collectionView:cellForItemAtIndexPath: why my view has zero subviews?

Question

Please consider the following code:

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("DataItemCell", forIndexPath: indexPath) as DataItemCollectionViewCell

    println("\(cell.parametersView.subviews.count)")

    return cell
}

and the view hierarchy of the cell:

view hierarchy

I can't figure out why output is 0.

What I'm trying to achieve is to recursively loop through all descendants of parametersView.

Are you sure you've set your custom class in Identity Inspector ? — Seryozha, Nov 18 '14 at 14:50
Does Parameters View have a custom implementation or is it a plain old UIView? — A. R. Younce, Nov 18 '14 at 17:12
Is `parametersView` set as `IBOutlet`? Did you register Class in `viewDidLoad`? — gabbler, Nov 21 '14 at 03:53
I set up a quick project like this and didn't see any issues - are you programatically changing anything in the `DataItemCollectionViewCell` class? If so, could we see that class? — John Grant, Nov 21 '14 at 04:03
Are you sure you set the cell the identifier "DataItemCell"? — mengxiangjian, Nov 21 '14 at 08:17
It may be good old corrupted bundle resource. Did u try clean up/delete app? — orkenstein, Nov 21 '14 at 08:17
@gabbler Yes, it's set as `IBOutlet` in `DataItemCollectionViewCell` class. No. — Andrey Gordeev, Nov 22 '14 at 08:09
@JohnGrant No, I don't change anything programmatically in the `DataItemCollectionViewCell` class. It's basically a class, which has a lot of `IBOutlet`s — Andrey Gordeev, Nov 22 '14 at 08:10
Did you set your `IBOutlet` in storyboard? Or `DataItemCollectionViewCell` has its own xib file? — gabbler, Nov 22 '14 at 08:16
Is it possible that `parameters view` in the pic is not hooked up with `IBoutlet` property, instead one of the label is? — gabbler, Nov 22 '14 at 08:21
I set `IBOutlet` in storyboard. Parameters view is hooked up properly with `IBOutlet` — Andrey Gordeev, Nov 22 '14 at 08:33
The outlet to parametersView has to be set up properly since you're using Swift - if it wasn't, then when you access it to print out the count of the subviews, the app would crash when accessing nil in an implicitly unwrapped optional. Does the app crash if you try to access the `10 pax` label directly? — John Grant, Nov 23 '14 at 13:54
I've been trying to duplicate your issue without success - is there anything else you can show us that might help? (constraints / view controller / cell / the view controller scene?) — John Grant, Nov 23 '14 at 13:55
The app doesn't crash. Actually, there is nothing special with that view controller/cell — Andrey Gordeev, Nov 25 '14 at 02:17

score 4 · Answer 1 · answered Nov 21 '14 at 07:49

4

I try to simulate a similar project and I had the same issue (my prototype cell wasn't used). Be sure that you don't have any

    self.collectionView.registerClass(UICollectionViewCell, forCellWithReuseIdentifier: reuseIdentifier)

or

    self.collectionView.registerClass(DataItemCollectionViewCell, forCellWithReuseIdentifier: "DataItemCell"DataItemCollectionViewCell)

anywhere in your code.

Usually, there is one in the func viewDidLoad() function.

Edit:

Send me an exemple by mail, if you still have the problem.

answered Nov 21 '14 at 07:49

Florian

855
7
12

No, I don't have any `registerClass` calls – Andrey Gordeev Nov 22 '14 at 08:12
You're using prototype collectioncellview I guess? – Florian Nov 22 '14 at 10:18
Your image and label are displayed or not? – Florian Nov 23 '14 at 04:12
Yes, they are displayed just fine. – Andrey Gordeev Nov 23 '14 at 09:25
Does this work: println("\(cell.contentView.subviews.count)") – Mike Taverne Nov 25 '14 at 08:07
@MikeTaverne it returns 0 as well – Andrey Gordeev Nov 28 '14 at 01:34

score 2 · Answer 2 · edited May 23 '17 at 12:22

Well I did my own collection view and tried to replicate your problem and what I noticed it's that subviews is ignoring all the UIlabels, but if you add, for example a UIImageView, the array subviews will have it, this question had a similar problem but the solution they provided there didn't work for me.
As a workaround you could link your labels as IBOutlets to your cell prototype DataItemCollectionViewCell, I know it's far from clean, but if you're really desperate you can try that.
On a side note, I'm using Xcode Version 6.1 (6A1052d), so maybe they changed something in UILabel in this new release.

It doesn't seem that case. I tried to add `UIImageView` to `parametersView`, but got the same result: 0 subviews — Andrey Gordeev, Nov 27 '14 at 11:17

score 1 · Answer 3 · answered Nov 26 '14 at 18:44

1

It looks like your parameters view is being added as a subview of your cell but the parametersView property of the cell is not being set. Make sure your outlet is hooked up in the storyboard/xib.

I bet if you print out cell.parametersView you'll get nil.

answered Nov 26 '14 at 18:44

Lance

8,872
2
36
47

Thanks for your answer, but it's not nil. I wouldn't start bounty for such simple case :) – Andrey Gordeev Nov 27 '14 at 11:12

collectionView:cellForItemAtIndexPath: why my view has zero subviews?

3 Answers3