获取最上层的ViewController-IOS

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- (UIViewController *)topViewController{
    UIViewController *vc = UIApplication.sharedApplication.keyWindow.rootViewController;
    while (  [vc isKindOfClass:[UINavigationController class]] || [vc isKindOfClass:[UITabBarController class]] ) {
        if ( [vc isKindOfClass:[UINavigationController class]] ) vc = [(UINavigationController *)vc topViewController];
        if ( [vc isKindOfClass:[UITabBarController class]] ) vc = [(UITabBarController *)vc selectedViewController];
        if ( vc.presentedViewController ) vc = vc.presentedViewController;
    }
    return vc;
}