CODEWITHSUNDEEP
iosexceptionuicollectionview
user2478518
user2478518

Reputation:

'NSInvalidArgumentException' : attempt to scroll to invalid index path

This is my code for animating the CollectionViewCustomCells.

-(void)viewDidAppear:(BOOL)animated{

    rowIndex = 0;

    [NSTimer scheduledTimerWithTimeInterval:1.0
                                     target:self
                                   selector:@selector(targetMethod)
                                   userInfo:nil
                                    repeats:YES];
}

-(void)targetMethod
{
    [self.offerCollectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:rowIndex inSection:1]
                      atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally
                              animated:YES];

    rowIndex=(rowIndex<parserDataContentArrayForExhibitor.count-1)?(rowIndex+1):0;

//    if (rowIndex == parserDataContentArrayForExhibitor.count) {
//        rowIndex = 0;
//    }


}


Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'attempt to scroll to invalid index path: <NSIndexPath 0xab55110> 2 indexes [1, 0]'

I am getting this exception each time i run my app. But sometimes the app is running good. I believe there is some leak or something kind of stuff. What I tried : When i googled I Found that this kind of error is because if i write a section which does not exist and the section's index is 0 for the first section.

so i changed my target method to : 

-(void)targetMethod
{
    [self.offerCollectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:rowIndex inSection:0]
                      atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally
                              animated:YES];

    rowIndex=(rowIndex<parserDataContentArrayForExhibitor.count-1)?(rowIndex+1):0;

//    if (rowIndex == parserDataContentArrayForExhibitor.count) {
//        rowIndex = 0;
//    }


}

But then the same thing happens with a slight change in the parameter of the exception.

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'attempt to scroll to invalid index path: <NSIndexPath 0xab22ea0> 2 indexes [0, 0]'

Section Code: 

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{

    return 1;
}

PLease help me as this is kind of new to me.

Thank You.

Best Regards.

Upvotes: 2

Views: 14980

Answers (1)

Prince Kumar Sharma
Prince Kumar Sharma

Reputation: 12641

Keep this line inside an if:

if (parserDataContentArrayForExhibitor.count > 0) {
 rowIndex = (rowIndex<parserDataContentArrayForExhibitor.count - 1) ? (rowIndex + 1) : 0;
}

Since you are passing a section count of 1, keep your section 0 and not 1 because the indexing is zero based. If you had numberOfSectionsInCollectionView = 2 then you could have two sections {0, 1}

[self.offerCollectionView scrollToItemAtIndexPath: [NSIndexPath indexPathForItem: rowIndex inSection: 0];
                  atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally
                          animated:YES];

Upvotes: 5

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