Repository: OpenSwiftUIProject/OpenSwiftUI
Pull request #243: Add zIndex API
Author: login: Kyle-Ye
Created: 2025-04-05T07:58:17Z | Merged: 2025-04-05T08:39:43Z



<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
  - Introduced new functionality allowing developers to control the layering order of overlapping views using a customizable display order.

- **Tests**
  - Added automated tests to validate that the view layering control works as intended.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->


Diff:
diff --git a/Sources/OpenSwiftUICore/Layout/ZIndex.swift b/Sources/OpenSwiftUICore/Layout/ZIndex.swift
new file mode 100644
index 000000000..a099646b9
--- /dev/null
+++ b/Sources/OpenSwiftUICore/Layout/ZIndex.swift
@@ -0,0 +1,56 @@
+//
+//  ZIndex.swift
+//  OpenSwiftUICore
+//
+//  Audited for iOS 18.0
+//  Status: Complete
+
+extension View {
+    /// Controls the display order of overlapping views.
+    ///
+    /// Use `zIndex(_:)` when you want to control the front-to-back ordering of
+    /// views.
+    ///
+    /// In this example there are two overlapping rotated rectangles. The
+    /// frontmost is represented by the larger index value.
+    ///
+    ///     VStack {
+    ///         Rectangle()
+    ///             .fill(Color.yellow)
+    ///             .frame(width: 100, height: 100, alignment: .center)
+    ///             .zIndex(1) // Top layer.
+    ///
+    ///         Rectangle()
+    ///             .fill(Color.red)
+    ///             .frame(width: 100, height: 100, alignment: .center)
+    ///             .rotationEffect(.degrees(45))
+    ///             // Here a zIndex of 0 is the default making
+    ///             // this the bottom layer.
+    ///     }
+    ///
+    /// ![A screenshot showing two overlapping rectangles. The frontmost view is
+    /// represented by the larger zIndex value.](OpenSwiftUI-View-zIndex.png)
+    ///
+    /// - Parameter value: A relative front-to-back ordering for this view; the
+    ///   default is `0`.
+    @inlinable
+    nonisolated public func zIndex(_ value: Double) -> some View {
+        return _trait(ZIndexTraitKey.self, value)
+    }
+
+}
+@usableFromInline
+package struct ZIndexTraitKey: _ViewTraitKey {
+    @inlinable
+    package static var defaultValue: Double { 0.0 }
+}
+
+@available(*, unavailable)
+extension ZIndexTraitKey: Sendable {}
+
+extension ViewTraitCollection {
+    package var zIndex: Double {
+        get { self[ZIndexTraitKey.self] }
+        set { self[ZIndexTraitKey.self] = newValue }
+    }
+}
diff --git a/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift b/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
new file mode 100644
index 000000000..a779105bd
--- /dev/null
+++ b/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
@@ -0,0 +1,21 @@
+//
+//  ZIndexTests.swift
+//  OpenSwiftUICoreTests
+
+import OpenSwiftUICore
+import Testing
+import OpenGraphShims
+
+@MainActor
+struct ZIndexTests {
+    @Test
+    func indexOrder() {
+        struct ContentView: View {
+            var body: some View {
+                Color.red
+                    .zIndex(0.5)
+            }
+        }
+        // TODO: Add a test helper to hook into makeViewList and retrieve the zIndex value to verify it
+    }
+}


Reviews:
user: login: coderabbitai[bot]
body: **Actionable comments posted: 2**

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between bfea6f1716ecae02c2700859976366e213dbdde7 and 1f9f8d670489724d16150c778041b9eb4327d2dd.

</details>

<details>
<summary>📒 Files selected for processing (2)</summary>

* `Sources/OpenSwiftUICore/Layout/ZIndex.swift` (1 hunks)
* `Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift` (1 hunks)

</details>

<details>
<summary>🧰 Additional context used</summary>

<details>
<summary>🧬 Code Definitions (1)</summary>

<details>
<summary>Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift (1)</summary><blockquote>

<details>
<summary>Sources/OpenSwiftUICore/Layout/ZIndex.swift (1)</summary>

* `zIndex` (36-39)

</details>

</blockquote></details>

</details><details>
<summary>🪛 SwiftLint (0.57.0)</summary>

<details>
<summary>Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift</summary>

[Warning] 19-19: TODOs should be resolved (Add a test helper to hook into...)

