有没有办法检测出现了多少模态视图控制器？

Question

在iOS中，呈现modalViewController非常简单：

[self presentModalViewController:controller animated:YES];

或者：

[[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentModalViewController:controller animated:YES];

在modalViewController（例如navigationController）内，您可以再次展示modalViewController。有没有办法检测出现了多少模态视图控制器？否则可能挂钩presentModalViewController:animated:和dismissModalViewControllerAnimated:会是一个好主意吗？谢谢！

Answer 1

检查此问题：

Is it possible to determine whether ViewController is presented as Modal?

您可以使用该代码“爬上”您的视图，直到找到不是模态视图控制器的视图。像：

while (isModal)
{
    currentViewController = currentViewController.presentingViewController;

    ...
}

Answer 2

我想我找到了一种方法来找到最顶层的viewController，它应该有助于解决这个问题：

+ (UIViewController*)getTopMostViewController {
    UIWindow * window = [UIApplication sharedApplication].keyWindow;
    UIViewController *appRootViewController = window.rootViewController;
    UIViewController *topViewController = appRootViewController;
    while (topViewController.modalViewController != nil) {
        topViewController = topViewController.modalViewController;
    }
    return topViewController;

}