[iOS] How to get top most view controller?
+ (UIViewController *)topViewController { return [self topViewController:[UIApplication sharedApplication].keyWindow.rootViewController]; } + (UIViewController *)topViewController:(UIViewController *)rootViewController { if (rootViewController.presentedViewController == nil) { return rootViewController; } if ([rootViewController.presentedViewController isKindOfClass:[UINavigationController class]]) { UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController; UIViewController *lastViewController = [[navigationController viewControllers] lastObject]; return [self topViewController:lastViewController]; } UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController; return [self topViewController:presentedViewController]; } + (UINavigationController *)navigationController { UIViewController *topViewController = [self topVi...