I have a scroll view, when the view is first loaded, the size is set dynamically, but when I click on the button, the internal size of my elements changes and I need to change the internal size of the scroll, but it does not change. Someone knows how to fix it?
DispatchQueue.main.async {
var contentRect = CGRect()
for view in self.scrollView.subviews {
contentRect = contentRect.union(view.frame)
self.scrollView.contentSize = contentRect.size
}
}
If you really don't want to use auto-layout / constraints, you can call this function each time you add (or remove) a subview from the scroll view, or after you've changed the size(s) of the subview(s):
func updateContentSize() -> Void {
// this will get the right-edge of the right-most subview
let width = scrollView.subviews.map {$0.frame.maxX}.max() ?? 0.0
// this will get the bottom-edge of the bottom-most subview
let height = scrollView.subviews.map {$0.frame.maxY}.max() ?? 0.0
// set the contentSize
scrollView.contentSize = CGSize(width: width, height: height)
}
This solution is for auto-layout/constraints. You need a reference constraint to manipulate the height of the inner container view of the scrollview.
private var _constraintInnerContainerScroll:NSLayoutConstraint?
You need to set the initial height of the inner container view, suppose 700.0
private let _containerViewHeightFixed : CGFloat = 700.0
then you need to save the reference
_constraintInnerContainerScroll = _containerView.heightAnchor.constraint(equalToConstant: _containerViewHeightFixed)
_constraintInnerContainerScroll?.isActive = true
You initial view is setup and ready, now suppose you add 2 more subview of height 100.0 each, now your new inner container view height should be 700.0+200.0 = 900.0
if let const1 = _constraintInnerContainerScroll{
const1.constant = _containerViewHeightFixed + 200.0
UIView.animate(withDuration: 0.5) {
self?._containerView.layoutIfNeeded()
}else{
print("constraint reference not saved")
}
let me know if this works for you, or if this can be improved.
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