UIView原点不等于零

Question

I setup a view controller scene with interface builder. I add a view to my controller and add a custom class (CustomView) to it.

The view controller code

class ViewController: UIViewController {

    @IBOutlet var myCustomView: CustomView!
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func viewDidAppear(animated: Bool) {
        print(myCustomView.frame.origin)
    }

}

The question

Why the origin of myCustomView is equal to (-4.0, 64.0) and not (0, 64) ?

Answer 1

when you add the constraints,your constraints to margin remains unchecked. Because of constraints to margin it gives you a frame that starts with (-4.0,64.0) like that...

Try to pinned all your edges without constraints to margin that will solve your problem ..

For more guide about constraints to margin, check this link