Dallas Johnson questions

Dallas Johnson answers

• Collection View isn't being displayed, cellForItemAtIndexPath is never called
• UIView subclass in Swift: IBOutlet is found nil while unwrapping
• How to layout UICollectionView with tabbar on SupplementaryView, and switching different content?
• How to restore bindings in UICollectionViewCell after it is decoded
• NSFetchedResultsController complex fetch request and model
• Visible lag while scrolling two way scrolling UICollectionView with large number of cells (250,000 or more)