Add Mac Catalyst platform condition to open GitHub repo.

Author: yo1995

Shared/Supporting Files/Views/SampleDetailView.swift

@@ -84,7 +84,10 @@ struct SampleDetailView: View {
         .navigationTitle(sample.name)
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
-            ToolbarItem(placement: .topBarTrailing) {
+            ToolbarItemGroup(placement: .topBarTrailing) {
+#if targetEnvironment(macCatalyst)
+                Link("View on GitHub", destination: .samplesDirectory.appendingPathComponent(sample.name))
+#endif
                 Button {
                     isSampleInfoViewPresented = true
                 } label: {
@@ -109,3 +112,10 @@ struct SampleDetailView: View {
 extension SampleDetailView: Identifiable {
     var id: String { sample.nameInUpperCamelCase }
 }
+
+private extension URL {
+    /// The URL to the Samples sub-directory on GitHub's main branch.
+    static let samplesDirectory = URL(
+        string: "https://github.com/Esri/arcgis-maps-sdk-swift-samples"
+    )!.appendingPathComponent("tree/main/Shared/Samples")
+}