Support state changes

Sources/SwiftUIVisualEffects/Wrappers/VibrancyVisualEffectViewRepresentable.swift

@@ -10,28 +10,44 @@ struct _VibrancyVisualEffectViewRepresentable<Content: View>: UIViewRepresentabl
 		self.content = content
 	}
 	
+	func makeCoordinator() -> Coordinator {
+		Coordinator(content: content)
+	}
+	
 	func makeUIView(context: Context) -> UIVisualEffectView {
-		let blurEffect = UIBlurEffect(style: context.environment.blurEffectStyle)
-		let visualEffectView = UIVisualEffectView()
-		
-		// Set `visualEffectView`'s `effect`.
-		if let vibrancyEffectStyle = context.environment.vibrancyEffectStyle {
-			visualEffectView.effect = UIVibrancyEffect(blurEffect: blurEffect, style: vibrancyEffectStyle)
-		} else {
-			visualEffectView.effect = UIVibrancyEffect(blurEffect: blurEffect)
-		}
-		
-		// Embed `content` in `visualEffectView`'s `contentView`.
-		let hostingControllerView = UIHostingController(rootView: content).view!
-		// Center `hostingControllerView`'s frame (at the cost of losing its intrinsic content size).
-		hostingControllerView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
-		hostingControllerView.backgroundColor = .clear
-		visualEffectView.contentView.addSubview(hostingControllerView)
-		
-		return visualEffectView
+		context.coordinator.configuredVisualEffectView(from: context)
 	}
 	
-	func updateUIView(_ uiView: UIVisualEffectView, context: Context) {}
+	func updateUIView(_ uiView: UIVisualEffectView, context: Context) {
+		context.coordinator.configuredVisualEffectView(from: context)
+	}
 	
 	private let content: Content
 }
+
+extension _VibrancyVisualEffectViewRepresentable {
+	final class Coordinator {
+		init(content: Content) {
+			let hostingController = UIHostingController(rootView: content)
+			hostingController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+			hostingController.view.backgroundColor = nil
+			
+			visualEffectView.contentView.addSubview(hostingController.view)
+		}
+		
+		@discardableResult func configuredVisualEffectView(from context: Context) -> UIVisualEffectView {
+			let blurEffect = UIBlurEffect(style: context.environment.blurEffectStyle)
+			
+			// Set `visualEffectView`'s `effect`.
+			if let vibrancyEffectStyle = context.environment.vibrancyEffectStyle {
+				visualEffectView.effect = UIVibrancyEffect(blurEffect: blurEffect, style: vibrancyEffectStyle)
+			} else {
+				visualEffectView.effect = UIVibrancyEffect(blurEffect: blurEffect)
+			}
+			
+			return visualEffectView
+		}
+		
+		private let visualEffectView = UIVisualEffectView()
+	}
+}