How to pass array data inside ViewController to UICollectionView Custom Cell? - ios

Question

I am making a tableView inside custom 'UICollectionViewCell' and inside my ViewController I have an array containing data to be displayed in TableView at each row.
Therefore, I want to pass the data of this array to custom cell (containing tableview delegates methods).
I am doing like this but its not helping.
Inside "GroupCollectionViewCell.m"
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *groupTableIdentifier = #"DeptGroupTable";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:groupTableIdentifier];
if (cell == nil) {
}
RoadmapViewController *vc = [[RoadmapViewController alloc] init];
cell.textLabel.text =[vc.grouplist objectAtIndex:indexPath.row];
return cell;
}
And inside "RoadViewController.m"
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
GroupCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[GroupCollectionViewCell alloc] init];
// [cell.groupData addObjectsFromArray:_grouplist];
//:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
return cell;
}
Note - groupList if the array which I want to pass and groupData is a blank array inside custom cell.

Answer 1

Create one MutableArray object inside your CollectionViewCell and one method like this
#property (strong, nonatomic) NSMutableArray *arrObj;
-(void)loadTableData(NSMutableArray*)arr {
self.arrObj = arr;
[self.tableView reloadData];
//Now used this arrObj in your delegate and datasource method
}
After that call this function from cellForItemAtIndexPath like this way
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
GroupCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[GroupCollectionViewCell alloc] init];
// [cell.groupData addObjectsFromArray:_grouplist];
//:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
[cell loadTableData:arr];
return cell;
}
Hope this will help you.

Answer 2

If you use alloc init to create RoadmapViewController and get grouplist from that, it is obviously that your vc.grouplist will return nil.
Remove these two lines:
RoadmapViewController *vc = [[RoadmapViewController alloc] init];
cell.textLabel.text =[vc.grouplist objectAtIndex:indexPath.row];
And do this:
cell.textLabel.text =[_groupData objectAtIndex:indexPath.row];
And in "RoadViewController.m" add this method:
- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(GroupCollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath{
cell.groupData = _groupList;
[collectionView reloadData];
}