(todo)

</details>

</details>

</details>

<details>
<summary>⏰ Context from checks skipped due to timeout of 90000ms (6)</summary>

* GitHub Check: Execute tests on Ubuntu (6.0.1)
* GitHub Check: Execute tests on iOS (macos-15, 16.0, 2021, 18.0)
* GitHub Check: Execute tests on iOS (macos-15, 16.0, 2024, 18.0)
* GitHub Check: Execute compatibility tests for iOS (macos-15, 16.0, 2024, 18.0)
* GitHub Check: Execute tests on macOS (macos-15, 16.0, 2021)
* GitHub Check: Execute compatibility tests for macOS (macos-15, 16.0, 2024)

</details>

<details>
<summary>🔇 Additional comments (6)</summary><blockquote>

<details>
<summary>Sources/OpenSwiftUICore/Layout/ZIndex.swift (6)</summary>

`8-41`: **Clean, well-documented implementation of zIndex API.**

The View extension and its documentation are excellent. The documentation clearly explains the purpose, provides a practical example with visual reference, and specifies the default value. The implementation follows the trait pattern used elsewhere in the framework.

---

`36-39`: **Implementation uses trait system correctly.**

The zIndex implementation properly uses the trait system to store the value, with appropriate annotations for inlining and actor isolation.

---

`42-46`: **Trait key implementation is appropriate.**

The ZIndexTraitKey implementation provides the correct default value (0.0) matching the documented behavior.

---

`48-49`: **Correctly marked as unavailable for Sendable.**

This prevents potential concurrent access issues with the trait key.

---

`51-56`: **ViewTraitCollection extension provides clean accessor.**

The computed property offers a convenient way to access the zIndex value in the trait collection.

---

`36-39`: **Consider validating the zIndex implementation with comprehensive tests.**

While the implementation looks solid, the associated test file (ZIndexTests.swift) doesn't yet verify the behavior of this API. Consider implementing the test helper mentioned in the TODO to ensure the functionality works as expected.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-04-05T08:01:14Z

Review comments:
diff_hunk: @@ -0,0 +1,21 @@
+//
+//  ZIndexTests.swift
+//  OpenSwiftUICoreTests
+
+import OpenSwiftUICore
+import Testing
+import OpenGraphShims
+
+@MainActor
+struct ZIndexTests {
+    @Test
+    func indexOrder() {
+        struct ContentView: View {
+            var body: some View {
+                Color.red
+                    .zIndex(0.5)
+            }
+        }
+        // TODO: Add a test helper to hook into makeViewList and retrieve the zIndex value to verify it
+    }
path: Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Incomplete test implementation.**

The test defines a view with a zIndex modifier but doesn't include any assertions to verify the functionality. This means the test isn't actually testing anything yet.

Consider implementing the test helper mentioned in the TODO comment or using a different approach to verify that the zIndex value is correctly applied to the view. Without assertions, this test doesn't provide any validation of the functionality.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 SwiftLint (0.57.0)</summary>

[Warning] 19-19: TODOs should be resolved (Add a test helper to hook into...)

(todo)

</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-04-05T08:01:13Z
author_association: NONE
diff_hunk: @@ -0,0 +1,21 @@
+//
+//  ZIndexTests.swift
+//  OpenSwiftUICoreTests
+
+import OpenSwiftUICore
+import Testing
+import OpenGraphShims
+
+@MainActor
+struct ZIndexTests {
+    @Test
+    func indexOrder() {
+        struct ContentView: View {
+            var body: some View {
+                Color.red
+                    .zIndex(0.5)
+            }
+        }
+        // TODO: Add a test helper to hook into makeViewList and retrieve the zIndex value to verify it
path: Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
user: login: coderabbitai[bot]
body: _💡 Verification agent_

<details>
<summary>🧩 Analysis chain</summary>

**Address TODO comment before merging.**

TODOs in committed code can lead to forgotten tasks and technical debt.

Either implement the test helper mentioned in the TODO, create a tracked issue to address it later, or add more context about why it can't be implemented yet.

