Allows easy to use WebImage with isAnimating default to false and change to true later

Since SDAnimatedImage has fallback logic, we can apply this to WebImage by default without dynamic check

Author: dreampiggy

Example/SDWebImageSwiftUIDemo/ContentView.swift

@@ -17,6 +17,24 @@ class UserSettings: ObservableObject {
     #endif
 }
 
+struct ContentView5: View {
+    let url: URL = URL(string: "http://assets.sbnation.com/assets/2512203/dogflops.gif")!
+
+    @State private var isAnimating = false
+
+    var body: some View {
+        ZStack {
+            WebImage(url: url, isAnimating: $isAnimating)
+                .pausable(false)
+            Button {
+                isAnimating.toggle()
+            } label: {
+                Text(isAnimating ? "Stop" : "Start")
+            }
+        }
+    }
+}
+
 #if !os(watchOS)
 struct ContentView4: View {
     var url = URL(string: "https://github.com/SDWebImage/SDWebImageSwiftUI/assets/97430818/72d27f90-e9d8-48d7-b144-82ada828a027")!

SDWebImageSwiftUI/Classes/WebImage.swift

@@ -109,7 +109,7 @@ public struct WebImage<Content> : View where Content: View {
     /// - Parameter scale: The scale to use for the image. The default is 1. Set a different value when loading images designed for higher resolution displays. For example, set a value of 2 for an image that you would name with the @2x suffix if stored in a file on disk.
     /// - Parameter options: The options to use when downloading the image. See `SDWebImageOptions` for the possible values.
     /// - Parameter context: A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
-    /// - Parameter isAnimating: The binding for animation control. The binding value should be `true` when initialized to setup the correct animated image class. If not, you must provide the `.animatedImageClass` explicitly. When the animation started, this binding can been used to start / stop the animation.
+    /// - Parameter isAnimating: The binding for animation control. When the animation started, this binding can been used to start / stop the animation. You can still customize the `.animatedImageClass` context for advanced custom animation.
     public init(url: URL?, scale: CGFloat = 1, options: SDWebImageOptions = [], context: [SDWebImageContextOption : Any]? = nil, isAnimating: Binding<Bool> = .constant(true)) where Content == Image {
         self.init(url: url, options: options, context: context, isAnimating: isAnimating) { phase in
             phase.image ?? Image(platformImage: .empty)
@@ -132,11 +132,11 @@ public struct WebImage<Content> : View where Content: View {
         if context[.imageScaleFactor] == nil {
             context[.imageScaleFactor] = scale
         }
-        // provide animated image class if the initialized `isAnimating` is true, user can still custom the image class if they want
-        if isAnimating.wrappedValue {
-            if context[.animatedImageClass] == nil {
-                context[.animatedImageClass] = SDAnimatedImage.self
-            }
+        // always provide animated image class to allows dynamic control
+        // since most cases, SDAnimatedImage should be compatible with UIImage
+        // user can still custom the image class if they want
+        if context[.animatedImageClass] == nil {
+            context[.animatedImageClass] = SDAnimatedImage.self
         }
         let imageModel = WebImageModel()
         imageModel.url = url