When i run my iPhone application it just show a white window, but when I press home button then it shows output what's wrong with it?

Question

My piece of code is...

window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
window.backgroundColor = [UIColor blackColor];  
CGRect rect = CGRectMake(0,0,320,480);

view = [ [ UIView alloc ] initWithFrame:rect ];
view.backgroundColor = [UIColor blueColor]; 
[window addSubview:view];

// Override point for customization after application launch
[window makeKeyAndVisible];

Answer 1

Delete this:

window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];