---

🌐 Web query:

```web
What are best practices for testing SwiftUI view modifiers?
```

💡 Result:

To ensure SwiftUI view modifiers are thoroughly tested and maintainable, follow these best practices:

## Leverage ViewInspector for Hierarchy Inspection
Use **ViewInspector** to verify modifiers are applied correctly by inspecting the view hierarchy:
```swift
func testButtonStyle() throws {
    let view = Button("Test", action: {})
        .buttonStyle(PrimaryButtonStyle())
    
    let button = try view.inspect().button()
    XCTAssertEqual(try button.label().text().string(), "Test")
    XCTAssertTrue(try button.actualButtonStyle() is PrimaryButtonStyle) [1][5]
}
```
This validates both the presence of the modifier and its concrete type.

## Test Modifier Side Effects
Verify visual and behavioral impacts through:
1. **State changes**: Check if modifiers alter @State/@Binding
   ```swift
   XCTAssertTrue(viewModel.items.first!.isCompleted) [1]
   ```
2. **View updates**: Confirm layout changes after modifiers
   ```swift
   XCTAssertEqual(try list.count, 1) [1]
   ```

## Structure Modifiers for Testability
1. **Isolate pure modifiers** without external dependencies
2. **Create test targets** specifically for modifier validation [5]
3. **Use @testable imports** to access internal components
   ```swift
   @testable import YourAppModule [5]
   ```

## Validate Custom ViewModifier Conformance
Test custom modifiers by:
1. Checking protocol conformance
2. Verifying modifier composition
```swift
struct TitleModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .font(.largeTitle)
            .foregroundColor(.blue)
}
```

## Performance and Safety
1. **Profile with Instruments** to detect rendering bottlenecks from complex modifiers [8]
2. **Prevent recursion** using safety attributes:
   ```swift
   @warn_unqualified_access
   func customModifier() -> some View [10]
   ```

## Test Modifier Combinations
Validate interactions between multiple modifiers:
```swift
Text("Hello")
    .titleStyle()
    .watermarked("TEST")
// Verify both modifiers apply correctly [4][7]
```

## Asynchronous Testing
Handle modifiers with async operations using XCTest expectations:
```swift
let expectation = self.expectation(description: "Async modifier")
// Test async code
waitForExpectations(timeout: 1) [5]
```

By combining these strategies, you can create a robust testing suite that ensures view modifiers behave as expected across different states and configurations.

Citations:

- 1: https://www.kodeco.com/books/swiftui-cookbook/v1.0/chapters/9-testing-swiftui-views-with-viewinspector
- 2: https://www.kodeco.com/books/swiftui-cookbook/v1.0/chapters/8-unit-testing-strategies-in-swiftui
- 3: https://forums.swift.org/t/whats-the-best-way-to-conditionally-include-exclude-some-lines-of-code-for-performance-profiling/36532
- 4: https://www.hackingwithswift.com/books/ios-swiftui/custom-modifiers
- 5: https://www.kodeco.com/30227776-swiftui-testing-with-viewinspector-for-ios
- 6: https://developer.apple.com/documentation/swiftui/reducing-view-modifier-maintenance
- 7: https://www.avanderlee.com/swiftui/view-composition-viewmodifiers/
- 8: https://www.youtube.com/watch?v=aH15GUzk85Y
- 9: https://www.hackingwithswift.com/forums/100-days-of-swiftui/help-with-views-and-modifiers-day-24-challenge-2/4046
- 10: https://www.hackingwithswift.com/quick-start/swiftui/how-to-make-swiftui-modifiers-safer-to-use-with-warn-unqualified-access

---



</details>

**Action Required: Implement or Track the Z‑Index Test Helper**

Before merging, please address the pending TODO in `Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift` at line 19. The file currently contains this placeholder:

```swift
        // TODO: Add a test helper to hook into makeViewList and retrieve the zIndex value to verify it
```

To align with SwiftUI testing best practices, consider the following options:
- **Implement the Test Helper:** Use a solution such as [ViewInspector](https://www.kodeco.com/30227776-swiftui-testing-with-viewinspector-for-ios) to inspect the view hierarchy and verify that the expected zIndex is applied.
- **Document and Track:** If implementing this helper immediately isn’t feasible, add more context in the code explaining the limitation and create a tracked issue to ensure this task is addressed later.

