How to programatically change the Width/Height of a UIImageView created via Interface Builder?

Question

I created this UIImageView in Xcode and then added an image. See the picture below :

Then I added this code to try to change the UIImageView but its not working:

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var border: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()

    let width = UIScreen.mainScreen().bounds.width   
    let height = UIScreen.mainScreen().bounds.height

    border.frame.size.width = width
    border.frame.size.height = height
}

DevKyle · Accepted Answer · 2016-09-07 04:32:39Z

1

I believe you have to do this in ViewDidLayoutSubviews, not ViewDidLoad:

override func viewDidLayoutSubviews() {



}

answered Sep 7, 2016 at 4:32

DevKyle

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4 Comments

Suhaib Over a year ago

Yup, it worked. Thank you. Just out of curiosity. I tried to use viewWillAppear() to see if I can get the same results but I didn't. Would you know why ?

DevKyle Over a year ago

If not mistaken, while your views from Storyboard exists in ViewDidLoad and ViewDidAppear, the dimensions aren't actually laid out until your viewcontroller calls ViewDidLayoutSubviews. For example, this is why you are able to change a UILabel.text in ViewDidLoad/ViewDidAppear but can't change the UILabel dimensions set in Storyboard until ViewDidLayoutSubviews. Please let me know if this doesn't answer your questions.

DevKyle Over a year ago

Also, in case you were wondering. Storyboard dimensions can be changed in ViewDidAppear(), because it is called after ViewDidLayoutSubviews. The only problem is, you will see the old dimensions which flicks to new dimensions. So the proper place to change Storyboard dimensions is in ViewDidLayoutSubviews.

Suhaib Over a year ago

thank you so much. I'm going to submit another question if you are interested in answering it

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