Single CollectionView for Multi Tab SegmentControl - ios

Question

I want to display two collection view using segment controller, on change of segment second collection view will display.
my code is :
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"morningcell" forIndexPath:indexPath];
UICollectionViewCell *cell1 = [collectionView dequeueReusableCellWithReuseIdentifier:#"eveningcell" forIndexPath:indexPath];
if (_segment.selectedSegmentIndex == 0) {
UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, cell.frame.size.height,cell.frame.size.width)];
lbl.text = [numbers objectAtIndex:indexPath.row];
[cell addSubview:lbl];
[lbl setTextAlignment:UITextAlignmentCenter];
return cell;
}
else{
UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, cell1.frame.size.height,cell1.frame.size.width)];
lbl.text = [numbers objectAtIndex:indexPath.row];
[cell1 addSubview:lbl];
[lbl setTextAlignment:UITextAlignmentCenter];
return cell1;
}}

Answer 1

Do not create two collectionView for the task that you want because you can achieve it using a single collectionView.
#interface YourVC(), UICollectionViewDelegate, UICollectionViewDataSource {
NSArray *arrayOfModelsForFirstCollectionView;
NSArray *arrayOfModelsForSecondCollectionView;
}
#end
#implementation YourVC
-(void)viewDidLoad{
[super viewDidLoad];
//Fetch Data For both Segments Using Your Web API Call or Local Database API Call
}
-(IBAction)didChangeSegmentIndex:(id)sender{
//When segment is changed you need to tell your collectionView to update the data.
[self.collectionView reloadData];
}
-(NSInteger) collectionView:(UICollectionView *)collectionView numberOfRowsInSection:(NSInteger)section{
//When reloadData is call this method will check that which index is selected.
//And according to selection it will create number of cells.
if (self.segmentControl.selectedIndex == 0){
return arrayOfModelsForFirstCollectionView.count;
}else{
return arrayOfModelsForSecondCollectionView.count;
}
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
//While creating a cell it will check which segment is selected so it will initialize and create the cell with respect to selection of segments.
//Hence you have created two different cells in a single collectionView toggling with a segmentControl.
if (_segment.selectedSegmentIndex == 0) {
return [self makeCellForFirstSegmentAtIndexPath: indexPath];
}
else{
return [self makeCellForSecondSegmentAtIndexPath: indexPath];
}
}
-(UITableViewCell *)makeCellForFirstSegmentAtIndexPath:(NSIndexPath *)indexPath{
//To show data from array you need to use arrayOfModelsForFirstCollectionView because this array is associated with First Segment Index
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"morningcell" forIndexPath:indexPath];
UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, cell.frame.size.height,cell.frame.size.width)];
lbl.text = [arrayOfModelsForFirstCollectionView objectAtIndex:indexPath.row];
[cell addSubview:lbl];
[lbl setTextAlignment:UITextAlignmentCenter];
return cell;
}
-(UITableViewCell *)makeCellForSecondSegmentAtIndexPath:(NSIndexPath *)indexPath{
//To show data from array you need to use arrayOfModelsForSecondCollectionView because this array is associated with Second Segment Index
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"eveningcell" forIndexPath:indexPath];
UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, cell.frame.size.height,cell.frame.size.width)];
lbl.text = [arrayOfModelsForSecondCollectionView objectAtIndex:indexPath.row];
[cell addSubview:lbl];
[lbl setTextAlignment:UITextAlignmentCenter];
return cell;
}
#end