- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
if ([self.window.rootViewController.presentedViewController isKindOfClass: [SecondViewController class]])
{
SecondViewController *secondController = (SecondViewController *) self.window.rootViewController.presentedViewController;
if (secondController.isPresented)
return UIInterfaceOrientationMaskAll;
else return UIInterfaceOrientationMaskPortrait;
}
else return UIInterfaceOrientationMaskPortrait;
}
And for Swift
func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow) -> Int {
if self.window?.rootViewController?.presentedViewController? is SecondViewController {
let secondController = self.window!.rootViewController.presentedViewController as SecondViewController
if secondController.isPresented {
return Int(UIInterfaceOrientationMask.All.toRaw());
} else {
return Int(UIInterfaceOrientationMask.Portrait.toRaw());
}
} else {
return Int(UIInterfaceOrientationMask.Portrait.toRaw());
}
}
For more details check this link