Define correctly height for UIScrollView

Question

I'm creating a application using Swift3, and i have difficult to define correctly height for UIScrollView, i'm using autolayout and create this structure:

UIScrollView
- UIView // The container view
- UIImageView // Constraint Top Edges = 20 in relation to UIView
- UITextView // Constraint Top Edges = 40 in relation to UIImageView
- UITextView // Constraint Top Edges = 20 in relation to UITextView
- UIButton // Constraint Top Edges 30 in relation to UITextView

Currently, i'm using this logic to calculate UIScrollView height

override func viewDidLayoutSubviews() {
    var scrollHeight : CGFloat = 0.0

    for view in self.containerView.subviews {
        view.layoutIfNeeded()
        scrollHeight += view.frame.size.height
    }

    // Adding height for scrollview, according to the sum of all child views
    self.scrollView.contentSize.height = scrollHeight

}

But, i can only get the views height, and them not consider the Constraints "margins", i would like know any way to calculate correct height for UIScrollView, adjusted according their content.

If you add a constraint to the last button to the bottom of the scrollview you should it have to set the size of the content manually. — agibson007, Jul 07 '17 at 11:26
@agibson007 but i don't add this constraint, only add constraint to the bottom of the uiview above — mauricio caserta, Jul 07 '17 at 11:30
Yep that’s what I meant sorry. That should work. See this answer I gave a while ago. https://stackoverflow.com/questions/42684594/ios-uiscrollview-with-dynamic-content-using-containerview-step-by-step/42685952#42685952 — agibson007, Jul 07 '17 at 11:32

score 0 · Answer 1 · answered Jul 07 '17 at 11:56

Close! Let's add the top margin for each view:

override func viewDidLayoutSubviews() {
    var scrollHeight : CGFloat = 0.0

    for view in self.containerView.subviews {
        view.layoutIfNeeded()
        scrollHeight += view.frame.size.height

        //Add the margins as well to the scrollHeight
        scrollHeight += view.layoutMargins.top
    }

    // Adding height for scrollview, according to the sum of all child views
    self.scrollView.contentSize = CGRect(x: self.scrollView.contentSize.width, y: scrollHeight)
}

score 0 · Answer 2 · answered Jul 07 '17 at 11:59

0

self.scrollview.contentsize.height = containerview.height;

answered Jul 07 '17 at 11:59

Ravi Vaishnav

36
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Define correctly height for UIScrollView

2 Answers2