CODEWITHSUNDEEP
swiftuiviewuiimageviewuikit
Ricardo Alvarez Correa
Ricardo Alvarez Correa

Reputation: 387

Frame height prints 0

As the question states, when I tried to set an image view inside a UIView class, to have a corner Radius of its frame height divided by 2, it wasn't working, so I decided to print the frame height and it was 0.

The height or width for every view in this class prints 0 I don't know why... Thanks in advance for your answers.

Upvotes: 0

Views: 4148

Answers (2)

Ricardo Alvarez Correa
Ricardo Alvarez Correa

Reputation: 387

I found the problem. When calling the UI View class i wasn't passing by parameter the actual frame of this view. So when this class initializer was executed the frame was always 0.

Upvotes: 1

Christoph
Christoph

Reputation: 722

By default a view will have no size whatsoever. You have to set some sort of constraints or the view's frame.

1. Constraints: When setting constraints in viewDidLoad(), the view will not instantly gain a size. In order to read the size, you'll have to read it in another function called viewDidLayoutSubviews(). This function is called after all views were laid out. Here is an example where the view will gain the size of its parent view:

    var newView:UIView?

    override func viewDidLoad() {
        super.viewDidLoad()

        newView = UIView()

        newView!.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(newView!)

        newView!.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
        newView!.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
        newView!.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        newView!.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
    }


    override func viewDidLayoutSubviews() {
        print(newView!.frame)
    }

2. Frame: By setting the views frame directly, you can instantly read its size. Here is an example where the view's frame is set to the same bounds as its parent view:

    var newView:UIView?

    override func viewDidLoad() {
        super.viewDidLoad()

        newView = UIView()

        newView?.frame = view.bounds

        newView!.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(newView!)

        print(newView!.frame)
    }

Upvotes: 0

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