UICollectionView scrollview has margin from top and bottom

Question

Scroll indicators in UICollectionView starts after from some points from top and ends before that many points from bottom. I mean it has top and bottom margin from UICollectionView's top and bottom.

Should not it start from top and end at bottom of UICollectionView?

I checked that contentInset.top on UICollectionView and sectionInset.top on UICollectionViewFlowLayout are 20.0 and 0.0, respectively.

See below image. Content start from more than 20.0 pts(which is top inset value) from top.

enter image description here

@friedegg-bacon-sandwich Actually it was `64.0`. I was getting `0.0` because I was logging in `viewWillAppear:` method. — Geek, Apr 21 '14 at 11:35

score 4 · Answer 1 · answered Apr 21 '14 at 11:39

I solved by setting value of below properties to UIEdgeInsetsZero,

// Set contentInset and scrollIndicatorInset to UIEdgeInsetsZero.
self.tournamentCollection.contentInset = UIEdgeInsetsZero;
self.tournamentCollection.scrollIndicatorInsets = UIEdgeInsetsZero;

Value of contentInset.top and scrollIndicatorInsets.top was 64.0. Similarly for bottom. It was causing the contents to start 64.0 pts from top.

Note that you should check above properties' values only after layout pass is executed, otherwise you might get 0.0 as a value. This was the case with me. You should check in viewDidLayoutSubview: methods.

I'm glad you found your solution. Don't forget to mark this as the answer also. — huong, Apr 22 '14 at 02:15

score 2 · Answer 2 · answered Nov 14 '14 at 14:19

2

problem in translucent status bar and in your case also nav bar

if your collectionView starts right under nav bar when rendering to it added value to the top of the physical screen (64)

In its Projects I encountered a curious situation. A nav bar off translucency, but as soon as I hide it in one of the screens, then added to collectionView magic 20 pixels. Yes, yes, this is a translucent status bar had to take advice Geek

answered Nov 14 '14 at 14:19

kolbasek

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I gave you a vote because you showed what is causing this mysterious offset to occur in the first place. Thanks! – Indi Nov 17 '14 at 23:40

score 1 · Answer 3 · edited May 23 '17 at 12:15

1

Building on @kolbasek's answer, this other question's answer shows how to correct it in Storyboard editor ("...select the ViewController, and then untick 'Adjust Scroll View Insets'")

edited May 23 '17 at 12:15

Community

1
1

answered Nov 17 '14 at 23:50

Indi

544
2
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UICollectionView scrollview has margin from top and bottom

3 Answers3