Objective c iOS谷歌硬盘集成

我想在我的iOS应用程序中与Google Drive集成

我已经完成了授权的代码，我正在取回accessToken，所以我想知道——从Google Drive检索PDF文件的方向

我的登录码：

- (IBAction)signInButtonTapped:(id)sender {    
    NSURL *issuer = [NSURL URLWithString:kIssuer];
    NSURL *redirectURI = [NSURL URLWithString:kRedirectURI];

    [self logMessage:@"Fetching configuration for issuer: %@", issuer];
    // discovers endpoints

    [OIDAuthorizationService discoverServiceConfigurationForIssuer:issuer
                                                        completion:^(OIDServiceConfiguration *_Nullable configuration, NSError *_Nullable error) {


               if (!configuration) {
                    [self logMessage:@"Error retrieving discovery document: %@", [error localizedDescription]];
                    [self setAuthState:nil];
                    return;
                }

                [self logMessage:@"Got configuration: %@", configuration];

                                                        // builds authentication request
                OIDAuthorizationRequest *request =
                [[OIDAuthorizationRequest alloc] initWithConfiguration:configuration
                                                                                                      clientId:kClientID
                                                                                                        scopes:@[OIDScopeOpenID, OIDScopeProfile]
                                                                                                   redirectURL:redirectURI
                                                                                                  responseType:OIDResponseTypeCode
                                                                                          additionalParameters:nil];
                                                        // performs authentication request
            AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
            [self logMessage:@"Initiating authorization request with scope: %@", request.scope];

            appDelegate.currentAuthorizationFlow =
            [OIDAuthState authStateByPresentingAuthorizationRequest:request
                                                    presentingViewController:self
                                                                            callback:^(OIDAuthState *_Nullable authState,
                                                                                                                  NSError *_Nullable error) {
                                        if (authState) {

                                            [self setAuthState:authState];

                                            [self logMessage:@"Got authorization tokens. Access token: %@", authState.lastTokenResponse.accessToken];
                                            [self logMessage:@"Got authorization tokens. Refresh Access token %@", authState.refreshToken];



                                            } else {

                                            [self logMessage:@"Authorization error: %@", [error localizedDescription]];

                                            [self setAuthState:nil];

                                        }
            }];}];}

代码参考库：

用于执行Google驱动器服务请求的方法

- (GTLRDriveService *)driveService {
    static GTLRDriveService *service;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    service = [[GTLRDriveService alloc] init];

    // Turn on the library's shouldFetchNextPages feature to ensure that all items
    // are fetched.  This applies to queries which return an object derived from
    // GTLRCollectionObject.
    service.shouldFetchNextPages = YES;

    // Have the service object set tickets to retry temporary error conditions
    // automatically
    service.retryEnabled = YES;
    });
    return service;
}

谷歌认证后，使用以下线路授权driveService：

就你而言

if (authState) {
    // Creates a GTMAppAuthFetcherAuthorization object for authorizing requests.
                GTMAppAuthFetcherAuthorization *gtmAuthorization =
                [[GTMAppAuthFetcherAuthorization alloc] initWithAuthState:authState];

                // Sets the authorizer on the GTLRYouTubeService object so API calls will be authenticated.
                strongSelf.driveService.authorizer = gtmAuthorization;

                // Serializes authorization to keychain in GTMAppAuth format.
                [GTMAppAuthFetcherAuthorization saveAuthorization:gtmAuthorization
                                                toKeychainForName:kKeychainItemName];

    // Your further code goes here
    //
    [self fetchFileList];
}

然后，您可以使用以下方法从Google Drive获取文件：

- (void)fetchFileList {

  __block GTLRDrive_FileList *fileListNew = nil;

  GTLRDriveService *service = self.driveService;

  GTLRDriveQuery_FilesList *query = [GTLRDriveQuery_FilesList query];

  // Because GTLRDrive_FileList is derived from GTLCollectionObject and the service
  // property shouldFetchNextPages is enabled, this may do multiple fetches to
  // retrieve all items in the file list.

  // Google APIs typically allow the fields returned to be limited by the "fields" property.
  // The Drive API uses the "fields" property differently by not sending most of the requested
  // resource's fields unless they are explicitly specified.
  query.fields = @"kind,nextPageToken,files(mimeType,id,kind,name,webViewLink,thumbnailLink,trashed)";

  GTLRServiceTicket *fileListTicket;

  fileListTicket = [service executeQuery:query
                    completionHandler:^(GTLRServiceTicket *callbackTicket,
                                        GTLRDrive_FileList *fileList,
                                        NSError *callbackError) {
    // Callback
    fileListNew = fileList;

  }];
}

尝试参考库中的DriveSample，在项目中包含GTLRDrive文件，就可以使用上述方法了

要使GTMAppAuthFetcherAuthorization正常工作，您必须在项目中包含pod“GTMAppAuth”或手动包含文件

---

实际上，上述方法是从引用库的DriveSample示例复制而来的，该示例对于驱动器请求来说运行良好。

您可能需要检查。给出的示例演示了如何使用客户端库下载PDF格式的Google文档。您还可以查看支持的导出MIME类型表，以获得每个Google文档格式的相应MIME类型。有关更详细的信息，您可能需要检查@Sipho Koza，需要将哪个url设置为重定向URI？我被困在这里了，它也需要添加到开发者控制台吗？请帮忙。我已经写了一个有步骤解释的中型博客。看看这个谢谢你的回复。这对我来说非常好。@GauravSingla你知道如何获取特定文件夹的id吗？如何将图像上传到硬盘？

- (GTLRDriveService *)driveService {
    static GTLRDriveService *service;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    service = [[GTLRDriveService alloc] init];

    // Turn on the library's shouldFetchNextPages feature to ensure that all items
    // are fetched.  This applies to queries which return an object derived from
    // GTLRCollectionObject.
    service.shouldFetchNextPages = YES;

    // Have the service object set tickets to retry temporary error conditions
    // automatically
    service.retryEnabled = YES;
    });
    return service;
}