The Point of Redacted SwiftUI: Part 1

Episode #117 • Sep 14, 2020 • Subscriber-Only

Not only can we easily redact the logic from a view using the Composable Architecture, but we can also insert new logic into our views without making any changes to the core logic of the view. To demonstrate this we will build an onboarding flow for a more complex application.

Part 1
Introduction
00:05
What’s the point?
00:37
Redacting a todo app
02:12
Todo onboarding
10:59
Next time: guided onboarding
28:57

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Introduction

This is so incredibly powerful, and this is what it means to take “separation of concerns” seriously. We have truly separated the logic from the view, so much so that we can wholesale replace the logic for a view with anything we want.

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Exercises

  1. The unredacted helper is super cool, but it might be nicer to define a more general view modifier that can transform the current view in a trailing closure. Define an applying helper that would allow us to replace our unredacted code above:

    //.unredacted(if: self.onboardingStep == .filters)
    .applying {
      if self.onboardingStep == .filters {
        $0.unredacted()
      } else {
        $0
      }
    }
    
    Solution
    extension View {
      func applying<V: View>(
        @ViewBuilder _ builder: @escaping (Self) -> V
      ) -> some View {
        builder(self)
      }
    }
    
  2. Update the onboarding flow to allow for interacting with navigation actions when on the actions step.

    Solution

    Watch next week’s episode 😁

  3. Update the onboarding flow to allow for filtering when on the filters step.

    Solution

    Watch next week’s episode 😁

  4. Update the onboarding flow to allow for interacting with todos when on the todos step. How might you maintain the live behavior where completed todos are sorted to the bottom of the todos list after a second?

    Solution

    Watch next week’s episode 😁

References

Separation of Concerns

“Separation of Concerns” is a design pattern that is expressed often but is a very broad guideline, and not something that can be rigorously applied.

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