diff --git a/objective-c/auth_sample/AuthSample.xcodeproj/project.pbxproj b/objective-c/auth_sample/AuthSample.xcodeproj/project.pbxproj
index a3ea799..dd4778e 100644
--- a/objective-c/auth_sample/AuthSample.xcodeproj/project.pbxproj
+++ b/objective-c/auth_sample/AuthSample.xcodeproj/project.pbxproj
@@ -9,7 +9,7 @@
 /* Begin PBXBuildFile section */
 		63E1E9821B28CB2100EF0978 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 63E1E9811B28CB2100EF0978 /* main.m */; };
 		63E1E9851B28CB2100EF0978 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 63E1E9841B28CB2100EF0978 /* AppDelegate.m */; };
-		63E1E9881B28CB2100EF0978 /* FirstViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 63E1E9871B28CB2100EF0978 /* FirstViewController.m */; };
+		63E1E9881B28CB2100EF0978 /* SelectUserViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 63E1E9871B28CB2100EF0978 /* SelectUserViewController.m */; };
 		63E1E98B1B28CB2100EF0978 /* SecondViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 63E1E98A1B28CB2100EF0978 /* SecondViewController.m */; };
 		63E1E98E1B28CB2100EF0978 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 63E1E98C1B28CB2100EF0978 /* Main.storyboard */; };
 		63E1E9901B28CB2100EF0978 /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 63E1E98F1B28CB2100EF0978 /* Images.xcassets */; };
@@ -23,8 +23,8 @@
 		63E1E9811B28CB2100EF0978 /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
 		63E1E9831B28CB2100EF0978 /* AppDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
 		63E1E9841B28CB2100EF0978 /* AppDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
-		63E1E9861B28CB2100EF0978 /* FirstViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = FirstViewController.h; sourceTree = "<group>"; };
-		63E1E9871B28CB2100EF0978 /* FirstViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = FirstViewController.m; sourceTree = "<group>"; };
+		63E1E9861B28CB2100EF0978 /* SelectUserViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SelectUserViewController.h; sourceTree = "<group>"; };
+		63E1E9871B28CB2100EF0978 /* SelectUserViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SelectUserViewController.m; sourceTree = "<group>"; };
 		63E1E9891B28CB2100EF0978 /* SecondViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SecondViewController.h; sourceTree = "<group>"; };
 		63E1E98A1B28CB2100EF0978 /* SecondViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SecondViewController.m; sourceTree = "<group>"; };
 		63E1E98D1B28CB2100EF0978 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
@@ -85,8 +85,8 @@
 		63E1E97E1B28CB2100EF0978 /* AuthSample */ = {
 			isa = PBXGroup;
 			children = (
-				63E1E9861B28CB2100EF0978 /* FirstViewController.h */,
-				63E1E9871B28CB2100EF0978 /* FirstViewController.m */,
+				63E1E9861B28CB2100EF0978 /* SelectUserViewController.h */,
+				63E1E9871B28CB2100EF0978 /* SelectUserViewController.m */,
 				63E1E9891B28CB2100EF0978 /* SecondViewController.h */,
 				63E1E98A1B28CB2100EF0978 /* SecondViewController.m */,
 				63F5DE471B28F5C100CDD07E /* GoogleService-Info.plist */,
@@ -216,7 +216,7 @@
 			files = (
 				63E1E98B1B28CB2100EF0978 /* SecondViewController.m in Sources */,
 				63E1E9851B28CB2100EF0978 /* AppDelegate.m in Sources */,
-				63E1E9881B28CB2100EF0978 /* FirstViewController.m in Sources */,
+				63E1E9881B28CB2100EF0978 /* SelectUserViewController.m in Sources */,
 				63E1E9821B28CB2100EF0978 /* main.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/objective-c/auth_sample/Misc/AppDelegate.m b/objective-c/auth_sample/Misc/AppDelegate.m
index a38e366..798d342 100644
--- a/objective-c/auth_sample/Misc/AppDelegate.m
+++ b/objective-c/auth_sample/Misc/AppDelegate.m
@@ -33,5 +33,29 @@
 
