Automating Screenshots for the Mac App Store
Meeting the requirements for screenshots is a frustrating experience. On iOS, tooling like SimulatorStatusMagic, Nine41, and fastlane snapshot help make the process easier. However, on macOS there is much less support (and, sadly, demand) for automated tooling — so you are kind of on your own to figure it out. I spent some time recently solving this process for myself. I want to share how I have managed to automate perfect screenshots for the Mac App Store.
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As of Xcode 9, Xcode UITest allows you to capture screenshots during tests. This is the API that fastlane uses under-the-hood for iOS. Again, because fastlane is not an option for macOS, you can implement this yourself. Xcode makes this process rather simple and easy. Here’s a helper method that saves a screenshot.
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The screenshots from XCUITest have ugly artifacts in the window corners. They are not correctly cropped and clipped with a transparent background, like when you take a screenshot via the built-in functionality in macOS.
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Using Retrobatch, I created a workflow to round the corners. Through trial and error, I arrived at a corner radius of 24 points.
