如何让UIScrollView适合其内容大小，直到滚动自动布局之前的最大值

Question

I want to create a UIScrollView in autolayout that will fully contain it's content (does not scroll) until the content is a certain size (say 400), and then it starts scrolling.

So I have my views laid out like this

If I set Scroll View.height = ContentView.height , then the scrollview expands to fit all of the content. So far so good.

Now if I try to set a max height via Scroll View.height <= 400 , what ends up happening is it sets the ContentView.height as well (due to Scroll View.height = ContentView.height ) and the text becomes cut off and it doesn't scroll

So is this even possible to do with autolayout? This seems easy to do with frames but I'd like a solution in autolayout.

Here's the sample project if you'd like to play around yourself - https://github.com/iwllyu/content-hugging-uisv-with-max

Answer 1

You have got everything else right. But for this to work you should set priority of Scroll View.height = ContentView.height constraint less than the compression resistance priority of your subview (ie UILabel here).

So in your case anything below 750 will work.