fix: update placeholder when appearance style changes

Author: mikhailChelbaev

Sources/ComponentsKit/Components/Avatar/Helpers/AvatarImageManager.swift

@@ -5,7 +5,7 @@ final class AvatarImageManager: ObservableObject {
   @Published var avatarImage: UIImage
 
   private var model: AvatarVM
-  private var remoteImagesCache = NSCache<NSString, UIImage>()
+  private static var remoteImagesCache = NSCache<NSString, UIImage>()
 
   init(model: AvatarVM) {
     self.model = model
@@ -27,7 +27,7 @@ final class AvatarImageManager: ObservableObject {
 
     switch model.imageSrc {
     case .remote(let url):
-      if let image = self.remoteImagesCache.object(forKey: url.absoluteString as NSString) {
+      if let image = Self.remoteImagesCache.object(forKey: url.absoluteString as NSString) {
         self.avatarImage = image
       } else {
         self.avatarImage = model.placeholderImage(for: size)
@@ -47,7 +47,7 @@ final class AvatarImageManager: ObservableObject {
             let image = UIImage(data: data)
       else { return }
 
-      self.remoteImagesCache.setObject(image, forKey: url.absoluteString as NSString)
+      Self.remoteImagesCache.setObject(image, forKey: url.absoluteString as NSString)
 
       if url == self.model.imageURL {
         self.avatarImage = image

Sources/ComponentsKit/Components/Avatar/SUAvatar.swift

@@ -8,6 +8,7 @@ public struct SUAvatar: View {
   public var model: AvatarVM
 
   @StateObject private var imageManager: AvatarImageManager
+  @Environment(\.colorScheme) private var colorScheme
 
   // MARK: - Initialization
 
@@ -37,5 +38,8 @@ public struct SUAvatar: View {
       .onChange(of: self.model) { newValue in
         self.imageManager.update(model: newValue, size: newValue.preferredSize)
       }
+      .onChange(of: self.colorScheme) { _ in
+        self.imageManager.update(model: self.model, size: self.model.preferredSize)
+      }
   }
 }

Sources/ComponentsKit/Components/Avatar/UKAvatar.swift

@@ -46,6 +46,12 @@ open class UKAvatar: UIImageView, UKComponent {
     self.cancellable = self.imageManager.$avatarImage
       .receive(on: DispatchQueue.main)
       .sink { self.image = $0 }
+
+    if #available(iOS 17.0, *) {
+      self.registerForTraitChanges([UITraitUserInterfaceStyle.self]) { (view: Self, _: UITraitCollection) in
+        view.handleTraitChanges()
+      }
+    }
   }
 
   // MARK: - Style
@@ -89,4 +95,17 @@ open class UKAvatar: UIImageView, UKComponent {
     let side = min(minProvidedSide, minPreferredSide)
     return CGSize(width: side, height: side)
   }
+
+  open override func traitCollectionDidChange(
+    _ previousTraitCollection: UITraitCollection?
+  ) {
+    super.traitCollectionDidChange(previousTraitCollection)
+    self.handleTraitChanges()
+  }
+
+  // MARK: Helpers
+
+  @objc private func handleTraitChanges() {
+    self.imageManager.update(model: self.model, size: self.bounds.size)
+  }
 }