 #import "AppDelegate.h"
 
+#import <Google/SignIn.h>
+
 @implementation AppDelegate
+
+// As instructed in https://developers.google.com/identity/sign-in/ios/sign-in
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  NSError* configureError;
+  [GGLContext.sharedInstance configureWithError: &configureError];
+  NSAssert(!configureError, @"Error configuring Google services: %@", configureError);
+
+  return YES;
+}
+
+// As instructed in https://developers.google.com/identity/sign-in/ios/sign-in
+- (BOOL)application:(UIApplication *)application
+            openURL:(NSURL *)url
+  sourceApplication:(NSString *)sourceApplication
+         annotation:(id)annotation {
+  // This will properly handle the URL that the application receives at the end of the
+  // authentication process.
+  return [GIDSignIn.sharedInstance handleURL:url
+                           sourceApplication:sourceApplication
+                                  annotation:annotation];
+}
+
 @end
diff --git a/objective-c/auth_sample/Misc/Base.lproj/Main.storyboard b/objective-c/auth_sample/Misc/Base.lproj/Main.storyboard
index 5258761..761e7bf 100644
--- a/objective-c/auth_sample/Misc/Base.lproj/Main.storyboard
+++ b/objective-c/auth_sample/Misc/Base.lproj/Main.storyboard
@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="49e-Tb-3d3">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="7702" systemVersion="14D131" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="49e-Tb-3d3">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7701"/>
     </dependencies>
     <scenes>
-        <!--First-->
+        <!--Select User-->
         <scene sceneID="hNz-n2-bh7">
             <objects>
-                <viewController id="9pv-A4-QxB" customClass="FirstViewController" customModuleProvider="" sceneMemberID="viewController">
+                <viewController id="9pv-A4-QxB" userLabel="Select User" customClass="SelectUserViewController" sceneMemberID="viewController">
                     <layoutGuides>
                         <viewControllerLayoutGuide type="top" id="Ia1-K6-d13"/>
                         <viewControllerLayoutGuide type="bottom" id="4ug-Mw-9AY"/>
@@ -16,29 +16,75 @@
                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleToFill" text="First View" textAlignment="center" lineBreakMode="tailTruncation" minimumFontSize="10" translatesAutoresizingMaskIntoConstraints="NO" id="KQZ-1w-vlD">
-                                <rect key="frame" x="221" y="279" width="157.5" height="41.5"/>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleToFill" text="Please sign in." textAlignment="center" lineBreakMode="tailTruncation" minimumFontSize="10" translatesAutoresizingMaskIntoConstraints="NO" id="KQZ-1w-vlD" userLabel="Main Label">
+                                <rect key="frame" x="222" y="190" width="157" height="28"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
-                                <fontDescription key="fontDescription" name="Helvetica" family="Helvetica" pointSize="36"/>
+                                <fontDescription key="fontDescription" name="Helvetica" family="Helvetica" pointSize="24"/>
                                 <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                 <nil key="highlightedColor"/>
                             </label>
-                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Loaded by FirstViewController" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="A5M-7J-77L">
-                                <rect key="frame" x="203" y="329" width="194.5" height="17"/>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="A5M-7J-77L" userLabel="Sub Label">
+                                <rect key="frame" x="301" y="226" width="0.0" height="0.0"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                 <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                 <nil key="highlightedColor"/>
                             </label>
+                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="W20-aa-6Xr">
+                                <rect key="frame" x="150" y="370" width="300" height="50"/>
+                                <subviews>
+                                    <view contentMode="center" translatesAutoresizingMaskIntoConstraints="NO" id="25e-pE-eb8" customClass="GIDSignInButton">
+                                        <rect key="frame" x="42" y="0.0" width="216" height="77"/>
+                                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                                        <constraints>
+                                            <constraint firstAttribute="width" constant="216" placeholder="YES" id="Gfn-Hn-HXd"/>
+                                            <constraint firstAttribute="height" constant="77" placeholder="YES" id="cy1-xY-er0"/>
+                                        </constraints>
+                                    </view>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="RKb-EE-mCZ">
+                                        <rect key="frame" x="0.0" y="0.0" width="300" height="42"/>
+                                        <color key="backgroundColor" red="0.0" green="0.50196081399917603" blue="1" alpha="1" colorSpace="calibratedRGB"/>
