Objective-C
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window.backgroundColor = [UIColor orangeColor]; // customize ur self
}
Swift
func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool {
self.window!.backgroundColor = UIColor.orangeColor() // customize ur self
}
AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
appDelegate.window.backgroundColor = [UIColor redColor];