Detecting Tap on UICollectionView inside an UITableViewCell - ios

Question

I am working with the UICollectionView inside UITableViewCell. I am done with adding the contents and I am able to see the UICollectionView inside UITableViewCell.
But now I don't know how to check which cell of UICollectionView is tapped inside the which row of UITableView.
So if anybody knows how to recognize it pls help.
Thanks in advance.
#pragma mark
#pragma mark - UITableViewDelegate and UITableViewDatasource
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 15;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
CellForCollectionView *cell = [tableView dequeueReusableCellWithIdentifier:#"CellForCollectionView"];
if (cell == nil) {
cell = [[CellForCollectionView alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"CellForCollectionView"];
}
cell.categoryCollectionView.delegate = self;
cell.categoryCollectionView.dataSource = self;
[cell.categoryCollectionView registerNib:[UINib nibWithNibName:#"CollectionCellForCategory" bundle:nil] forCellWithReuseIdentifier:#"CollectionCellForCategory"];
cell.lblCategoryName.text = [NSString stringWithFormat:#" Category %d",indexPath.row];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
#pragma mark
#pragma mark - UIcollectionViewDelegate and UIcollectionViewDatasource
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return 15;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
CollectionCellForCategory *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"CollectionCellForCategory" forIndexPath:indexPath];
cell.imagCategory.layer.borderColor = [[UIColor blackColor]CGColor];
cell.imagCategory.layer.borderWidth = 1.0f;
return cell;
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
NSLog(#"%ld",(long)indexPath.row);
NSLog(#"%ld",(long)indexPath.section);
}

Answer 1

You can subclass UICollectionView and add a variable to track the indexPath of the tableViewCell
In your tableViewCell change the collectionView type to your custom collectionView
Set the variable in "cellForRowAtIndexPath" method of UITableViewDatasource
Custom collectionView:
#interface IndexedCollectionView : UICollectionView
#property (nonatomic, strong) NSIndexPath* parentIndexpath;
#end
Your custom tableViewCell (approx.)
#interface CellForCollectionView : UITableViewCell
#property (nonatomic, weak) IBOutlet IndexedCollectionView* categoryCollectionView;
#end
UITableViewDataSource method implementation:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
CellForCollectionView *cell = [tableView dequeueReusableCellWithIdentifier:#"CellForCollectionView"];
if (cell == nil) {
cell = [[CellForCollectionView alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"CellForCollectionView"];
}
cell.categoryCollectionView.delegate = self;
cell.categoryCollectionView.dataSource = self;
[cell.categoryCollectionView registerNib:[UINib nibWithNibName:#"CollectionCellForCategory" bundle:nil] forCellWithReuseIdentifier:#"CollectionCellForCategory"];
cell.lblCategoryName.text = [NSString stringWithFormat:#" Category %d",indexPath.row];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.categoryCollectionView.parentIndexpath = indexPath;
return cell;
}

Answer 2

A bit off-topic, but in case someone has the same problem as myself having collection view cells touch inside tableview work and reached this question looking for an answer :
It does work with all the default settings. So, make sure you don't have another touch gesture in your view controller (such as a tap gesture like me) blocking the touch from reaching the collection view cell.
If you have such a gesture recognizer, and you want to keep it, you need to set its "cancelTouchesInView" property to false. And that's all. You don't need to implement the IUGestureRecognizerDelegate functions to have it work (although that may be different if you have multiple gesture recognizer and not just one).

Answer 3

It's simple. Add tag to each cell of UITableView in "cellForRowAtIndexPath:" method i.e
cell.tag = indexPath.row
same goes for the CollectionViewCell inside the UICollectionView
Let say you have a tableView with 2 rows and which is having 2 collectionViews respectively.
row1 of UITableView will have tag 0 and other one will have tag 1.
Now when the user clicks on the collectionViewCell inside the collectionView which is inside a UITableViewCell
Now, if you click the first collectionViewCell of the collectionView inside the first UITableViewCell
You will get the cell tag as 0 and as you already know that self.tag i.e is the tableViewCell is 0
Now, if you click the first collectionViewCell of the collectionView inside the 2nd UITableViewCell
You will get the cell tag as 0 and as you already know that self.tag i.e is the tableViewCell is 1
I think this was what you needed.Do let me know if it's clear to you.. Thanks :)