Add example to use gRPC-C++ pod in an iOS application

examples/cpp/helloworld/cocoapods/HelloWorldCpp/AppDelegate.h

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+//
+//  AppDelegate.h
+//  HelloWorldCpp
+//
+//  Created by Muxi Yan on 1/3/18.
+//  Copyright © 2018 gRPC. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow *window;
+
+
+@end
+

examples/cpp/helloworld/cocoapods/HelloWorldCpp/AppDelegate.mm

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+//
+//  AppDelegate.m
+//  HelloWorldCpp
+//
+//  Created by Muxi Yan on 1/3/18.
+//  Copyright © 2018 gRPC. All rights reserved.
+//
+
+#import "AppDelegate.h"
+
+@interface AppDelegate ()
+
+@end
+
+@implementation AppDelegate
+
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  // Override point for customization after application launch.
+  return YES;
+}
+
+
+- (void)applicationWillResignActive:(UIApplication *)application {
+  // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
+  // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
+}
+
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+  // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
+  // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
+}
+
+
+- (void)applicationWillEnterForeground:(UIApplication *)application {
+  // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
+}
+
+
+- (void)applicationDidBecomeActive:(UIApplication *)application {
+  // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+}
+
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+  // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+}
+
+
+@end

examples/cpp/helloworld/cocoapods/HelloWorldCpp/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

examples/cpp/helloworld/cocoapods/HelloWorldCpp/Base.lproj/LaunchScreen.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" systemVersion="17A277" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

examples/cpp/helloworld/cocoapods/HelloWorldCpp/Base.lproj/Main.storyboard

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+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" systemVersion="17A277" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

examples/cpp/helloworld/cocoapods/HelloWorldCpp/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

examples/cpp/helloworld/cocoapods/HelloWorldCpp/ViewController.h

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+//
+//  ViewController.h
+//  HelloWorldCpp
+//
+//  Created by Muxi Yan on 1/3/18.
+//  Copyright © 2018 gRPC. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+
+
+@end
+

examples/cpp/helloworld/cocoapods/HelloWorldCpp/ViewController.mm

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+//
+//  ViewController.m
+//  HelloWorldCpp
+//
+//  Created by Muxi Yan on 1/3/18.
+//  Copyright © 2018 gRPC. All rights reserved.
+//
+
+#import "ViewController.h"
+#import <grpc++/grpc++.h>
+#include <grpc++/generic/generic_stub.h>
+#include <grpc++/generic/async_generic_service.h>
+
+void* tag(int i) { return (void*)(intptr_t)i; }
+
+// Serialized Proto bytes of Hello World example
+const uint8_t message[] =
+    {0x0A, 0x0B, 0x4F, 0x62, 0x6A, 0x65, 0x63, 0x74, 0x69, 0x76, 0x65, 0x2D, 0x43};
+
+@interface ViewController ()
+
+@end
+
+@implementation ViewController {
+  grpc::CompletionQueue cli_cq_;
+  std::unique_ptr<grpc::GenericStub> generic_stub_;
+}
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  // Setup call stub
+  std::shared_ptr<grpc::Channel> channel =
+      CreateChannel("localhost:50051", grpc::InsecureChannelCredentials());
+  generic_stub_.reset(new grpc::GenericStub(channel));
+
+  const grpc::string kMethodName("/helloworld.Greeter/SayHello");
+  void* got_tag;
+  bool ok;
+
+  grpc::ClientContext cli_ctx;
+  std::unique_ptr<grpc::GenericClientAsyncReaderWriter> call =
+      generic_stub_->Call(&cli_ctx, kMethodName, &cli_cq_, tag(1));
+  cli_cq_.Next(&got_tag, &ok);
+  if (!ok || got_tag != tag(1)) {
+    NSLog(@"Failed to create call.");
+    abort();
+  }
+  grpc::Slice send_slice = grpc::Slice(message, sizeof(message) / sizeof(message[0]));
+      std::unique_ptr<grpc::ByteBuffer> send_buffer(new grpc::ByteBuffer(&send_slice, 1));
+  call->Write(*send_buffer, tag(2));
+  cli_cq_.Next(&got_tag, &ok);
+  if (!ok || got_tag != tag(2)) {
+    NSLog(@"Failed to send message.");
+    abort();
+  }
+  grpc::ByteBuffer recv_buffer;
+  call->Read(&recv_buffer, tag(3));
+  cli_cq_.Next(&got_tag, &ok);
+  if (!ok || got_tag != tag(3)) {
+    NSLog(@"Failed to receive message.");
+    abort();
+  }
+
+  grpc::Status status;
+  call->Finish(&status, tag(4));
+  cli_cq_.Next(&got_tag, &ok);
+  if (!ok || got_tag != tag(4)) {
+    NSLog(@"Failed to finish call.");
+    abort();
+  }
+  if (!status.ok()) {
+    NSLog(@"Received unsuccessful status code: %d", status.error_code());
+    abort();
+  }
+  std::vector<grpc::Slice> slices;
+  recv_buffer.Dump(&slices);
+  NSString *recvBytes = [[NSString alloc] init];
+  for (auto slice : slices) {
+    auto p = slice.begin();
+    while (p != slice.end()) {
+      recvBytes =
+          [recvBytes stringByAppendingString:[NSString stringWithFormat:@"%02x ", *p]];
+      p++;
+    }
+  }
+  NSLog(@"Hello World succeeded.\nReceived bytes: %@\n"
+        "Expected bytes: 0a 11 48 65 6c 6c 6f 20 4f 62 6a 65 63 74 69 76 65 2d 43", recvBytes);
+}
+
+
+- (void)didReceiveMemoryWarning {
+  [super didReceiveMemoryWarning];
+}
+
+
+@end

examples/cpp/helloworld/cocoapods/HelloWorldCpp/main.m

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+//
+//  main.m
+//  HelloWorldCpp
+//
+//  Created by Muxi Yan on 1/3/18.
+//  Copyright © 2018 gRPC. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+  @autoreleasepool {
+      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}