How to create button action on cell click in a collection view - ios

Question

Actually I have taken a two collection view controllers. In first collection view controller iIhave passed array of images.on the click of the one image ,i want to display another collection view controller.how to do this...please suggest me .
- (void)viewDidLoad
{
[super viewDidLoad];
recipeImages = [NSArray arrayWithObjects:#"angry_birds_cake.jpg", #"creme_brelee.jpg", #"egg_benedict.jpg", #"full_breakfast.jpg", #"green_tea.jpg", #"ham_and_cheese_panini.jpg", #"ham_and_egg_sandwich.jpg", #"hamburger.jpg", #"instant_noodle_with_egg.jpg", nil];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return recipeImages.count;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"photo-frame.png"]];
for (UIView *view in cell.subviews) {
if ([view isKindOfClass:[UILabel class]]) {
[view removeFromSuperview];
}
}
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(5, 0, 150, 170)];//Set the frame as per your requirement.
label.font=[UIFont systemFontOfSize:10];
[label setText:[NSString stringWithFormat:#"%#",[categoryArray objectAtIndex:indexPath.row]]];
[cell addSubview:label];
//NSLog(#"hiiiii");
return cell;
}

Answer 1

If you would like to show the second collection view in another view controller, you would just push the view controller with the collection view in it in didSelectItemAtIndexPath:.
If you would like to show the second collection view in the same view controller, you could create two collection views and set the second to hidden. Then in didSelectItemAtIndexPath:, you could set the second collection view to show and the first to hidden. This would be done through collectionView.hidden = YES or NO.

Answer 2

For displaying another UICollectionViewController on the click of an item in another UICollectionViewController, you have to use the didSelectItemAtIndexPath function. You can do it like this :
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
int itemNo = (int)[indexPath row]+1;
CollectionViewCell *selectedCell = (CollectionViewCell*)[collectionView cellForItemAtIndexPath:indexPath];
switch (itemNo) {
case 1:
{
//perform segue to another UICollectionViewController.
}
case 2:
{
//perform segue to another UICollectionViewController.
}
.
.
.
}
}
Here itemNo is the item(Cell), that is clicked from the Collection View. If you have to redirect to the same UICollectionViewController for all item clicks, the you won't be needing the switch and you can do it directly with Segue.
Hope this helps.