Taking one of these actions will help prevent technical debt by ensuring that all view modifiers are properly tested.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 SwiftLint (0.57.0)</summary>

[Warning] 19-19: TODOs should be resolved (Add a test helper to hook into...)

(todo)

</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-04-05T08:01:13Z
author_association: NONE

PR comments:
user: login: coderabbitai[bot]
created_at: 2025-04-05T07:58:24Z
body: <!-- This is an auto-generated comment: summarize by coderabbit.ai -->
<!-- walkthrough_start -->

## Walkthrough
This pull request introduces a new view layer ordering feature into the OpenSwiftUICore framework. A new file extends the `View` protocol with a `zIndex(_:)` method to control the display order of overlapping views. The implementation uses a package-level trait key (`ZIndexTraitKey`) to manage a default z-index value and integrates this property into the view’s trait collection. Additionally, tests are added to validate the new API, ensuring that the z-index functionality works as expected by simulating view rendering behavior.

## Changes

| File                                | Change Summary |
|-------------------------------------|----------------|
| `Sources/…/ZIndex.swift`            | Introduces a new file that extends `View` with a `nonisolated public func zIndex(_:) -> some View` method. Adds a package-level `ZIndexTraitKey` with a default value of `0.0` and extends `ViewTraitCollection` with a z-index property. Marks the trait key as unavailable for `Sendable`. |
| `Tests/…/ZIndexTests.swift`          | Adds a new test file with a `ZIndexTests` structure annotated with `@MainActor`, including the test method `indexOrder()` that verifies the z-index functionality in a sample view. |

## Sequence Diagram(s)
```mermaid
sequenceDiagram
    participant Dev as Developer
    participant V as View Extension
    participant TC as ViewTraitCollection
    participant TK as ZIndexTraitKey

    Dev->>V: call zIndex(value)
    V->>TC: update trait (using TK)
    TC-->>V: trait updated
    V-->>Dev: return modified view with new z-index
```

## Poem
> Hop along, dear coder friend,  
> With z-index layers now on trend,  
> Views stack up with a graceful twist,  
> A trait key dance you can’t resist,  
> Carrots and code in one blissful blend!

<!-- walkthrough_end -->
<!-- internal state start -->


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created_at: 2025-04-05T08:03:46Z
body: ## [Codecov](https://app.codecov.io/gh/OpenSwiftUIProject/OpenSwiftUI/pull/243?dropdown=coverage&src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenSwiftUIProject) Report
Attention: Patch coverage is `0%` with `5 lines` in your changes missing coverage. Please review.
> Project coverage is 20.03%. Comparing base [(`bfea6f1`)](https://app.codecov.io/gh/OpenSwiftUIProject/OpenSwiftUI/commit/bfea6f1716ecae02c2700859976366e213dbdde7?dropdown=coverage&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenSwiftUIProject) to head [(`1f9f8d6`)](https://app.codecov.io/gh/OpenSwiftUIProject/OpenSwiftUI/commit/1f9f8d670489724d16150c778041b9eb4327d2dd?dropdown=coverage&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenSwiftUIProject).
> Report is 1 commits behind head on main.

| [Files with missing lines](https://app.codecov.io/gh/OpenSwiftUIProject/OpenSwiftUI/pull/243?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenSwiftUIProject) | Patch % | Lines |
|---|---|---|
| [Sources/OpenSwiftUICore/Layout/ZIndex.swift](https://app.codecov.io/gh/OpenSwiftUIProject/OpenSwiftUI/pull/243?src=pr&el=tree&filepath=Sources%2FOpenSwiftUICore%2FLayout%2FZIndex.swift&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenSwiftUIProject#diff-U291cmNlcy9PcGVuU3dpZnRVSUNvcmUvTGF5b3V0L1pJbmRleC5zd2lmdA==) | 0.00% | [5 Missing :warning: ](https://app.codecov.io/gh/OpenSwiftUIProject/OpenSwiftUI/pull/243?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenSwiftUIProject) |

<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
+ Coverage   20.00%   20.03%   +0.02%     
==========================================
  Files         325      326       +1     
  Lines       14583    14588       +5     
==========================================
+ Hits         2918     2922       +4     
- Misses      11665    11666       +1     
```

</details>

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</details>
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