Developers must manage two aspects of any CollectionView: First, they define the layout and presentation of the CollectionView. Second, they must update the data received through the dataSource object. This data includes both the view itself (presentation) and what’s in it (content). Similar to other processes managing layout, Collection Views enforce strict rules, which, when broken, result in a crash.

To add a CollectionView, developers cannot simply add a UICollectionView to their application and expect the desired content to display.

Using the layout object of UICollectionViewLayout, developers add cells, which represent interactive data, and supplementary views, such as headers, footers, or decorations adorning cells. This layout object does not define each individual view though. That process is done by the CollectionView’s data source object.

The data source of a CollectionView defines the content and view of each cell. Upon first loading content, the CollectionView creates a queue of view objects, which the developer will dequeue as required. New views must be registered with a unique identifier.

Then, for the actual content of the view, developers can prefetch cells and/or data. The former is an opt-out method because it provides a seamless scrolling experience. The latter, dealing with data, depends more on each developer and is often used when fetching data requires a costly request.

Maintaining CollectionViews in a responsive way, especially when reordering elements based on user input or using delegates to manage specific items in a view, is a tough process and can cause any number of errors.

For example, if you forget to register a new view or mix up a custom view with a normal cell type, your application will likely crash.

The main rule with CollectionViews is that the interface presenting data must match the order of the items in the data source object. This is managed automatically by the UICollectionViewDiffableDataSource object, though you might need to use other methods when rearranging or changing data.

But, these types of crashes are easily identifiable and solvable with Embrace. We analyze console logs from NSLog to properly categorize these ambiguous crashes. Right now, we can alert you to Watchdog timeouts, Auto Layout exceptions, and CollectionView crashes when they happen. Not only will we be able to use these console logs to categorize many more of the undiagnosed crashes you struggle with, we’ll be able to automatically recategorize old reports that match this newly found crash.

That’s just one of the features that makes Embrace the best-in-class mobile platform.

Who We Are

Embrace is a mobile monitoring and developer analytics platform. We are a one-stop shop for your mobile app’s performance and error debugging needs. If you’d like to learn more about Embrace, you can check out our website or visit our docs! Feel free to ask us a question or get right down to it and see the product in action with a live demo.