Using NSArray to populate collectionView - ios

Question

I am new to Objective-C, I have a function which accepts NSArray as a parameter now I want to store that array in a local var in my function and then populate collection view through that array, ps I'll also have to update cellForItemAtIndexPath delegate method in the same class.
This is the method in the tableView's Cell class. Here I've embedded a collectionView in the cell.
-(void)initCellWithSetsArray:(NSArray *)setsArray{
NSMutableArray *setArray = [NSMutableArray array];
}
This is where i am calling this method which accept the array in cellForRowAt tableView's delegate method.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
[cell initCellWithSetsArray :self.setsHistoryArray];
}
So i need to update the collectionView based on the array parsed in the func when called in cellForRowAtIndexPath. I hope you guys get the picture now.

Answer 1

You need to add a property to your cell class to hold the array:
#property (strong, nonatomic) NSArray *setsArray;
-(void) setSetsArray(NSArray *)sets {
_setsArray = sets;
[self.collectionView reloadData];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section {
return [self.setsArray count];
}
You can use this array in your cellForItemAt method in your cell class.
Also, in your cell classes prepareForReuse you should clear the existing array and reload the collection view:
-(void)prepareForReuse {
self.setsArray = nil;
[self.collectionView reloadData];
}
Then you can simply assign the property in your cellForRowAt::
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
MyCellClass *cell = (MyCellClass *)[tableView dequeueReusableCellWithIdentifier:"MyCellIdentifier" forIndexPath:indexPath];
cell.setsArray = self.setsHistoryArray; // Note: This looks wrong; - you should normally use indexPath.row to get the right data for this row
return cell;
}

Answer 2

Try this ;
pragma mark CollectionView
-(NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return arrNames.count;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"areacell" forIndexPath:indexPath];
UILabel *lblName = (UILabel *)[cell viewWithTag:101]; // set tag in storyboard for this label
lblName.text = arrNames[indexPath.item];
return cell;
}