changing constraints at runtime in swift

Question

I\'m really very weak in constraints part of ios. I have gone through many reference link as shown below but still not able solve my issue.

Hide autolayout UIView : How

Answer 1

I use outlets for constraints set on the storyboard, for divs between buttons (using old ways to set dynamic layouts). So, for large screens (iPhone 6 and above), I update the values of fixed heights (app only viewed in portrait mode). What worked for me is:

constHeightlogo.constant = 140 //old value = 72
///set any other updates here then force the view
self.view.layoutIfNeeded()

Worked like a charm.

See related here:

Update the constant property of a constraint programmatically in Swift?

Answer 2

just make the outlet of height of both UIView and use constant property to change the height constraints like...

if conditionfails{
     heightconstOfView1.constant = 0
}
else{
    heightconstOfView2.constant = 0
}