Update the readme demo code to use swifty syntax

Author: dreampiggy

Example/SDWebImageSwiftUIDemo/ContentView.swift

@@ -94,11 +94,11 @@ struct ContentView: View {
                     }
                 }
             }
-            .onDelete(perform: { (indexSet) in
-                indexSet.forEach { (index) in
+            .onDelete { indexSet in
+                indexSet.forEach { index in
                     self.imageURLs.remove(at: index)
                 }
-            })
+            }
         }
     }
 

Example/SDWebImageSwiftUIDemo/DetailView.swift

@@ -53,25 +53,25 @@ struct DetailView: View {
         HStack {
             if animated {
                 AnimatedImage(url: URL(string:url), options: [.progressiveLoad], isAnimating: $isAnimating)
-                .onProgress(perform: { (receivedSize, expectedSize) in
+                .onProgress { receivedSize, expectedSize in
                     // SwiftUI engine itself ensure the main queue dispatch
-                    if (expectedSize >= 0) {
+                    if (expectedSize > 0) {
                         self.progress = CGFloat(receivedSize) / CGFloat(expectedSize)
                     } else {
                         self.progress = 1
                     }
-                })
+                }
                 .resizable()
                 .scaledToFit()
             } else {
                 WebImage(url: URL(string:url), options: [.progressiveLoad])
-                .onProgress(perform: { (receivedSize, expectedSize) in
-                    if (expectedSize >= 0) {
+                .onProgress { receivedSize, expectedSize in
+                    if (expectedSize > 0) {
                         self.progress = CGFloat(receivedSize) / CGFloat(expectedSize)
                     } else {
                         self.progress = 1
                     }
-                })
+                }
                 .resizable()
                 .scaledToFit()
             }

README.md

@@ -71,9 +71,9 @@ Note: Unlike `UIImageView` in UIKit, SwiftUI's `Image` does not support animatio
 ```swift
 var body: some View {
     WebImage(url: URL(string: "https://nokiatech.github.io/heif/content/images/ski_jump_1440x960.heic"))
-        .onSuccess(perform: { (image, cacheType) in
+        .onSuccess { image, cacheType in
             // Success
-        })
+        }
         .resizable()
         .scaledToFit()
         .frame(width: 300, height: 300, alignment: .center)
@@ -87,9 +87,9 @@ var body: some View {
     Group {
         // Network
         AnimatedImage(url: URL(string: "https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif"))
-        .onFailure(perform: { (error) in
+        .onFailure { error in
             // Error
-        })
+        }
         .scaledToFit()
         // Data
         AnimatedImage(data: try! Data(contentsOf: URL(fileURLWithPath: "/tmp/foo.webp")))