Warning: Attempt to present View Controller on * which is already presenting

问题

I made a view controller with a UISearchController and a UITableView . There are two different kind of search you can select from the search scope buttons : groups and people. Both searches work and show results on the table. However, if you click on each cell they should direct you to different dynamic pages (a dynamic group page or a dynamic person profile page). The one for groups works, while the one for profiles doesn't. Meaning whenever I click on the a person cell from the results that I got, nothing happens and I get the following warning printed on the console :

Warning: Attempt to present <MyProject.profileView: 0x13e9df000>  on <MyProject.SearchPage: 0x142a1d8f0> which is already presenting <UISearchController: 0x142a1f7c0>

If you have any idea why this could be happening it'd be really appreciated if you could let me know.

EDIT : Here's the function that should link the cell to the different view controllers :

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        if self.searchForGroups {

            let detailCell:PFObject = self.filteredGroups.objectAtIndex(indexPath.row) as! PFObject

            let vc = self.storyboard!.instantiateViewControllerWithIdentifier("DynamicCellView") as! DynamicCellView

            vc.GroupId = detailCell.objectId!

            self.presentViewController(vc, animated: false, completion: nil)

        }else{
            //Link to use profile
            let user = self.peopleResults[indexPath.row]
            let vc = self.storyboard!.instantiateViewControllerWithIdentifier("ProfileView") as! profileView
            vc.profileId = user.objectId!
            self.presentViewController(vc, animated: true, completion: nil)
        }
    }

回答1:

I was having the same warning and this fixed it for me. You need to stop presenting the search controller so you can present other controller while you are leaving the view.

         override func viewDidDisappear(_ animated: Bool) {

                if SearchController.isActive == true {

                          SearchController.isActive = false

                 }
          }

回答2:

I was figuring the same original issue and none of this resolved it for me.

Actually you just have to dismiss the UISearchController as it is said because it is already presenting to the current view.

So, when you want to launch your action, you just have to call this :

if searchController.isActive {
    self.searchController.dismiss(animated: false) { 
        // Do what you want here like perform segue or present
    }
}

Hope this will help!

回答3:

Without the code is kind of difficult to help you. That error may be happening because you are breaking the view controller hierarchy.

The message is saying that you have 3 view controllers involved:

 SearchPage is presenting UISearchController

 profileView is not yet presented but should be presented on UISearchController or should replace it (For that UISearchController should be dismissed first)

Take in mind that a view controller can present only 1 view controller at the time but it can have several child view controllers (such as a navigation controller).

For more information you can check: https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/TheViewControllerHierarchy.html#//apple_ref/doc/uid/TP40007457-CH33-SW1

Just as a comment, its a good coding practice to start your class name with a uppercase letter ('ProfileView' instead of 'profileView')

回答4:

I hit the same error while trying to perform a segue when tapping on a search result. This isn't an ideal workaround but dismissing the searchController before performing the segue fixed it for me:

    self.searchController.dismiss(animated: false) { 
        self.performSegue(withIdentifier: "<YOUR SEGUE IDENTIFIER>", sender: cell)
    }

回答5:

I'm not sure if the above answers worked properly in previous version but in swift 5, calling dismiss will cause the segue to trigger properly but the search bar will remain active and when they dismiss the triggered segue (come back to the search page) the search bar will look active but the results will not be.

Also dismissing from viewDidDisappear() did not work properly. Here's how I did it.

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

//Do some stuff here

   if searchController.isActive{

        searchController.isActive = false

    }
    performSegue(withIdentifier: "<yourSegueIdentifierHere>", sender: nil)

}

来源：https://stackoverflow.com/questions/36731032/warning-attempt-to-present-view-controller-on-which-is-already-presenting-ui

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ios