UITableView and UICollectionView interaction ios? - ios

Question

Please can anyone help me to achieve something like this-
(developing for iPad iOS7) In UIViewController i have UITableView & UICollectionView(like splitViewController).I just want to change image in UICollectionView when i tap on UITableViewCell.(I am using button over tableViewCell and collecting index in NSInteger).
Please help me to achieve this,I am trying from so many days,but can't achieve till now. :(
Here is the code what i have done till now.
In my viewDidLoad:
self.collectionViewImages=[[NSMutableArray alloc]initWithObjects:#"1.jpg",#"2.jpg",#"3.jpg",nil] ;
Then in CollectionViewMethods:
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section
{
return [_collectionViewImages count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:#"Cell"
forIndexPath:indexPath];
NSString *collectionViewImageName=[self.collectionViewImages objectAtIndex:indexPath.row];
UIImageView * collectionImage = (UIImageView*)[myCell viewWithTag:11];
collectionImage.image =[UIImage imageNamed:collectionViewImageName];
return myCell;
}
Then on ButtonClick(ofTableViewCell)--
(i am collecting tag of each button in NSInteger and using that property in numberOfItemsInSection like this,
-(void)btnTapped:(id)sender{
int tag= [(UIButton *)sender tag];
NSLog(#"Button Pressed%d",tag);
_buttonIndex=tag;
//_buttonIndex is NSInteger property
//If i add object in NSMutableArray and call reloadData my UI hangs here only.
//If I empty my NSMutableArray and add new objects in it and then call reloadData, I am getting NSRangeException.
}
And now i am using this property in numberOfItemsInSection as...
if (_buttonIndex==1){
[collectionImage setImage:[UIImage imageNamed:[_array1 objectAtIndex:indexPath.row]]];
//My _array1 has 4 objects and my collectionViewImages array has 7 objects.
}
i am getting error message as
*** Terminating app due to uncaught exception 'NSRangeException',
reason: '*** -[__NSArrayM objectAtIndex:]: index 4 beyond bounds [0 .. 3]'

Answer 1

Its crashing because you are trying to get an item from the array at index 4. But there are only indexes: 0,1,2,3.
Double check the contents of array1 on line (if it crashes here):
[collectionImage setImage:[UIImage imageNamed:[_array1 objectAtIndex:indexPath.row]]];
Otherwise find the other place where you call objectAtIndexand check if it crashes there.