CODEWITHSUNDEEP
iphoneobjective-ccocoa-touch
Muhammad Umar
Muhammad Umar

Reputation: 11782

Using UICollectionView In iphone

I have an array with 10 entries. I want to display them on UICollectionView as 3 in each row so they will be like

A B C
D E F
G H I
J

Now I am using following code

#pragma mark - UICollectionView Datasource

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{

}

- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section
{
    return 3;
}

- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView
{
    return [self.btnArray count];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
     UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

    Buttons *btn = [self.btnArray objectAtIndex:(indexPath.section * indexPath.row)];
    NSURL* aURL = [NSURL URLWithString:btn.imagePath];
    NSData* data = [[NSData alloc] initWithContentsOfURL:aURL];

    cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithData:data]];
    return cell;
}

#pragma mark – UICollectionViewDelegateFlowLayout

// 1
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    CGSize retval =  CGSizeMake(75, 75);
    return retval;
}

// 3
- (UIEdgeInsets)collectionView:
(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdgeInsetsMake(50, 20, 50, 20);
}

However When I hit 

 UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

It gives me error 

NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier Cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

what is wrong?

Upvotes: 1

Views: 1152

Answers (1)

Dancreek
Dancreek

Reputation: 9544

As the error says, you need to register a nib or class for cells with that identifier. You do this once when you setup your view.

See the UICollectionView Documentation for these two methods:

– registerClass:forCellWithReuseIdentifier:
– registerNib:forCellWithReuseIdentifier:

Upvotes: 3

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