Follow along at https://www.hackingwithswift.com/100/swiftui/39.
This day covers Part One of Project 8: Moonshot in the 100 Days of SwiftUI Challenge.
It focuses on several specific topics:
- Moonshot: Introduction
- Resizing images to fit the screen using GeometryReader
- How ScrollView lets us work with scrolling data
- Pushing new views onto the stack using NavigationLink
- Working with hierarchical Codable data
From the description:
In this project we’re going to build an app that lets users learn about the missions and astronauts that formed NASA’s Apollo space program. You’ll get more experience with Codable, but more importantly you’ll also work with scroll views, navigation, and much more interesting layouts.
GeomeryReader gives us a GeometryProxy that will contain data about the view's surrounding context after it's laid out.
This is everything 🙂. It means we can dynamically size a view with respect to how it's appearing in a container.
ScrollView is pretty straightforward, but there's one important caveat: It's views get created immediately. This means that for dynamic, lazy, performant, view-recycling layouts... List is often the best choice.
Again, SwiftUI makes this pretty straightforward. Now we just need more control over the entire navigation stack for pushing, popping, or hopping somewhere in between.
Codable is smart. If a Codable type contains a property that also conforms to Codable. A decoder or encoder will know to call that property's own decode or encode methods while performing them for the containing instance.