I recently implemented UI Tests in our application and added code coverage to our existing unit tests. There were a few issues we ran into while setting these features up. Many projects may just be able to check the “Gather Code Coverage Data” checkbox, but others may need special setup.

iOS 8 provides support for resizable table view and collection view cells using AutoLayout but what if you want to autosize an arbitrary view? For instance, let’s say I have a view with a label inside that I want to resize based on content with a maximum width of the size of the screen. In iOS 7 you might have used a combination of preferredMaxLayoutWidth, a width constraint, and systemLayoutSizeFittingSize to set a maximum width on the label and find the fitted size. There is now an easier way to do this with systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:.