CODEWITHSUNDEEP
iosobjective-cuicollectionview
Niharika
Niharika

Reputation: 1198

How to change button image for all UICollectionView cells?

I am using a UICollectionView to display some data. I am having one button on each cell. Now on the button click of at some specific index(ex: 9) I want to change buttons image for all cells. Can some one suggest how to do that?

Upvotes: 0

Views: 660

Answers (2)

KrishnaCA
KrishnaCA

Reputation: 5695

We can simply add the logic in cellForItemAtIndexPath like this. 

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

     UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];

     if (self.buttonClicked) { // boolean check 
         [cell.newButton setImage:buttonClickedImage]; 
     }else {
         [cell.newButton setImage:buttonNotClickedImage];
     }

     return cell;
}

After clicking the button, you can also just reload all visible cells. 

[self.collectionView reloadItemsAtIndexPaths:self.collectionView.indexPathsForVisibleItems];

Feel free to suggest edits to make this answer better :)

Upvotes: 0

mattsson
mattsson

Reputation: 1349

I would loop through all the visible cells and change the image. For example:

for (CustomCellClass *cell in collectionView.visibleCells) {
    [cell.button setImage:[UIImage imageNamed:@"new image"] forState:UIControlStateNormal];
}

For off-screen cells, I would make sure to set the new image in collectionView:cellForItemAtIndexPath: as the user scrolls to those cells.

Upvotes: 1

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