Possible Duplicate:
Best way to programmatically detect iPad/iPhone hardware

For example I want my view to be portrait only on iPhone and landscape on iPad.

How to detect if I'm running on iphone or iPad in this situation?

• iphone
• objective-c
• ipad
• orientation

Write this in your UIViewController:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
        return UIInterfaceOrientationIsPortrait(interfaceOrientation);
    else
        return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}