iOS - Find top constraint for a view?

Question

I am trying to find the top constraint of the view in code. The top constraint is added in storyboard, and I don\'t want to use an IBOutlet.

Logging the value of the

Answer 1

I write a small extension in Swift:

extension UIButton {
    var topConstraints: [NSLayoutConstraint]? {
        return self.constraints.filter( { ($0.firstItem as? UIButton == self && $0.firstAttribute == .top) || ($0.secondItem as? UIButton == self && $0.secondAttribute == .top) })
    }
}