Fix existential any (#199)

Author: kitwtnb

Sources/Gifu/Classes/Animator.swift

@@ -20,7 +20,7 @@ public class Animator {
   private var displayLinkInitialized: Bool = false
 
   /// A delegate responsible for displaying the GIF frames.
-  private weak var delegate: GIFAnimatable!
+  private weak var delegate: (any GIFAnimatable)!
 
   /// Callback for when all the loops of the animation are done (never called for infinite loops)
   private var animationBlock: (() -> Void)? = nil
@@ -55,7 +55,7 @@ public class Animator {
   /// - parameter view: A view object that implements the `GIFAnimatable` protocol.
   ///
   /// - returns: A new animator instance.
-  public init(withDelegate delegate: GIFAnimatable) {
+  public init(withDelegate delegate: any GIFAnimatable) {
     self.delegate = delegate
   }
 

Sources/Gifu/Classes/GIFAnimatable.swift

@@ -133,7 +133,7 @@ extension GIFAnimatable {
   public func prepareForAnimation(withGIFData imageData: Data,
                                   loopCount: Int = 0,
                                   completionHandler: (() -> Void)? = nil) {
-    if var imageContainer = self as? ImageContainer {
+    if var imageContainer = self as? any ImageContainer {
       imageContainer.image = UIImage(data: imageData)
     }
 
@@ -209,7 +209,7 @@ extension GIFAnimatable {
 
   /// Updates the image with a new frame if necessary.
   public func updateImageIfNeeded() {
-    if var imageContainer = self as? ImageContainer {
+    if var imageContainer = self as? any ImageContainer {
       let container = imageContainer
       imageContainer.image = activeFrame ?? container.image
     } else {