Styjun

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 remove everything and update the code as below but 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)
 

It's a new bug in iOS versions:

• 12.2


• 12.3


• 12.4


• 13 beta 2

The only thing we can do is to file a bug report to Apple (just did that).

I'll try to update answer for a new version(s) of iOS when it come out.