Question

当用户在我的应用程序中通过Facebook登录时，我查询他们的图片和他们的名字，并使用该信息填充Core Data和我的Parse.com后端。但是，它不起作用。这是完成所有事情的代码：

#pragma mark - ()

- (IBAction)authButtonAction:(id)sender {
    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];

    // If the person is authenticated, log out when the button is clicked.
    // If the person is not authenticated, log in when the button is clicked.
    if (FBSession.activeSession.isOpen) {
        [appDelegate closeSession];
    } else {
        // The person has initiated a login, so call the openSession method
        // and show the login UX if necessary.
        [appDelegate openSessionWithAllowLoginUI:YES];
        self.authButton.hidden = YES;
    }
}

- (IBAction)toQuadAction:(id)sender {

    // Query to fetch the users name and picture
    NSString *query = @"SELECT name, username FROM user WHERE uid=me() ";

    // Set up the query parameter
    NSDictionary *queryParam = [NSDictionary dictionaryWithObjectsAndKeys:query, @"q", nil];
    // Make the API request that uses FQL
    [FBRequestConnection startWithGraphPath:@"/fql" parameters:queryParam HTTPMethod:@"GET"
                      completionHandler:^(FBRequestConnection *connection,
                                          id result,
                                          NSError *error) {
                          if (error) {
                              NSLog(@"Error: %@", [error localizedDescription]);
                          } else {
                              NSLog(@"My name: %@", result[@"data"][0][@"name"]);
                              NSLog(@"My username: %@", result[@"data"][0][@"username"]);

                              //SAVE TO CORE DATA
                              AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
                              NSEntityDescription *user = [NSEntityDescription entityForName:@"User" inManagedObjectContext:appDelegate.managedObjectContext];
                              NSFetchRequest *getName = [[NSFetchRequest alloc] init];
                              [getName setReturnsObjectsAsFaults:NO];
                              [getName setEntity:user];
                              NSError *error;
                              NSMutableArray *currentUser = [[appDelegate.managedObjectContext executeFetchRequest:getName error:&error] mutableCopy];

                              //SAVE THE NAME TO CORE DATA
                              [currentUser[0] setName:result[@"data"][0][@"name"]];

                              //SAVE NAME AND PICTURE TO PARSE
                              PFQuery *query = [PFQuery queryWithClassName:@"Student"];
                              [query whereKey:@"email" equalTo:[currentUser[0] valueForKey:@"email"]];
                              [query getFirstObjectInBackgroundWithBlock:^(PFObject *users, NSError *error) {
                                  if (!users){
                                      NSLog(@"The first object request failed");
                                  } else{
                                      NSLog(@"grabbed the object");
                                      //SET THE NAME IN PARSE
                                      [users setObject:result[@"data"][0][@"name"] forKey:@"name"];
                                      //SET THE IMAGE IN PARSE
                                      NSString *URLString = [NSString stringWithFormat:@"https://graph.facebook.com/%@/picture?width=235&height=385", result[@"data"][0][@"username"]];
                                      NSURL *picURL = [NSURL URLWithString:URLString];
                                      NSData *picData = [NSData dataWithContentsOfURL:picURL];
                                      PFFile *picture = [PFFile fileWithData:picData ];
                                      [users setObject:picture forKey:@"picture"];
                                      [users saveInBackground];
                                  }
                              }];
                          }
                          [self performSegueWithIdentifier:@"facebookToQuad" sender:sender];
                      }];
    }

所以，有一个auth按钮。用户单击该按钮并使用Facebook登录。然后出现另一个按钮，允许他们进入app。当他们点击它时，我们查询他们的Facebook个人资料的图片和名称，并添加核心数据，然后解析。但是，现在，这些存储系统都没有被填充。

Answer 1

使用更多空格，并声明更多实例变量。打开你的代码，这样你就可以更轻松地找到问题。

例如，拉出值 result[@"data"][0][@"name"] 并将其分配给它自己的局部变量。

在CoreData中对您的实体进行子类化，因此使用setter和getter管理属性赋值更容易。

然后设置断点并检查代码的每一步。

Facebook信息没有填充Parse数据库

1 个答案: