Reloading subview (UICollectionview)

Question

In my ViewController I have four subviews, i.e UITableView, UICollectionView, View with UILabels, and View that displays preview image for that item.

By selecting a row in tableview, I am able to change preview image and all labels. However I can not refresh the UICollectionView data. I tried this solution but it just removes and adds views and that changes the layout and preview image disappears.

All I want to do is refresh UICollectionView contents. Is there any simpler way to do this?

score 7 · Accepted Answer · answered Dec 19 '12 at 22:55

7

Have you tried [self.collectionView reloadData]; ?

answered Dec 19 '12 at 22:55

robhasacamera

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score 1 · Answer 2 · answered Dec 19 '12 at 23:07

To refresh only a portion of the UICollectionView you could also call this:

[self.collectionView reloadItemsAtIndexPaths:@[indexPath]]

where indexPath is the cell you want to reload. You could include multiple index paths in the array as well. To reload the entire first section you could call this:

NSIndexSet *sections = [NSIndexSet indexSetWithIndex:0];
[self.collectionView reloadSections:sections];

score 0 · Answer 3 · answered Dec 19 '12 at 22:58

0

Assuming you have correctly hooked up your UICollectionView to a dataSource (UICollectionViewDataSource), you can call [myCollectionView reloadData] to make your collection view call your dataSource's methods (as below) to refresh itself:

– collectionView:numberOfItemsInSection:
– numberOfSectionsInCollectionView:
– collectionView:cellForItemAtIndexPath:
– collectionView:viewForSupplementaryElementOfKind:atIndexPath:

answered Dec 19 '12 at 22:58

tom

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Hey Tommy. Yes everything was hooked up fine and i could load data in UICollectionView when VC loads for the first time. It only did not work when i tried to change item from within that ViewController. But it worked fine with the solution below. i.e [self.collectionView reloadData];. Thanks.. – Obj-Swift Dec 19 '12 at 23:08

Reloading subview (UICollectionview)

3 Answers3