Setting Dynamic Height to UIScrollView Swift

We can use auto layout, where we use a content view in scrollview, which can be pinned to the scrollview and the height and width constraints given equal to the main view. Then if we want the height to vary dynamically we can give height constraint a low priority compared to the others and hence the content view's height will increase based on its intrinsic size, because of its sub views.

Reference Links:

1) https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/AutolayoutPG/WorkingwithScrollViews.html#//apple_ref/doc/uid/TP40010853-CH24-SW1

2) https://www.youtube.com/watch?v=6J22gHORk2I

First you need set a subview height constraint of 0, then calculate data height (which you want to set in subview), and simply assign subview.heightConstraint.constant = data.height, then you need to set scrollView.contentsize which is based on subview height:

self.scrollView.contentSize = CGSize(width: self.scrollView.contentSize.width, height: self.subViewHeight.constant)

for me this this trick worked (Swift 4)

scrollView.layoutIfNeeded()
scrollView.isScrollEnabled = true
scrollView.contentSize = CGSize(width: self.view.frame.width, height: scrollView.frame.size.height)