Presenting modal view controller from child view controller

Question

In my application, I am presenting a modal view controller, but I'm having issues which I believe are caused by the fact that I am presenting the view controllers from a child view controller.

The call for presentViewController: animated: is coming from a view controller which is on the stack of a navigation controller, and that navigation controller is contained in another view controller using the "Container View" in Interface Builder. This outer container view controller has a persistent banner at the top of the screen.

When the view controller is presented, it animates the scroll up, and when it gets to the top, it goes underneath the banner of the container view controller. However, once the animation finishes it appears in front again, but no interaction is possible on the part of the modal view controller that would be covered by the banner. What is the proper way to present a modal view controller from a child view controller?

EDIT:

I've tried accessing the container view controller directly, which works at first, but once the modal view controller is dismissed the container view somehow expands to fill the entire screen, overlapping the entire banner.

EDIT:

Screenshot:

The modal view controller is sliding up and appearing underneath the banner at the top, then suddenly jumping to the front.

Answer 1

You need to put these two methods in you AppDelegate and call these methods from where you want to present and dismiss modelviewconroller.

- (void)presentModelView{
    [[[[self.window rootViewController] navigationController] topViewController] presentViewController:controller animated:YES];
}

- (void)dismissModelView{
    [[[[self.window rootViewController] navigationController] topViewController] dismissViewControllerAnimated:YES completion:<#^(void)completion#>:controller animated:YES];
}

Answer 2

I also encountered the issue: when calling: dismissViewControllerAnimated from a view controller presented modally from a child view controller, the child view controller is also dismissed.

After a bit of playing around in interface builder, I've managed to solve it.

Just change the modally presented view controller Presentation style to Over Full Screen . (the default is Full Screen )

Swift

// In the viewController class you're presenting modally
self.modalPresentationStyle = .overFullScreen

Answer 3

I guess you could do something like:

[self.parentViewController presentViewController:controller animated:YES];

and if you need to present it from the parent of the parent you just call the same method on self.parentViewController.parentViewController

Answer 4

您是否尝试从ChildViewController对象中调用以下内容？

[self presentModalViewController:viewController animated:YES];

Answer 5

You need to present the view controller from a view controller above the banner view. The simplest solution would be:

[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:controller animated:YES];

Caveat: This should work in most cases, but you'll have to be careful if the views you're modally presenting will themselves present other views modally, in which case you'll get an error because this view already has a presented controller. If this is the case, you could follow the chain of presented controllers by inspecting the presentedViewController property iteratively until you find a controller in which it is nil .

Answer 6

As discussed in the comments of the question, I tried reproducing the issue as described and couldn't. I think the problem was due to a messed up presentation of a view controller, which threw the system when attempting to present the modal view controller.