+                                        <constraints>
+                                            <constraint firstAttribute="width" constant="300" id="ILy-QC-YPq"/>
+                                            <constraint firstAttribute="height" constant="42" id="MFs-aL-fQF"/>
+                                        </constraints>
+                                        <fontDescription key="fontDescription" type="boldSystem" pointSize="14"/>
+                                        <color key="tintColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                                        <state key="normal" title="Sign out">
+                                            <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                                        </state>
+                                        <connections>
+                                            <action selector="didTapSignOut" destination="9pv-A4-QxB" eventType="touchUpInside" id="lcC-7k-Rki"/>
+                                        </connections>
+                                    </button>
+                                </subviews>
+                                <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                                <constraints>
+                                    <constraint firstAttribute="centerX" secondItem="25e-pE-eb8" secondAttribute="centerX" id="47f-A8-C2R"/>
+                                    <constraint firstAttribute="height" constant="50" id="EDJ-oo-Ix4"/>
+                                    <constraint firstItem="25e-pE-eb8" firstAttribute="top" secondItem="W20-aa-6Xr" secondAttribute="top" id="KSP-qb-mCJ"/>
+                                    <constraint firstItem="RKb-EE-mCZ" firstAttribute="top" secondItem="W20-aa-6Xr" secondAttribute="top" id="QDr-HV-DXb"/>
+                                    <constraint firstAttribute="width" constant="300" id="zWU-pZ-oQ7"/>
+                                    <constraint firstAttribute="centerX" secondItem="RKb-EE-mCZ" secondAttribute="centerX" id="zwy-cD-xao"/>
+                                </constraints>
+                            </view>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                         <constraints>
                             <constraint firstAttribute="centerX" secondItem="KQZ-1w-vlD" secondAttribute="centerX" id="6BV-lF-sBN"/>
+                            <constraint firstItem="KQZ-1w-vlD" firstAttribute="top" secondItem="Ia1-K6-d13" secondAttribute="bottom" constant="170" id="82x-jY-eWa"/>
+                            <constraint firstAttribute="centerX" secondItem="W20-aa-6Xr" secondAttribute="centerX" id="aHL-Ts-LoW"/>
                             <constraint firstItem="A5M-7J-77L" firstAttribute="top" secondItem="KQZ-1w-vlD" secondAttribute="bottom" constant="8" symbolic="YES" id="cfb-er-3JN"/>
                             <constraint firstItem="A5M-7J-77L" firstAttribute="centerX" secondItem="KQZ-1w-vlD" secondAttribute="centerX" id="e1l-AV-tCB"/>
-                            <constraint firstAttribute="centerY" secondItem="KQZ-1w-vlD" secondAttribute="centerY" id="exm-UA-ej4"/>
+                            <constraint firstItem="W20-aa-6Xr" firstAttribute="top" secondItem="Ia1-K6-d13" secondAttribute="bottom" constant="350" id="pab-Li-xZ5"/>
                         </constraints>
                     </view>
-                    <tabBarItem key="tabBarItem" title="First" image="first" id="acW-dT-cKf"/>
+                    <tabBarItem key="tabBarItem" title="Select User" image="first" id="acW-dT-cKf"/>
+                    <connections>
+                        <outlet property="mainLabel" destination="KQZ-1w-vlD" id="fWK-H9-WXN"/>
+                        <outlet property="signInButton" destination="25e-pE-eb8" id="ovt-t5-7BV"/>
+                        <outlet property="signOutButton" destination="RKb-EE-mCZ" id="afy-Q6-rK8"/>
+                        <outlet property="subLabel" destination="A5M-7J-77L" id="DIj-ZX-1NK"/>
+                    </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="W5J-7L-Pyd" sceneMemberID="firstResponder"/>
             </objects>
@@ -47,7 +93,7 @@
         <!--Second-->
         <scene sceneID="wg7-f3-ORb">
             <objects>
-                <viewController id="8rJ-Kc-sve" customClass="SecondViewController" customModuleProvider="" sceneMemberID="viewController">
+                <viewController id="8rJ-Kc-sve" customClass="SecondViewController" sceneMemberID="viewController">
                     <layoutGuides>
                         <viewControllerLayoutGuide type="top" id="L7p-HK-0SC"/>
                         <viewControllerLayoutGuide type="bottom" id="Djb-ko-YwX"/>
diff --git a/objective-c/auth_sample/FirstViewController.h b/objective-c/auth_sample/SelectUserViewController.h
similarity index 81%
rename from objective-c/auth_sample/FirstViewController.h
rename to objective-c/auth_sample/SelectUserViewController.h
index 9630f4d..eb3c2cf 100644
--- a/objective-c/auth_sample/FirstViewController.h
+++ b/objective-c/auth_sample/SelectUserViewController.h
@@ -31,8 +31,12 @@
  *
  */
 
