle?

I'd like to, when my iPhone app first loads up, overlay the entire screen with a black rectangle temporarily. It would cover everything beneath it, so that everything on the screen would be black for a moment.

Anyone 开发者_Python百科know how to write the code to do this? It would help if you could specify how to remove the rectangle after an allotted time.

Thanks.

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Maybe you can do what you want with that, assuming you rectangle is an image :

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIImage *img = [UIImage imageNamed:@"black_rectangle.png"];
    UIImageView *imgView = [[UIImageView alloc] initWithImage:img];
    imgView.frame = CGRectMake(0.f, 0.f, 320.f, 480.f);
    [self.view addSubview:imgView];

    [NSTimer scheduledTimerWithTimeInterval:_YOUR_TIME_
                                     target:self
                                   selector:@selector(timerFinished:)
                                   userInfo:imgView
                                    repeats:NO];
    [imgView release];
}

- (void)timerFinished:(NSTimer *)timer
{
    UIImageView *imgView = (UIImageView *)[timer userInfo];
    [imgView removeFromSuperview];
}

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Do you mean splash screen? You can use this tutorial for this.

http://www.icodeblog.com/2009/03/18/iphone-game-programming-tutorial-part-3-splash-screen/

and btw Apple doesn't recommend using splash screen in Human Interface Guidelines