根据反馈更新代码示例

BreastFeedingDemo/AppDelegate.swift

@@ -5,17 +5,11 @@
 //  Created by Jay Zhang on 2022/6/2.
 //
 
-import Flutter
-import FlutterPluginRegistrant
 import UIKit
 
 @main
 class AppDelegate: UIResponder, UIApplicationDelegate {
-    lazy var flutterEngine = FlutterEngine(name: "my flutter engine")
-
     func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
-        flutterEngine.run()
-        GeneratedPluginRegistrant.register(with: flutterEngine)
         return true
     }
 

BreastFeedingDemo/ViewController/BaseLandingVC.swift

@@ -55,12 +55,10 @@ class BaseLandingVC: UIViewController {
     }
 
     func showFlutterScreen() {
-        if let flutterEngine = (UIApplication.shared.delegate as? AppDelegate)?.flutterEngine {
-            let scanVC = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
+        let scanVC = FlutterViewController(engine: viewModel.flutterEngine, nibName: nil, bundle: nil)
         scanVC.modalPresentationStyle = .overFullScreen
         navigationController?.pushViewController(scanVC, animated: true)
     }
-    }
 
     @IBAction func startAction(_: Any) {
         if checkCameraPermission() == false {

BreastFeedingDemo/ViewModel.swift

@@ -5,14 +5,16 @@
 //  Created by Jay Zhang on 2022/6/5.
 //
 
-import Foundation
 import Flutter
+import FlutterPluginRegistrant
+import Foundation
 
 class ViewModel {
     enum Posture: Int {
         case cradle = 0
         case lying = 1
     }
+
     /// 语言枚举，enum代表语言包文件名，rawValue代表语言选项
     enum Language: String, CaseIterable {
         case english = "English"
@@ -30,6 +32,7 @@ class ViewModel {
         }
     }
 
+    var flutterEngine: FlutterEngine!
     var posture: Posture = .cradle
 
     var string: StringModel!
@@ -59,36 +62,34 @@ class ViewModel {
     }
 
     var methodChannel: FlutterMethodChannel!
-    var completeHandler: (()->())?
-    var teachingEndHandler: (()->())?
+    var completeHandler: (() -> Void)?
+    var teachingEndHandler: (() -> Void)?
 
     init() {
         language = .english
         setupText()
-        methodChannel = setupFlutter()
+        runFlutterEngine()
+        methodChannel = setupMethodCallHandler()
+    }
+
+    func runFlutterEngine() {
+        flutterEngine = FlutterEngine(name: "my flutter engine")
+        flutterEngine.run()
+        GeneratedPluginRegistrant.register(with: flutterEngine)
     }
 
-    func setupFlutter() -> FlutterMethodChannel {
-        let flutterEngine = (UIApplication.shared.delegate as? AppDelegate)?.flutterEngine
-        let methodChannel = FlutterMethodChannel(name: "com.wmdigit.breastcoachai.native",
-                                             binaryMessenger: flutterEngine!.binaryMessenger)
+    func setupMethodCallHandler() -> FlutterMethodChannel {
+        let binaryMessenger = flutterEngine.binaryMessenger
+        let methodChannel = FlutterMethodChannel(name: "com.wmdigit.breastcoachai.native", binaryMessenger: binaryMessenger)
         methodChannel.setMethodCallHandler { [weak self]
             (call: FlutterMethodCall, result: @escaping FlutterResult) in
-                if let strongSelf = self {
+                if let self = self {
                     switch call.method {
                     case "init":
-                        result(viewModel.flutterArguments)
+                        let params = self.initLanguagePack() // 生成JSON格式的语言包
+                        result(params) // 初始化
                     case "teachingEnd":
-                        strongSelf.methodChannel.invokeMethod("dispose", arguments: nil)
-                        // ["totalDuration": 3, "reasonText": Concern about my personal privacy, "status": incomplete, "incompleteReasonCode": 2]
-                        let argument: [String: Any] = try! JSONSerialization.jsonObject(with: (call.arguments as! String).data(using: .utf8)!) as! [String: Any]
-
-                        let status: String = argument["status"] as! String
-                        if status == "complete" {
-                            strongSelf.completeHandler?()
-                            return
-                        }
-                        strongSelf.teachingEndHandler?()
+                        self.methodChannel.invokeMethod("dispose", arguments: nil)
                     default:
                         // Unrecognized method name
                         print("Unrecognized method name: \(call.method)")
@@ -98,6 +99,10 @@ class ViewModel {
         return methodChannel
     }
 
+    fileprivate func initLanguagePack() -> String {
+        return viewModel.flutterArguments
+    }
+
     fileprivate func setupText() {
         let languageFile = "string_\(language)".appending(".json")
         let path: String = Bundle.main.path(forResource: languageFile, ofType: nil)!