Refactor the UI layout of ImagenScreen to solve the navigation flicker #1719
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Summary of Changes
Hello @YoungHypo, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request focuses on refactoring the UI layout of the ImagenScreen to resolve a navigation flicker issue and ensure the navigation title correctly renders in its large display mode. The core change involves adjusting the view hierarchy by making the entire screen content scrollable from the outset, which helps SwiftUI manage the navigation bar's appearance more effectively.
Highlights
- UI Layout Refactoring: The root container of the
ImagenScreen'sbodyhas been changed from aZStackto aScrollView(line 36). This modification ensures that the entire screen content, including theInputFieldandLazyVGrid, is scrollable from the initial load. - Nested ScrollView Removal: The
ScrollViewthat previously wrapped only theLazyVGrid(lines 47-64) has been removed. Its functionality is now superseded by the new top-levelScrollView, simplifying the view hierarchy. - Progress Overlay Refinement: The conditional rendering of the
ProgressOverlay(previously lines 66-68) has been refactored to use an.overlaymodifier on the mainVStack(line 64), providing a more idiomatic SwiftUI approach for displaying overlays.
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Code Review
The pull request refactors the ImagenScreen layout to resolve a navigation title flicker by wrapping the view's content in a ScrollView. The review focuses on improving the LazyVGrid implementation to be more adaptive and robust by avoiding hardcoded screen dimensions and using stable identifiers for the list items.
| GridItem(.fixed(UIScreen.main.bounds.width / 2 - spacing), spacing: spacing), | ||
| GridItem(.fixed(UIScreen.main.bounds.width / 2 - spacing), spacing: spacing), | ||
| ], spacing: spacing) { | ||
| ForEach(viewModel.images, id: \.self) { image in |
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Using id: \.self with UIImage can cause performance issues because UIImage is a class. When images are regenerated, new UIImage instances cause SwiftUI to re-render the entire grid. Consider wrapping UIImage in a custom struct that conforms to Identifiable (e.g., using a UUID for the id) to improve UI performance.
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I’ve tried to generate images multiple times in imagenscreen. The UI remained smooth without noticeable lag when re-rendering the image grid. If you think adjustments are necessary, I'll do that. @paulb777
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@YoungHypo Thanks for the PR. Please respond to gemini's review comments. |
Fix #1718
Wrap the InputField and LazyVGrid in a ScrollView to make swiftUI render the titile in
.largemode by default at first.