Views and modifiers: Wrap up

Paul Hudson    @twostraws    October 23rd 2021

These technique projects are designed to dive deep into specific SwiftUI topics, and I hope you’ve learned a lot about views and modifiers here – why SwiftUI uses structs for views, why some View is so useful, how modifier order matters, and much more.

Views and modifiers are the fundamental building blocks of any SwiftUI app, which is why I wanted to focus on them so early in this course. View composition is particularly key, as it allows to build small, reusable views that can be assembled like bricks into larger user interfaces.

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.

Challenge

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. Go back to project 1 and use a conditional modifier to change the total amount text view to red if the user selects a 0% tip.
2. Go back to project 2 and replace the Image view used for flags with a new FlagImage() view that renders one flag image using the specific set of modifiers we had.
3. Create a custom ViewModifier (and accompanying View extension) that makes a view have a large, blue font suitable for prominent titles in a view.

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