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SwiftUI Issue: App Freezes with @Environment(.dismiss) and Callback

Description

I've encountered an interesting issue while working on a SwiftUI project, specifically when using @Environment(\.dismiss) along with a callback function like onSuccess: (Bool) -> Void in a ListDetail view. The app starts freezing, and CPU utilization spikes to 99%.

The repository now contains two branches:

  • issue/swiftui-freezing: This branch keeps the original code that reproduces the issue as encountered.
  • main: This branch contains the fixed code, which resolves the freezing problem.

Problem:

  • Scenario:

    • Using @Environment(\.dismiss) in the ListDetail view.
    • Including a callback function, onSuccess: (Bool) -> Void, to handle success scenarios for ListDetail.

  • Symptoms:

    • The app freezes when these two components are used together.
    • CPU utilization spikes to 99%, causing performance degradation.

  • Workaround:

    • If I comment out @Environment(\.dismiss), in the ListDetail view. or
    • Remove the onSuccess callback from ListDetail View, the app works perfectly fine without freezing.

Steps to Reproduce:

  1. Open the project.

  2. Check these two files that are causing the issue:

    • ListDetail.swift
    • ListView.swift

    In both files, the combination of @Environment(\.dismiss) and the onSuccess callback is causing the freeze.

This issue raises the question of whether there is a potential conflict when using @Environment(\.dismiss) alongside a callback in SwiftUI.

App Freeze Issue

Versions:

  • Xcode: 15.2
  • iOS: 17.2
  • macOS: 14.6.1