iOS：通过分页获取 Facebook 好友答案

【问题标题】：iOS: Fetch Facebook friends with paginationiOS：通过分页获取 Facebook 好友
【发布时间】：2016-06-08 04:53:06
【问题描述】：

我正在尝试从 Facebook 获取“facebook 朋友”列表，其中可能有 500 多个朋友，因此 Facebook 对结果进行了分页。方法如下。

- (void)getFaceBookFriends
{
if ([FBSDKAccessToken currentAccessToken])
{


    [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me/friends" parameters:@{@"fields" : @"first_name, last_name,email,name,gender,id,picture"}]
     startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
         if (!error) {
             NSLog(@"%@",result);
             NSArray *arrData = [result valueForKey:@"data"];
             for (NSDictionary *dictItem in arrData) {
                 [array addObject:dictItem];
             }

             [tableView reloadData];
         }
         else
         {
         }
     }];
}
else
    [self checkFacebookSetup];
}

- (void)checkFacebookSetup
{

[self startLoadingActivity];
self.loginButton.publishPermissions = @[@"basic_info", @"email", @"user_friends"];
self.loginButton.delegate =self;
FBSDKLoginManager *loginManager = [[FBSDKLoginManager alloc] init];
loginManager.loginBehavior = FBSDKLoginBehaviorSystemAccount;
/*Editted*/
[loginManager logInWithReadPermissions:@[@"email"] fromViewController:(UIViewController *)self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
    if (error) {
        // Process error
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Access denied", nil) message:NSLocalizedString(@"You are not given access to your profile. enable it in settings", nil) delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",nil) otherButtonTitles:nil, nil];
        [alert show];
        [self stopLoadingActivity];
    } else if (result.isCancelled) {
        // Handle cancellations
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Access denied", nil) message:NSLocalizedString(@"You are not given access to your profile. enable it in settings", nil) delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",nil) otherButtonTitles:nil, nil];
        [alert show];
        [self stopLoadingActivity];
    } else {
        // If you ask for multiple permissions at once, you
        // should check if specific permissions missing
        if ([result.grantedPermissions containsObject:@"email"])
        {
            // Do work
            if ([FBSDKAccessToken currentAccessToken])
            {
                [self getFaceBookFriends];
            }
        }
    }
}];


}

【问题讨论】：

标签： ios iphone facebook

【解决方案1】：

如果您检查Facebook Developer guide，您需要发送限制param，请求如下：

[[[FBSDKGraphRequest alloc] initWithGraphPath:@"me/friends?limit=25" parameters:@{@"fields" : @"first_name, last_name,email,name,gender,id,picture"}]

你会得到类似下面的响应，所以你需要保存下一个分页光标并像传递它一样

{
  "data": [
     ... Endpoint data is here
  ],
  "paging": {
    "cursors": {
      "after": "MTAxNTExOTQ1MjAwNzI5NDE=",
      "before": "NDMyNzQyODI3OTQw"
    },
    "previous": "https://graph.facebook.com/me/friends?limit=25&before=NDMyNzQyODI3OTQw"
    "next": "https://graph.facebook.com/me/friends?limit=25&after=MTAxNTExOTQ1MjAwNzI5NDE="
  }
}

之后，您需要将 after 值保存在变量中，然后使用以下代码再次调用 api 以获取接下来的 25 个数据：

  [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me/friends?limit=25&after=variableThatStoredAftervalue(MTAxNTExOTQ1MjAwNzI5NDE=)" parameters:@{@"fields" : @"first_name, last_name,email,name,gender,id,picture"}]

更新

如果以上限制不起作用，请尝试以下代码检查facebook SDK class：

 NSDictionary *parameters = @{
                                 @"fields": @"name",
                                 @"limit" : @"50"
                                 };
    // This will only return the list of friends who have this app installed
    FBSDKGraphRequest *friendsRequest = [[FBSDKGraphRequest alloc] initWithGraphPath:@"me/friends"
                                                                          parameters:parameters];

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