[platform_channels] adds ios implementation for MethodChannel demo (#563)

platform_channels/ios/Flutter/.last_build_id

@@ -0,0 +1 @@
+dad366ac47fa5a1d30c8533697937d44

platform_channels/ios/Runner.xcodeproj/project.pbxproj

@@ -241,7 +241,6 @@
 /* Begin XCBuildConfiguration section */
 		249021D3217E4FDB00AE95B9 /* Profile */ = {
 			isa = XCBuildConfiguration;
-			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -318,7 +317,6 @@
 		};
 		97C147031CF9000F007C117D /* Debug */ = {
 			isa = XCBuildConfiguration;
-			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -374,7 +372,6 @@
 		};
 		97C147041CF9000F007C117D /* Release */ = {
 			isa = XCBuildConfiguration;
-			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;

platform_channels/ios/Runner/AppDelegate.swift

@@ -7,6 +7,25 @@ import Flutter
         _ application: UIApplication,
         didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
     ) -> Bool {
+        let flutterViewController = window.rootViewController as! FlutterViewController
+        FlutterMethodChannel(name: "methodChannelDemo", binaryMessenger: flutterViewController.binaryMessenger).setMethodCallHandler({
+            (call: FlutterMethodCall, result: FlutterResult) -> Void in
+            
+            guard let count = (call.arguments as? NSDictionary)?["count"] as? Int else {
+                result(FlutterError(code: "INVALID_ARGUMENT", message: "Value of count cannot be null", details: nil))
+                return
+            }
+            
+            switch call.method {
+            case "increment":
+                result(count + 1)
+            case "decrement":
+                result(count - 1)
+            default:
+                result(FlutterMethodNotImplemented)
+            }
+        })
+        
         GeneratedPluginRegistrant.register(with: self)
         return super.application(application, didFinishLaunchingWithOptions: launchOptions)
     }