When using TDD you can work more quickly by running a subset of tests – press
⌃⌥⌘G to re-run only your last test, or
⌘-click several tests to run only them.
If you’re in a folder that has both a workspace and a project, use
xed . to open the workspace in Xcode. If there were only a project, that would have been opened instead.
If you're looking at a Swift data type and just want a summary of what it does, press
⌃⌘↑ to have Xcode generate an interface showing only its external properties and methods.
Filtering the jump bar
If you find Xcode's jump bar a little long, try filtering it. After pressing ⌃6 to bring up the jump bar, you can start typing a few letters to filter all your properties and methods using a fuzzy search.
Clearing up space
If you’ve been using Xcode for a few years, you should run
xcrun simctl delete unavailable to remove any old simulators that are no longer supported. It's common to save 20-60GB with that one command!
When your program is paused, right-click on a variable and choose Watch. The next time that variable changes, you can step back one frame to see where it happened.
It’s common to see lots of output in Xcode’s log when you have an Auto Layout problem, but if you add identifiers to your constraint you’ll get more helpful messages – easy to do in both Interface Builder and code!
Measuring build time
If you've ever wondered how long it takes for Xcode to build your project, you can find out with one Terminal command.
defaults write com.apple.dt.Xcode ShowBuildOperationDuration -bool YES