UICollectionView recieved layout attributes for a cell with an index path that does not exist

ios, objective-c, uicollectionview, uicollectionviewcell

Solution

The MultipleLineLayout was originally written for infinite scrolling, so there was a problem with that implementation for your use. It should look like this,

-(NSArray*)layoutAttributesForElementsInRect:(CGRect)rect {

    NSMutableArray* attributes = [NSMutableArray array];
    for(NSInteger i=0 ; i < self.collectionView.numberOfSections; i++) {
        for (NSInteger j=0 ; j < [self.collectionView numberOfItemsInSection:i]; j++) {
            NSIndexPath* indexPath = [NSIndexPath indexPathForItem:j inSection:i];
            [attributes addObject:[self layoutAttributesForItemAtIndexPath:indexPath]];
        }
    }
    return attributes;
}

Problem

I have used UICollection view to show items in grid layout. For data source I have use 5*5 dimensional array. And also I am returning 5 for numberOfItems in section and 5 for numberOfSections. Then also my app is getting crashed with following error: 'UICollectionView recieved layout attributes for a cell with an index path that does not exist: {length = 2, path = 0 - 5}' ``` //////===viewcontroller.m==/////// - (void)viewDidLoad { self.theData = @[@[@"1",@"2",@"3",@"4",@"5"], @[@"6",@"7",@"8",@"9",@"10"],@[@"11",@"12",@"13",@"14",@"15"],@[@"16",@"17",@"18",@"19",@"20"],@[@"21",@"22",@"23",@"24",@"25"]]; MultpleLineLayout *layout = [[MultpleLineLayout alloc] init]; self.collectionView.collectionViewLayout = layout; self.collectionView.showsHorizontalScrollIndicator = NO; self.collectionView.showsVerticalScrollIndicator = NO; layout.scrollDirection = UICollectionViewScrollDirectionHorizontal; self.view.backgroundColor = [UIColor blackColor]; [self.collectionView registerClass:[DataCell class] forCellWithReuseIdentifier:@"DataCell"]; [self.collectionView reloadData]; } - (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section { return 5; } - (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView { return 5; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { DataCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"DataCell" forIndexPath:indexPath]; cell.label.text = self.theData[indexPath.section ][indexPath.row]; return cell; } - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { // UICollectionViewCell *item = [collectionView cellForItemAtIndexPath:indexPath]; NSLog(@"%@",indexPath); } /////////////////////// ``` Can anyone solve this problem? Thanks in advance.

Original source