A Tour of UICollectionView
A Tour of UICollectionView
WWDC 2018
Flow Layout
Customize the layout
We can make it better!
When To Go Custom?
It works!
But the scrolling performance is bad.
We can make it better
PerformBatchUpdate()
- Animate updates together
- Perform data source updates and collection view updates in updates closure
- Collection view updates ordering does not matter!!!
- Data Source updates ordering does matter!!!
DataSource Updates: Order Matters
Collection View Updates Coalescing
Update Combinations That Don’t Make Sense😡
- Move and Delete the same location 😡
- Move and Insert to the same location 😡
- Move more than 1 location to the same location 😡
- Referencing an invalid IndexPath 😡
We can fix it!
