[objective-c] "Application tried to present modally an active controller"?

I just came across a crash showing a NSInvalidArgumentException with this message on an app which wasn't doing this before.

Application tried to present modally an active controller UITabBarController: 0x83d7f00.

I have a UITabBarController which I create in the AppDelegate and give it the array of UIViewControllers.

One of them I want to present modally when tapped on it. I did that by implementing the delegate method

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController

If that view controller is of the class of the one I want to present modally, I return NO and do

[tabBarController presentModalViewController:viewController animated:YES];

And now I'm getting that error, which seems to mean that you can't present modally a view controller that is active somewhere else (in the tabbar...) I should say I'm on XCode 4.2 Developer Preview 7, so this is iOS 5 (I know about the NDA, but I think I'm not giving any forbidden details). I currently don't have an XCode installation to test if this crashes compiling against the iOS4 SDK, but I'm almost entirely sure it doesn't.

I only wanted to ask if anyone has experienced this issue or has any suggestion

Just remove

[tabBarController presentModalViewController:viewController animated:YES];

and keep

[self dismissModalViewControllerAnimated:YES];

The same problem error happened to me when I tried to present a child view controller instead of its UINavigationViewController parent

I have the same problem. I try to present view controller just after dismissing.

[self dismissModalViewControllerAnimated:YES];

When I try to do it without animation it works perfectly so the problem is that controller is still alive. I think that the best solution is to use dismissViewControllerAnimated:completion: for iOS5

I had same problem.I solve it. You can try This code:

[tabBarController setSelectedIndex:1];
[self dismissModalViewControllerAnimated:YES];

In my case, I was presenting the rootViewController of an UINavigationController when I was supposed to present the UINavigationController itself.

Instead of using:

self.present(viewControllerToPresent: UIViewController, animated: Bool, completion: (() -> Void)?)

you can use:

self.navigationController?.pushViewController(viewController: UIViewController, animated: Bool)

In my case i was trying to present the viewController (i have the reference of the viewController in the TabBarViewController) from different view controllers and it was crashing with the above message. In that case to avoid presenting you can use

viewController.isBeingPresented

!viewController.isBeingPresented {
          // Present your ViewController only if its not present to the user currently.
}

Might help someone.