判断用户界面是ipad的还是phone的代码

- (void)applicationDidFinishLaunching:(UIApplication *)application { Nsstring *nibTitle = @"PadContent";     if (UI_USER_INTERFACE_IdioM() == UIUserInterfaceIdiomPhone) { nibTitle = @"PhoneContent";     }     [[NSBundle mainBundle] loadNibNamed:nibTitle owner:self options:nil];          [self.window addSubview:self.contentController.view]; [window makeKeyAndVisible]; }