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BetterRest: Wrap up

Paul Hudson    @twostraws   

This project gave you the chance to get some practice with forms and bindings, while also introducing you to DatePicker, Stepper, navigationBarItems(), Date, DateComponents, and DateFormatter – these are things you’ll be using time and time again, so I wanted to get them in nice and early.

Of course, I also took the chance to give you a glimpse of some of the incredible things we can build using Apple’s frameworks, all thanks to Create ML and Core ML. As you saw, these frameworks allow us to take advantage of decades of research and development in machine learning, all using a drag and drop user interface and a couple of lines of code – it really couldn’t be any easier.

The truly fascinating thing about machine learning is that it doesn’t need big or clever scenarios to be used. You could use machine learning to predict used car prices, to figure out user handwriting, or even detect faces in images. And most importantly of all, the entire process happens on the user’s device, in complete privacy.

Review what you learned

Anyone can sit through a tutorial, but it takes actual work to remember what was taught. It’s my job to make sure you take as much from these tutorials as possible, so I’ve prepared a short review to help you check your learning.

Click here to review what you learned in this project.


One of the best ways to learn is to write your own code as often as possible, so here are three ways you should try extending this app to make sure you fully understand what’s going on:

  1. Replace each VStack in our form with a Section, where the text view is the title of the section. Do you prefer this layout or the VStack layout? It’s your app – you choose!
  2. Replace the “Number of cups” stepper with a Picker showing the same range of values.
  3. Change the user interface so that it always shows their recommended bedtime using a nice and large font. You should be able to remove the “Calculate” button entirely.

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