ios判断设备是iphone还是ipad

1. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions  

2. {  

3.    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];  

4. // Override point for customization after application launch.

5. if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {  

6.        self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController_iPhone"bundle:nil] autorelease];  

7.    } else {  

8.        self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController_iPad"bundle:nil] autorelease];  

9.    }  

10.    self.window.rootViewController = self.viewController;  

11.    [self.window makeKeyAndVisible];  

12. return YES;  

13. }