iOS Quickstart

Complete the steps described in the rest of this page, and in about five minutes you'll have a simple iOS application that makes requests to the Drive API.

Prerequisites

To run this quickstart, you'll need:

  • Xcode 8.0 or greater.
  • CocoaPods dependency manager.
  • Access to the internet and a web browser.
  • A Google account with Google Drive enabled.

Step 1: Turn on the Drive API

  1. Use this wizard to create a new app or select an existing one.
  2. Enter "com.example.QuickstartApp" into the field iOS Bundle ID and click the Continue button.
  3. Click the Google Sign-In icon and then click the Enable Google Sign-in button. Click the Continue button.
  4. Click the Download GoogleService-Info.plist button to download the configuration file. Take note of where you saved it. Click the Enable the Drive API button.
  5. Use the dropdown menu to select the same project you use in the previous wizard and click the Continue button.
  6. Close the wizard.

Step 2: Prepare the workspace

  1. Open Xcode and create a new project:
    1. Click File > New > Project, select the iOS > Application > Single View Application template, and click Next.
    2. Set the Product Name to "QuickstartApp", Organization Identifier to "com.example", and Language to Objective-C. Click Next.
    3. Select a destination directory for the project and click Create.
  2. Close the project by clicking File > Close Project.
  3. Open a Terminal window and navigate to the directory that contains the QuickstartApp.xcodeproj file you just created.
  4. Run the following commands to create the Podfile, install the library, and open the resulting XCode project:

    cat << EOF > Podfile &&
    platform :ios, '8.0'
    target 'QuickstartApp' do
        pod 'GoogleAPIClientForREST/Drive', '~> 1.2.1'
        pod 'Google/SignIn', '~> 3.0.3'
    end
    EOF
    pod install &&
    open QuickstartApp.xcworkspace
    

  5. In the XCode Project Navigator select the project node "QuickstartApp" and click the menu item File > Add files to "QuickstartApp".

  6. Locate the GoogleService-Info.plist file downloaded earlier and select it. Click the Options button and ensure that Copy items if needed and all the targets are checked. Click the Add button.
  7. With the project node still selected, select "QuickstartApp" in the TARGETS section, then select the Info tab, and expand the URL Types section.
  8. Click the + button, and add a URL scheme for your reversed client ID. To find this value, open the GoogleService-Info.plist configuration file, and look for the REVERSED_CLIENT_ID key. Copy the value of that key, and paste it into the URL Schemes box on the configuration page. Leave the other fields blank.
  9. Rebuild the project by clicking Product > Clean Build Folder (while holding the option key) and Product > Build.

Step 3: Set up the sample

Replace the contents of the following files with the code provided:

AppDelegate.h
#import <UIKit/UIKit.h>
#import <Google/SignIn.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;


@end
AppDelegate.m
#import "AppDelegate.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    NSError* configureError;
    [[GGLContext sharedInstance] configureWithError: &configureError];
    NSAssert(!configureError, @"Error configuring Google services: %@", configureError);

    return YES;
}

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation {
    return [[GIDSignIn sharedInstance] handleURL:url
                               sourceApplication:sourceApplication
                                      annotation:annotation];
}


@end
ViewController.h
#import <UIKit/UIKit.h>
#import <Google/SignIn.h>
#import <GTLRDrive.h>

@interface ViewController : UIViewController <GIDSignInDelegate, GIDSignInUIDelegate>

@property (nonatomic, strong) IBOutlet GIDSignInButton *signInButton;
@property (nonatomic, strong) UITextView *output;
@property (nonatomic, strong) GTLRDriveService *service;


@end
ViewController.m
#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Configure Google Sign-in.
    GIDSignIn* signIn = [GIDSignIn sharedInstance];
    signIn.delegate = self;
    signIn.uiDelegate = self;
    signIn.scopes = [NSArray arrayWithObjects:kGTLRAuthScopeDriveReadonly, nil];
    [signIn signInSilently];

    // Add the sign-in button.
    self.signInButton = [[GIDSignInButton alloc] init];
    [self.view addSubview:self.signInButton];

    // Create a UITextView to display output.
    self.output = [[UITextView alloc] initWithFrame:self.view.bounds];
    self.output.editable = false;
    self.output.contentInset = UIEdgeInsetsMake(20.0, 0.0, 20.0, 0.0);
    self.output.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    self.output.hidden = true;
    [self.view addSubview:self.output];

    // Initialize the service object.
    self.service = [[GTLRDriveService alloc] init];
}

- (void)signIn:(GIDSignIn *)signIn
didSignInForUser:(GIDGoogleUser *)user
     withError:(NSError *)error {
    if (error != nil) {
        [self showAlert:@"Authentication Error" message:error.localizedDescription];
        self.service.authorizer = nil;
    } else {
        self.signInButton.hidden = true;
        self.output.hidden = false;
        self.service.authorizer = user.authentication.fetcherAuthorizer;
        [self listFiles];
    }
}

// List up to 10 files in Drive
- (void)listFiles {
    GTLRDriveQuery_FilesList *query = [GTLRDriveQuery_FilesList query];
    query.fields = @"nextPageToken, files(id, name)";
    query.pageSize = 10;

    [self.service executeQuery:query
                      delegate:self
             didFinishSelector:@selector(displayResultWithTicket:finishedWithObject:error:)];
}

// Process the response and display output
- (void)displayResultWithTicket:(GTLRServiceTicket *)ticket
             finishedWithObject:(GTLRDrive_FileList *)result
                          error:(NSError *)error {
    if (error == nil) {
        NSMutableString *output = [[NSMutableString alloc] init];
        if (result.files.count > 0) {
            [output appendString:@"Files:\n"];
            int count = 1;
            for (GTLRDrive_File *file in result.files) {
                [output appendFormat:@"%@ (%@)\n", file.name, file.identifier];
                count++;
            }
        } else {
            [output appendString:@"No files found."];
        }
        self.output.text = output;
    } else {
        NSMutableString *message = [[NSMutableString alloc] init];
        [message appendFormat:@"Error getting presentation data: %@\n", error.localizedDescription];
        [self showAlert:@"Error" message:message];
    }
}


// Helper for showing an alert
- (void)showAlert:(NSString *)title message:(NSString *)message {
    UIAlertController *alert =
    [UIAlertController alertControllerWithTitle:title
                                        message:message
                                 preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *ok =
    [UIAlertAction actionWithTitle:@"OK"
                             style:UIAlertActionStyleDefault
                           handler:^(UIAlertAction * action)
     {
         [alert dismissViewControllerAnimated:YES completion:nil];
     }];
    [alert addAction:ok];
    [self presentViewController:alert animated:YES completion:nil];
}


@end

Step 4: Run the sample

Switch to the scheme QuickstartApp and run the sample (Cmd+R) using the device simulator or a configured device. The first time you run the sample, it will prompt you to log in to your Google account and authorize access.

Notes

  • Authorization information is stored in your Keychain, so subsequent executions will not prompt for authorization.

Further reading

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