+#import <Google/SignIn.h>
 #import <UIKit/UIKit.h>
 
-@interface FirstViewController : UIViewController
-
+@interface SelectUserViewController : UIViewController <GIDSignInDelegate, GIDSignInUIDelegate>
+@property(weak, nonatomic) IBOutlet GIDSignInButton *signInButton;
+@property(weak, nonatomic) IBOutlet UIButton *signOutButton;
+@property(weak, nonatomic) IBOutlet UILabel *mainLabel;
+@property(weak, nonatomic) IBOutlet UILabel *subLabel;
 @end
diff --git a/objective-c/auth_sample/FirstViewController.m b/objective-c/auth_sample/SelectUserViewController.m
similarity index 58%
rename from objective-c/auth_sample/FirstViewController.m
rename to objective-c/auth_sample/SelectUserViewController.m
index 1237c42..5e03056 100644
--- a/objective-c/auth_sample/FirstViewController.m
+++ b/objective-c/auth_sample/SelectUserViewController.m
@@ -31,13 +31,46 @@
  *
  */
 
-#import "FirstViewController.h"
+#import "SelectUserViewController.h"
 
-@implementation FirstViewController
+@implementation SelectUserViewController
 
 - (void)viewDidLoad {
   [super viewDidLoad];
-  // Do any additional setup after loading the view, typically from a nib.
+
+  self.signOutButton.layer.cornerRadius = 5;
+  self.signOutButton.hidden = YES;
+
+  // As instructed in https://developers.google.com/identity/sign-in/ios/sign-in
+  GIDSignIn.sharedInstance.delegate = self;
+  GIDSignIn.sharedInstance.uiDelegate = self;
+
+  [GIDSignIn.sharedInstance signInSilently];
+}
+
+- (void)signIn:(GIDSignIn *)signIn
+didSignInForUser:(GIDGoogleUser *)user
+     withError:(NSError *)error {
+  if (error) {
+    // The user probably cancelled the sign-in flow.
+    return;
+  }
+
+  self.mainLabel.text = [NSString stringWithFormat:@"User: %@", user.profile.email];
+  NSString *scopes = [user.accessibleScopes componentsJoinedByString:@", "];
+  scopes = scopes.length ? scopes : @"(none)";
+  self.subLabel.text = [NSString stringWithFormat:@"Scopes: %@", scopes];
+
+  self.signInButton.hidden = YES;
+  self.signOutButton.hidden = NO;
+}
+
+- (IBAction)didTapSignOut {
+  [GIDSignIn.sharedInstance signOut];
+  self.mainLabel.text = @"Please sign in.";
+  self.subLabel.text = @"";
+  self.signInButton.hidden = NO;
+  self.signOutButton.hidden = YES;
 }
 
 @end