如何在添加到keyWindow的视图上方显示模态？

问：

我添加了一个视图，因为我们希望它与导航栏重叠。[[UIApplication sharedApplication] keyWindow]

现在，我们想点击视图上的按钮并以模式打开窗口，最好是使用 .有没有办法使这个模态视图出现在keyWindow视图的上方（在z轴上）？presentViewController

我的回答

我最终将我的第一个自定义添加到 .这允许 重叠导航栏和标签栏。UIViewControllerself.tabBarControllerUIViewController

然后我用来呈现模态，它在 z 轴上高于其他一切。[self.navigationController presentViewController:animated:completion]

下面是将 添加到UIViewControllerself.tabBarController

        MyCustomViewController * overlayView = [[MyCustomViewController alloc]
                      initWithNibName:@"MyCustom"
                      bundle:nil];

        UIViewController *parentViewController = self.tabBarController;
        [modalView willMoveToParentViewController:parentViewController];

        // set the frame for the overlayView
        overlayView.view.frame = parentViewController.view.frame;

        [parentViewController.view addSubview: overlayView.view];

        [parentViewController.view needsUpdateConstraints];
        [parentViewController.view layoutIfNeeded];

        // Finish adding the overlayView as a Child View Controller
        [parentViewController addChildViewController: overlayView];
        [overlayView didMoveToParentViewController:parentViewController];