如何从UIAlertcontroller中消除模式ViewController

Question

I show a modal viewcontroller on which the user can decide to edit oder delete the presented car.

If the user wants to delete this car I present an UIAlertController with alert style to ask if he really wants to delete this car. Everything works fine. But after the user chooses " Yes " I am still in the modal viewcontroller .

How can I dismiss the modal view after the deletion?

I tried Following Code

self.parentViewController?.dismissViewControllerAnimated(true, completion: nil)

and

self.navigationController?.popViewControllerAnimated(true)

in the closure of the ok Action but both didn't worked for me. :(

Answer 1

There is no reason to write the code in

dispatch_async(dispatch_get_main_queue(), {    //write your code here

 })

The above code is used to the work in main thread. But here you are already on the main thread.

The issue here is you are calling

self.parentViewController?.dismissViewControllerAnimated(true, completion: nil)

Instead of it just write

self.dismissViewControllerAnimated(true, completion: nil)

Because you are presenting AlertController on self controller so the only one who can dismiss it is self

Answer 2

Put your code inside the

 dispatch_async(dispatch_get_main_queue(), {    //write your code here

 })

like that :

func showDeleteWarningAndDeleteEntity() {

    dispatch_async(dispatch_get_main_queue(), {  

         let deleteController = UIAlertController(title: "Delete car", message: "Are you sure?", preferredStyle: .Alert)
    let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) {
        (action) in
    }
    let okACtion = UIAlertAction(title: "Yes", style: .Destructive) {
        (action) in
        //some network stuff happens here...

        self.dismissViewControllerAnimated(true, completion: nil)
    }
    deleteController.addAction(okACtion)
    deleteController.addAction(cancelAction)
    self.presentViewController(deleteController, animated: true, completion: nil)
     })

}

Hope this will works for you