Summary

In this chapter, you learned how to build a Mac app from an existing iOS app.

You started by refining your app's user interface when running on the iPhone. Next, you added some code to make your app detect the device that it's running on, and modified your app's screens to work on all iOS devices. Finally, you used Mac Catalyst to build a Mac app from your iPad app. Your app now works great on iPhone, iPad, and Mac.

You're now able to make your existing iPhone apps run well on iPad, and also to make Mac apps from your iPad apps. As you have seen, once you have an iPhone app, you can make it work on iPad and Mac with relatively little effort.

In the next chapter, you'll learn a completely new way to build apps using SwiftUI, a modern way to write apps for any Apple platform.