Perform Segue After UIalertcontroller Is Dismissed

Perform segue after UIAlertController is dismissed

The problem is in this code:

let okay = UIAlertAction(title: "Yes, please.", style: .default, handler: {_ in
    self.performSegue(withIdentifier: "segue", sender: nil)
})

The handler: is not a completion handler. It runs before the alert is (automatically) dismissed. Thus, you are starting the segue while the alert is still present.

If you prefer not to use delay (though I see nothing wrong with that approach), what I would try is this:

let okay = UIAlertAction(title: "Yes, please.", style: .default, handler: {_ in
    CATransaction.setCompletionBlock({
        self.performSegue(withIdentifier: "segue", sender: nil)
    })
})

Alert Blocking Segue-iOS

Add a completion handler to your alert's dismiss button like this

let alert = UIAlertController(title: "Alert", message: "Content Here", preferredStyle: .alert)

// add textfield or whatever you need

alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
    self.performSegue(withIdentifier: "secondVC", sender: self)
}))
present(alert, animated: true)

The completion handler will be called when the user presses the "OK" button on the alert.

Show UIAlert before unwinding segue

Instead of perform the segue directly you need to show your UIAlertViewController first and according to the user response execute your segue or not

@IBAction func showAlertViewController(){
    let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

    let replyAction = UIAlertAction(title: "Delete Draft", style: .destructive, handler: nil)

    let replyAllAction = UIAlertAction(title: "Save Draft", style: .default) { (action) in
        //Do whatever you need here
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
        self.performSegue(withIdentifier: "cancelDraft", sender: action) //executing the segue on cancel
    }
    alertController.addAction(replyAllAction)
    alertController.addAction(replyAction)
    alertController.addAction(cancelAction)
    present(alertController, animated: true, completion: nil)

}

After this you only need to change the unwind segue action to execute this method, and your segue will be executed if you press cancel in the UIAlertViewController via self.performSegue(withIdentifier: #<SegueIdentifier>, sender: #<sender>)

UIAlertController keeps segue from performing (window is not equal to view’s window“)

You can't present an alert and do a segue at the same time use DispatchQueue.main.asyncAfter to mook a waiting

private func setUpDialog() {
    alertMessage = "Logging in"
    alert = UIAlertController(title: "Please wait", message: alertMessage, preferredStyle: UIAlertController.Style.alert)
    self.present(alert, animated: true, completion: nil)
    DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
        self.alert.dismiss(animated: true, completion: {
            self.performSegue(withIdentifier: "segue12", sender: self)
        })
    }
}

How do I dismiss a UIAlertController when the return key is tapped in Swift?

Instead of calling dismiss on myAlertController, try calling dismiss on your AlbumViewController. I've edited your textFieldShouldReturn function below:

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    let TFNameToSave = textField.text
    self.save(name: TFNameToSave!)
    self.albumCollectionView.reloadData()
    textField.resignFirstResponder()
    // ViewController should dismiss the alert controller
    dismiss(animated: true) {
        self.performSegue(withIdentifier: "segueForTF", sender: self)
        print("Album name has been inputted; return button tapped.")
    }
    return true
}

From the docs:

The presenting view controller is responsible for dismissing the view
controller it presented.

Here, the presenting view controller should be the AlbumViewController and the presented is myAlertController.

Hope that works!

Present a ViewController, dismiss it, and then segue into another View

Perform segue on completion of dismiss of UIImagePickerController

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    // your code
    self.dismissViewControllerAnimated(true, completion: {
        self.performSegueWithIdentifier("SegueIdentifier", sender: self)
    })
}

Note: With sender I have passed current Controller object you can any object that you want.

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