Feature Extend a property backgroundViewColor for UIStackView to set its background color

CHANGELOG.md

@@ -31,6 +31,8 @@ The changelog for **SwifterSwift**. Also see the [releases](https://github.com/S
   - Added `allQueryParameters`, `appendingQueryParameters(_:)` and `appendQueryParameters(_:)` for using `URLQueryItem`, as an addition to the `[String: String]` variants, to handle `nil`-value query parameters. [#1116](https://github.com/SwifterSwift/SwifterSwift/issues/1116) by [guykogus](https://github.com/guykogus)
 - **URLSession**
   - Added `dataSync(for:)` to make requests synchronously. [#1076](https://github.com/SwifterSwift/SwifterSwift/pull/1076) by [Roman Podymov](https://github.com/RomanPodymov)
+- **UIStackView**
+  - Added `backgroundViewColor` to add background color. [#1127](https://github.com/SwifterSwift/SwifterSwift/pull/1127) by [WZBbiao](https://github.com/WZBbiao)
 
 ### Changed
 - **UIButton**:

Sources/SwifterSwift/UIKit/UIStackViewExtensions.swift

@@ -6,6 +6,44 @@ import UIKit
 // MARK: - Initializers
 
 public extension UIStackView {
+    private class BackgroundView: UIView { }
+
+    /// SwifterSwift: Add background color to UIStackView
+    var backgroundViewColor: UIColor? {
+        get {
+            if #available(iOS 14.0, *) {
+                return backgroundColor
+            } else {
+                for subview in subviews {
+                    if subview is BackgroundView {
+                        return subview.backgroundColor
+                    }
+                }
+                return nil
+            }
+        }
+        set {
+            if #available(iOS 14.0, *) {
+                backgroundColor = newValue
+            } else {
+                if let existingBackgroundView = subviews.first(where: { $0 is BackgroundView }) {
+                    existingBackgroundView.backgroundColor = newValue
+                } else {
+                    let backgroundView = BackgroundView()
+                    backgroundView.backgroundColor = newValue
+                    insertSubview(backgroundView, at: 0)
+                    backgroundView.translatesAutoresizingMaskIntoConstraints = false
+                    NSLayoutConstraint.activate([
+                        backgroundView.topAnchor.constraint(equalTo: topAnchor),
+                        backgroundView.leadingAnchor.constraint(equalTo: leadingAnchor),
+                        backgroundView.bottomAnchor.constraint(equalTo: bottomAnchor),
+                        backgroundView.trailingAnchor.constraint(equalTo: trailingAnchor)
+                    ])
+                }
+            }
+        }
+    }
+
     /// SwifterSwift: Initialize an UIStackView with an array of UIView and common parameters.
     ///
     ///     let stackView = UIStackView(arrangedSubviews: [UIView(), UIView()], axis: .vertical)

Tests/UIKitTests/UIStackViewExtensionsTests.swift

@@ -88,6 +88,21 @@ final class UIStackViewExtensionsTest: XCTestCase {
         XCTAssertEqual(stack.arrangedSubviews.firstIndex(of: view4), 0)
         waitForExpectations(timeout: 1.0)
     }
+
+    func testBackgroundViewColor() {
+        let stack = UIStackView()
+        stack.backgroundViewColor = nil
+        XCTAssertNil(stack.backgroundViewColor)
+
+        stack.backgroundViewColor = .red
+        XCTAssertNotNil(stack.backgroundViewColor)
+
+        XCTAssertEqual(stack.backgroundViewColor!, UIColor.red)
+
+        if #available(iOS 14, *) {
+            XCTAssertEqual(stack.backgroundColor!, UIColor.red)
+        }
+    }
 }
 
 #endif