Add retryOnAppear and cancelOnDisappear behavior control

SDWebImageSwiftUI/Classes/WebImage.swift

@@ -16,9 +16,12 @@ public struct WebImage : View {
  var options: SDWebImageOptions
  var context: [SDWebImageContextOption : Any]?
 
- var placeholder: AnyView?
  var configurations: [(Image) -> Image] = []
 
+ var placeholder: AnyView?
+ var retryOnAppear: Bool = true
+ var cancelOnDisappear: Bool = true
+
  @ObservedObject var imageManager: ImageManager
 
  /// Create a web image with url, placeholder, custom options and context.
@@ -50,11 +53,13 @@ public struct WebImage : View {
  }
  }
  .onAppear {
+ guard self.retryOnAppear else { return }
  if !self.imageManager.isFinished {
  self.imageManager.load()
  }
  }
  .onDisappear {
+ guard self.cancelOnDisappear else { return }
  // When using prorgessive loading, the previous partial image will cause onDisappear. Filter this case
  if self.imageManager.isLoading && !self.imageManager.isIncremental {
  self.imageManager.cancel()
@@ -133,7 +138,7 @@ extension WebImage {
  }
 }
 
-// Placeholder
+// Custom Configuration
 extension WebImage {
 
  /// Associate a placeholder when loading image with url
@@ -144,6 +149,22 @@ extension WebImage {
  result.placeholder = AnyView(content())
  return result
  }
+
+ /// Control the behavior to retry the failed loading when view become appears again
+ /// - Parameter flag: Whether or not to retry the failed loading
+ public func retryOnAppear(_ flag: Bool) -> WebImage {
+ var result = self
+ result.retryOnAppear = flag
+ return result
+ }
+
+ /// Control the behavior to cancel the pending loading when view become disappear again
+ /// - Parameter flag: Whether or not to cancel the pending loading
+ public func cancelOnDisappear(_ flag: Bool) -> WebImage {
+ var result = self
+ result.cancelOnDisappear = flag
+ return result
+ }
 }
 
 // Indicator