Before we move on to our next batch of projects, you have a fresh challenge to complete. This means building a complete app from scratch by yourself, using the skills you’ve acquired over the previous three projects.
This time your goal is to build a habit-tracking app, for folks who want to keep track of how much they do certain things. That might be learning a language, practicing an instrument, exercising, or whatever – they get to decide which activities they add, and track it however they want.
At the very least, this means there should be a list of all activities they want to track, plus a form to add new activities – a title and description should be enough.
For a bigger challenge, tapping one of the activities should show a detail screen with the description. For a tough challenge – see the hints below! – make that detail screen contain how many times they have completed it, plus a button incrementing their completion count.
And if you want to make the app really useful, use
UserDefaults to load and save all your data.
So, there are three levels to this app, and you can choose how far you want to go depending on how much time you have and how far you want to push yourself. I do recommend you at least give each level a try, though – every little bit of practice you get helps solidify your learning!
Hacking with Swift+ subscribers can get a complete video solution for this checkpoint here: Solution to Habit Tracking. If you don’t already subscribe, you can start a free trial today.
@Publishedfor its property.
Identifiableto avoid problems.
sheet(), and your activity detail view (if you add one) using
Making the button to increment completion count will challenge you, because you need to modify the activity that was passed in. If you’re stuck, the easiest approach is this:
Equatable. You don’t need anything special here – just add
ObservableObjectclass into your detail view.
firstIndex(of:)to find where the previous activity was in the class’s array, then change it to be your new activity – something like
data.activities[index] = newActivitywill work. (This requires the
Equatableconformance from step 1!)
This is genuinely a useful app to build, particularly if it were specialized towards a particular interest – if the goal were practicing an instrument then you could imagine a more advanced app suggesting different things to practice, or if the goal were exercise then it might suggest new exercises to keep things mixed up.
As it is, this challenge is only a small app, but I hope it at least makes you think. Good luck!
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