UIAlertController's actionSheet gives constraint error on iOS 12.2 / 12.3

L03n picture L03n · Mar 27, 2019 · Viewed 10.2k times · Source

On iOS 12.2, while using UIAlertController's actionSheet, Xcode gives constraint error. Anyone having this problem?

This same code runs on iOS 12.1 with no error.

I have tested this code on Xcode 10.2 and 10.1.

class ViewController: UIViewController {
    
    let Click : UIButton = {
        let button = UIButton(type: UIButton.ButtonType.system)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle("OK", for: .normal)
        button.tintColor = UIColor.blue
        button.addTarget(self, action: #selector(click(_:)), for: UIControl.Event.touchUpInside)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(Click)
        Click.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        Click.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    }

    
    @objc func click(_ sender: UIButton) {
        let optionMenu = UIAlertController(title: nil, message: "Choose Option", preferredStyle: .actionSheet)
        
        let deleteAction = UIAlertAction(title: "Delete", style: .default)
        let saveAction = UIAlertAction(title: "Save", style: .default)
    
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
        
        optionMenu.addAction(deleteAction)
        optionMenu.addAction(saveAction)
        optionMenu.addAction(cancelAction)
        
        self.present(optionMenu, animated: true, completion: nil)
    }

}
[LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x6000001b6ee0 UIView:0x7fe3b6513020.width == - 16   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x6000001b6ee0 UIView:0x7fe3b6513020.width == - 16   (active)>

PS:

Just to make sure that the problem is on UIAlertController, I removed everything and updated the code as below, but I received the same error:

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        let optionMenu = UIAlertController(title: "Test", message: "Choose Option", preferredStyle: .actionSheet)
        
        let deleteAction = UIAlertAction(title: "Delete", style: .default)
        let saveAction = UIAlertAction(title: "Save", style: .default)
        
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
        
        optionMenu.addAction(deleteAction)
        optionMenu.addAction(saveAction)
        optionMenu.addAction(cancelAction)
        
        self.present(optionMenu, animated: true, completion: nil)
    }
    
}

Answer

Andrei Konstantinov picture Andrei Konstantinov · Jun 3, 2019

It's a bug in iOS versions:

  • 12.2
  • 12.3
  • 12.4
  • 13.0
  • 13.1
  • 13.2
  • 13.2.3
  • 13.3
  • 13.4
  • 13.4.1
  • 13.5
  • 13.5.1
  • 13.6
  • 14.0
  • 14.1
  • 14.2

The only thing we can do is to file a bug report to Apple (I just did that and you should too).

I'll try to update answer for a new versions of iOS if the bug still will be present. Help appreciated.