100-days-of-swiftui-and-combine/day-086

Day 86: Project 17: Flashzilla (Part One)

Follow along at https://www.hackingwithswift.com/100/swiftui/86.

📒 Field Notes

This day covers Part One of Project 17 in the 100 Days of SwiftUI Challenge.

It focuses on several specific topics:

• Flashzilla: Introduction
• How to use gestures in SwiftUI
• Making vibrations with UINotificationFeedbackGenerator and Core Haptics
• Disabling user interactivity with allowsHitTesting()

Flashzilla: Introduction

From the project description:

In this project we’re going to build an app that helps users learn things using flashcards – cards with one thing written on the front, such as “to buy”, and another thing written on the other side, such as “comprar”.

How to use gestures in SwiftUI

My intuition for when to use @GestureState vs @State when updating the UI via gestures remains a bit tenuous -- but I'm definitely seeing how the former can be useful: @GestureState is way of telling SwiftUI that this value can only be mutated during a gesture's updating callback. @State is much more liberal.

Code

The concepts project to go along with this day can be found here.