Aspect ratio constraint not getting altered

Question

I have two kinds of image 1.Square and other 2. Images with ratio 3:4. And I get information about the aspect ratio of incoming image in advance(which is in currentImageAspectRatio). I want to handle both kind of images in one UIImageView.

In Storyboard

I have added both 1:1 and 3:4 constraints to my imageView, and then unchecked Installed for 3:4 constraint.

In Code

My viewDidLoad has

if currentImageAspectRatio == .square{
    // Already Square
} else {
    NSLayoutConstraint.deactivate([squareImageConstraint])
    imageView.addConstraint(threeByFourImageConstraint)
    self.view.layoutIfNeeded()
}

But this doesn't seem to work. I also tried to put same code in viewWillAppear: but that too didn't work.

I am confused if there is something wrong I am doing.

And also I need suggestion on where is the most ideal place to do such stuff like altering constraints(I was thinking to use viewWillLayoutSubviews).

you have added threeByFourImageConstraint and again said that you have uncheked it. i don't get it. dude — elk_cloner, Jun 09 '17 at 06:00
Try this code in `viewDidAppear` or you are thinking in right way you can do it in `viewDidLayoutSubviews` also — Piyush, Jun 09 '17 at 06:01
I had previously tried calling the code from `viewWillLayoutSubviews`, `viewWillAppear ` and `viewDidLoad` and finally now it worked by calling it from `viewDidLayoutSubviews`. — Nikhil Manapure, Jun 09 '17 at 06:11
Should I delete this question as I think it was my mistake?? — Nikhil Manapure, Jun 09 '17 at 06:12

score 0 · Accepted Answer · answered Jul 03 '17 at 09:44

0

Calling the same code from viewDidLayoutSubviews worked for me.

answered Jul 03 '17 at 09:44

Nikhil Manapure

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Aspect ratio constraint not getting altered

1 Answers1