100 Days of SwiftUI

Day 73

2026-07-26

Project 14, part 6

Bucket List wrap up

Quiz: 11/12

Challenge

1. Allow the user to switch map modes, between the standard mode and hybrid.

This was a little more difficult than I expected, first because MapStyle isn’t Equatable so I couldn’t just use a ternary on currentStyle. I also had difficulties landing the button

@State private var isHybrid = false

***

.safeAreaInset(edge: .top, alignment: .trailing) {
    Button("", systemImage: "map") {
        isHybrid.toggle()
    }
    .accessibilityLabel(isHybrid ? "Show standard map" : "Show hybrid map")
    .padding()
    .buttonStyle(.borderedProminent)
}
.mapStyle(isHybrid ? .hybrid : .standard)

2. Our app silently fails when errors occur during biometric authentication, so add code to show those errors in an alert.

This was a bit more difficult because I wasn’t sure where the logic was supposed to go — it needs to be in the ViewModel class (to define variables) authentication() method (to set variables). Then the alert modifier goes on the Unlock button.

3. Create another view model, this time for EditView. What you put in the view model is down to you, but I would recommend leaving dismiss and onSave in the view itself — the former uses the environment, which can only be read by the view, and the latter doesn’t really add anything when moved into the model.

This is a matter of taking most everything out of the EditView and then remembering to add viewModel. as a prefix to items in the EditView