Disable a Button

The boolean value for NO in Swift is false.

button.isEnabled = false

should do it.

Here is the Swift documentation for UIControl's isEnabled property.

If you want the button to stay static without the "pressed" appearance:

// Swift 2
editButton.userInteractionEnabled = false 

// Swift 3
editButton.isUserInteractionEnabled = false 

---

Remember:

1) Your IBOutlet is --> @IBOutlet weak var editButton: UIButton!

2) Code above goes in viewWillAppear