CODEWITHSUNDEEP
iosswiftxcode
Huang Runhua
Huang Runhua

Reputation: 156

How to fix "ActionSheet of UIAlertController has the conflict constraint" error in Swift

My code runs successfully on iOS12.1, but recently when I update the version of iOS, Xcode, macOS to iOS12.2 Xcode10.2 and macOS10.14.4, there is something wrong in my project. There is no problem with my app interface, but when I open the action sheet, it tells me that my constraints are conflicting. How can I solve it? this is my UI this is the warning in Xcode

I reset the constraints of the interface, but no matter how I get it, I still have the same problem.

Those are my codes, once I tap the button, the action sheet occurred, and Xcode tells me that my constraints are conflicting 

@IBAction func newToDoBarButtonTapped(_ sender: UIBarButtonItem) {

        let alertController = UIAlertController(title: "New or Edit", message: nil, preferredStyle: .actionSheet)
        let newToDoAlertAction = UIAlertAction(title: "New Item", style: .default, handler: {(_) in
            let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let registerVC = mainStoryboard.instantiateViewController(withIdentifier: "NewToDoStoryboard") as! ToDoViewController
            self.navigationController?.pushViewController(registerVC, animated: true)
        })

        let editInformationOfListAction = UIAlertAction(title: "Edit Information", style: .default, handler: {(_) in
            let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let registerVC = mainStoryboard.instantiateViewController(withIdentifier: "EditStoryboard") as! EditItemTableViewController
            self.navigationController?.pushViewController(registerVC, animated: true)
        })

        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

        alertController.addAction(newToDoAlertAction)
        alertController.addAction(editInformationOfListAction)
        alertController.addAction(cancelAction)

        self.present(alertController,animated: true,completion: nil)
    }

I except there is no warning of the conflicting constraints.

Upvotes: 2

Views: 880

Answers (1)

E.Coms
E.Coms

Reputation: 11537

You may have to manually silent the constraint alert.

   @IBAction func newToDoBarButtonTapped(_ sender: UIBarButtonItem) {
     ...
    self.present(alertController,animated: true,completion: nil)

   alertController.view.subviews.flatMap({$0.constraints}).filter{ (one: NSLayoutConstraint)-> (Bool)  in
      return (one.constant < 0) && (one.secondItem == nil) &&  (one.firstAttribute == .width)
   }.first?.isActive = false

  }

Upvotes: 4

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