Swizzle traitCollectionDidChange(_:) method in skeleton views

Make skeleton views respond to changes in system appearance by
updating the skeleton view whenever the trait collection changes,
so the colors change automatically with dark mode.

Sources/SkeletonView.swift

@@ -97,6 +97,11 @@ extension UIView {
         guard isSkeletonActive else { return }
         layoutSkeletonIfNeeded()
     }
+
+    @objc func skeletonTraitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+        guard isSkeletonActive, let config = currentSkeletonConfig else { return }
+        updateSkeleton(skeletonConfig: config)
+    }
 
     func showSkeleton(skeletonConfig config: SkeletonConfig) {
         isSkeletonAnimated = config.animated
@@ -109,6 +114,7 @@ extension UIView {
         guard !isSkeletonActive else { return }
         currentSkeletonConfig = config
         swizzleLayoutSubviews()
+        swizzleTraitCollectionDidChange()
         addDummyDataSourceIfNeeded()
         subviewsSkeletonables.recursiveSearch(leafBlock: {
             showSkeletonIfNotActive(skeletonConfig: config)
@@ -208,7 +214,7 @@ extension UIView {
 
     private func swizzleLayoutSubviews() {
         DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
-            DispatchQueue.once(token: "UIView.SkeletonView.swizzle") {
+            DispatchQueue.once(token: "UIView.SkeletonView.swizzleLayoutSubviews") {
                 swizzle(selector: #selector(UIView.layoutSubviews),
                         with: #selector(UIView.skeletonLayoutSubviews),
                         inClass: UIView.self,
@@ -217,6 +223,17 @@ extension UIView {
             }
         }
     }
+
+    private func swizzleTraitCollectionDidChange() {
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
+            DispatchQueue.once(token: "UIView.SkeletonView.swizzleTraitCollectionDidChange") {
+                swizzle(selector: #selector(UIView.traitCollectionDidChange(_:)),
+                        with: #selector(UIView.skeletonTraitCollectionDidChange(_:)),
+                        inClass: UIView.self,
+                        usingClass: UIView.self)
+            }
+        }
+    }
 }
 
 extension UIView {