Composable Navigation: Alerts & Dialogs

Episode #223 • Feb 20, 2023 • Subscriber-Only

Let’s dip our toes into the new composable navigation tools by improving how alerts and confirmation dialogs can used in the library. We will create a new reducer operator that more correctly handles the logic and hides unnecessary details.

Alerts & Dialogs
Alerts today
The problem
Confirmation dialogs
Next time: sheets

Unlock This Episode

Our Free plan includes 1 subscriber-only episode of your choice, plus weekly updates from our newsletter.


Brandon: So, we are seeing that if you want integrated features in vanilla SwiftUI in order to reap all the benefits that brings, you still have a number of steps to take to get it right, but in some sense there is even less help from the compiler and runtime to make sure you did everything correctly.

We think everything we have accomplished so far is pretty cool and even impressive, but its real purpose is to dip our toes into composing features together and communicating between features, because that concept is central to the Composable Architecture, and even more so with navigation.

By composing many features together, including all the destinations one can navigate to, we can have a very simple representation of something that is actually quite complex. No matter how many different places you can navigate to from a screen, and no matter how many layers deep you are in a navigation stack, you will have the ability to inspect what is happening in every layer and introduce new logic to integrate everything together. It’s honestly amazing to see.

Stephen: But building those tools takes time, and to get the first hint at what those tools will look like eventually we will turn to one of the simplest forms of navigation: alerts. Alerts have the notion of presenting and dismissing, but they don’t manage logic and behavior on the inside. They simply show some buttons, and the user taps one of them to dismiss and optionally kick off an action.

Let’s start by showing how we can add an alert to this application using the tools that the Composable Architecture already comes with, and in fact these tools have been in the library since basically the beginning. And then we will see how we can greatly improve the tools, and that will set the stage for more complicated forms of navigation, such as sheets, popovers ,and even drill-downs.

This episode is for subscribers only.

Subscribe to Point-Free

Access this episode, plus all past and future episodes when you become a subscriber.

See plans and pricing

Already a subscriber? Log in


Single entry point systems

Brandon Williams & Stephen Celis

Learn about “single entry point” systems, and why they are best suited for our dependencies library, although it is possible to use the library with non-single entry point systems.

Composable navigation beta GitHub discussion

Brandon Williams & Stephen Celis • Monday Feb 27, 2023

In conjunction with the release of episode #224 we also released a beta preview of the navigation tools coming to the Composable Architecture.