CODEWITHSUNDEEP
scrolluicollectionviewperformance
Jirune
Jirune

Reputation: 2340

UICollectionView poor scrolling performance with simple UICollectionViewCell

I'm using UICollectionView to show grid based View in iPad. I have only 200 (20rows x 10 columns) cells at a time on screen, each cell contain one UILabel only. It starts to get slower on scrolling and not smooth like in TableView.

I don't know the reason for this slower scrolling performance. How do I improve?

Thanks in advance!

I have 3 collectionviews, but the main content uicollectionview is the one which has been tagged 2. Here is my code

if (collectionView.tag==0) { //This tagged collection view is for Left side selection box

    LeftSelectionBoxItem *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"SelectionCell" forIndexPath:indexPath];

    return cell;
}
else if (collectionView.tag==1){ //This tagged collection view is for to show column names

    TopColumnItem *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"ColumnCell" forIndexPath:indexPath];
    cell.columnName.text = [NSString stringWithFormat:@"%@",[self.columnNames objectAtIndex:indexPath.item]];

    return cell;
}
else if (collectionView.tag==2) { //This tagged collection view is for to show main content

    GridItem *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"GridCell" forIndexPath:indexPath];
    cell.dataLabel.text = [NSString stringWithFormat:@"%@",[[self.dataModel objectAtIndex:indexPath.section] objectForKey:[self.columnNames objectAtIndex:indexPath.item]]];

    return cell;
}
else {
    return nil;
}

Upvotes: 1

Views: 3525

Answers (1)

lehn0058
lehn0058

Reputation: 20257

Having a lot of UILabels is sometimes expensive. Try changing them to CATextLayers instead, as these have much less overhead. Note that if you do this and use rasterizing, you will need to tell the layer to rasterize for retina display devices too.

Upvotes: 3

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