How can i use notification & alert in swift?-CodePudding

    @IBAction func tapDeleteButton(_ sender: UIButton) {
        let alert = UIAlertController(title:"Are you sure?",message: "Do you really want to delete?",preferredStyle: UIAlertController.Style.alert)
                    let cancle = UIAlertAction(title: "Cancel", style: .default, handler: nil)
                    alert.addAction(cancle)
                    present(alert, animated: true, completion: nil)
        let delete = UIAlertAction(title: "Delete", style: .destructive){(_) in
            let uuidString = self.diary?.uuidString
            NotificationCenter.default.post(name: NSNotification.Name("deleteDiary"), object: uuidString, userInfo: nil)
        }
                    alert.addAction(delete)
                    present(alert, animated: true, completion: nil)
    }

hello. I'm studying swift while making a diary app.

But I'm stuck creating a delete button for a cell.

I get an error when I tap delete in alert.

How can I handle delete with notification and alert in there??

CodePudding user response：

The problem is, you are trying to display another UIAlertController on the currently presented UIAlertController.

You are presenting your UIAlertController twice.

Remove the line present(alert, animated: true, completion: nil) under let alert = ....

CodePudding user response：

The issue is because, You have presented the alert twice

Try this:

@IBAction func tapDeleteButton(_ sender: UIButton) {
let alert = UIAlertController(title:"Are you sure?",message: "Do you really want to delete?",preferredStyle: UIAlertController.Style.alert)

let cancle = UIAlertAction(title: "Cancel", style: .default, handler: nil)
let delete = UIAlertAction(title: "Delete", style: .destructive){(_) in
    let uuidString = self.diary?.uuidString
    NotificationCenter.default.post(name: NSNotification.Name("deleteDiary"), object: uuidString, userInfo: nil)
}

alert.addAction(cancle)
alert.addAction(delete)
present(alert, animated: true, completion: nil)

}