add subview in another subview

i use this code but nothing shows开发者_Python百科 up!!!!? help

CGRect frame = CGRectMake(0.0,0.0,480,320);
secondview=[[UIView alloc] initWithFrame:frame];

[self.view addSubview:secondview];  
[self.view bringSubviewToFront:secondview];

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Right now your view doesn't have any content. Try adding this:

[secondView setBackgroundColor:[UIColor redColor]];