Add Performance trace

performance/SwiftUIPerformanceQuickstart/PerformanceExample/Shared/MainView.swift

@@ -20,28 +20,32 @@ struct ImageView: View {
   @ObservedObject var process: Process
 
   var body: some View {
-    VStack {
-      if let uiImage = process.image {
-        Image(uiImage: uiImage).padding(.bottom)
-        if process.action == .classify {
-          if process.categories.isEmpty {
-            Button("Classify Image") {
-              if #available(iOS 15, tvOS 15, *) {
-                Task { await process.classifyImageAsync() }
-              } else {
-                process.classifyImage()
+    NavigationView {
+      VStack {
+        if let uiImage = process.image {
+          Image(uiImage: uiImage).padding(.bottom)
+          if process.action == .classify {
+            if process.categories.isEmpty {
+              Button("Classify Image") {
+                if #available(iOS 15, tvOS 15, *) {
+                  #if swift(>=5.5)
+                    Task { await process.classifyImageAsync() }
+                  #endif
+                } else {
+                  process.classifyImage()
+                }
+              }
+            } else {
+              Text("Categories found:")
+              List(process.categories, id: \.category) { category, confidence in
+                Text("\(category): \(confidence)")
               }
-            }
-          } else {
-            Text("Categories found:")
-            List(process.categories, id: \.category) { category, confidence in
-              Text("\(category): \(confidence)")
             }
           }
+        } else {
+          Image(systemName: "questionmark.square").padding(.bottom)
+          if process.action != .download { Text("No image found!") }
         }
-      } else {
-        Image(systemName: "questionmark.square").padding(.bottom)
-        if process.action != .download { Text("No image found!") }
       }
     }
   }
@@ -57,13 +61,17 @@ struct MainView: View {
           "\(action.rawValue) Image",
           destination: ImageView(process: process).onAppear {
             if #available(iOS 15, tvOS 15, *) {
-              process.updateActionAsync(to: action)
+              #if swift(>=5.5)
+                process.updateActionAsync(to: action)
+              #endif
             } else {
               process.updateAction(to: action)
             }
             if action == .download, process.status == .idle {
               if #available(iOS 15, tvOS 15, *) {
-                Task { await process.downloadImageAsync() }
+                #if swift(>=5.5)
+                  Task { await process.downloadImageAsync() }
+                #endif
               } else {
                 process.downloadImage()
               }

performance/SwiftUIPerformanceQuickstart/PerformanceExample/Shared/Process.swift

@@ -15,13 +15,27 @@
 //
 
 import SwiftUI
+import FirebasePerformance
 import Vision
 
 class Process: ObservableObject {
   @Published var status: ProcessStatus = .idle
   @Published var action: ProcessAction?
   @Published var image: UIImage?
   var categories: [(category: String, confidence: VNConfidence)] = []
+  let precision: Float = 0.7
+  let trace = Performance.sharedInstance().trace(name: "Classification")
+  let site = "https://firebase.google.com/downloads/brand-guidelines/PNG/logo-logomark.png"
+#if os(tvOS)
+  let platform = "tvOS"
+#elseif os(iOS)
+  let platform = "iOS"
+#endif
+
+  init() {
+    trace?.setValue("\(precision)", forAttribute: "precision")
+    trace?.setValue(platform, forAttribute: "platform")
+  }
 
   #if swift(>=5.5)
     @MainActor @available(iOS 15, tvOS 15,*) func updateStatusAsync(to newStatus: ProcessStatus) {
@@ -39,9 +53,7 @@ class Process: ObservableObject {
     @available(iOS 15, tvOS 15, *) func downloadImageAsync() async {
       await updateStatusAsync(to: .running)
 
-      guard let url =
-        URL(string: "https://www.gstatic.com/devrel-devsite/prod/v854c54f3442b5b06d9" +
-          "7cb2bf43f3647f489796c80c33899ecd29b91ae5303388/firebase/images/lockup.png")
+      guard let url = URL(string: site)
       else {
         await updateStatusAsync(to: .failure)
         print("Failure obtaining URL.")
@@ -84,7 +96,9 @@ class Process: ObservableObject {
       let handler = VNImageRequestHandler(ciImage: ciImage, options: [:])
       let request = VNClassifyImageRequest()
       await updateStatusAsync(to: .running)
+      trace?.start()
       try? handler.perform([request])
+      trace?.stop()
 
       guard let observations = request.results else {
         print("Failed to obtain classification results.")
@@ -93,7 +107,7 @@ class Process: ObservableObject {
       }
 
       categories = observations
-        .filter { $0.hasMinimumRecall(0.01, forPrecision: 0.9) }
+        .filter { $0.hasMinimumRecall(0.01, forPrecision: precision) }
         .map { ($0.identifier, $0.confidence) }
 
       await updateStatusAsync(to: .success)
@@ -116,9 +130,7 @@ class Process: ObservableObject {
 
   func downloadImage() {
     updateStatus(to: .running)
-    guard let url =
-      URL(string: "https://www.gstatic.com/devrel-devsite/prod/v854c54f3442b5b06d9" +
-        "7cb2bf43f3647f489796c80c33899ecd29b91ae5303388/firebase/images/lockup.png")
+    guard let url = URL(string: site)
     else {
       updateStatus(to: .failure)
       print("Failure obtaining URL.")
@@ -158,7 +170,9 @@ class Process: ObservableObject {
     let handler = VNImageRequestHandler(ciImage: ciImage, options: [:])
     let request = VNClassifyImageRequest()
     updateStatus(to: .running)
+    trace?.start()
     try? handler.perform([request])
+    trace?.stop()
 
     guard let observations = request.results else {
       print("Failed to obtain classification results.")
@@ -167,7 +181,7 @@ class Process: ObservableObject {
     }
 
     categories = observations
-      .filter { $0.hasMinimumRecall(0.01, forPrecision: 0.9) }
+      .filter { $0.hasMinimumRecall(0.01, forPrecision: precision) }
       .map { ($0.identifier, $0.confidence) }
 
     updateStatus(to: .success)