在iOS中使用SSL连接到Twitter API

我正在尝试使用iOS SDK中的Twitter API获取用户的Twitter时间轴，并显示一条错误消息：

code = 92; message = "SSL is required";

我在错误中进行了搜索，并在Twitter API网站上找到了此页面，但是我不知道如何在iOS中使用它。

这是我的代码：

ACAccountStore *account = [[ACAccountStore alloc] init];

ACAccountType *accountType = [account accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

[account requestAccessToAccountsWithType:accountType options:nil completion:^(BOOL granted, NSError *error)
 {


     if (granted == YES){

         NSArray *arrayOfAccounts = [account accountsWithAccountType:accountType];


         if ([arrayOfAccounts count] > 0) {

             ACAccount *twitterAccount = [arrayOfAccounts lastObject]; 

             NSURL *requestAPI = [NSURL URLWithString:@"http://api.twitter.com/1.1/statuses/user_timeline.json"]; 


             NSMutableDictionary *parameters = [[NSMutableDictionary alloc] init];

             [parameters setObject:@"100" forKey:@"count"];

             [parameters setObject:@"1" forKey:@"include_entities"];



             SLRequest *posts = [SLRequest requestForServiceType:SLServiceTypeTwitter requestMethod:SLRequestMethodGET URL:requestAPI parameters:parameters];

             posts.account = twitterAccount;



             [posts performRequestWithHandler:

              ^(NSData *response, NSHTTPURLResponse
                *urlResponse, NSError *error)
              {
                  // The NSJSONSerialization class is then used to parse the data returned and assign it to our array.

                  array = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];

                  if (array.count != 0) {

                      dispatch_async(dispatch_get_main_queue(), ^{
                          NSLog(@"%@",array);
                      });

                  }

              }];

         }

     } else {

         // Handle failure to get account access
         NSLog(@"%@", [error localizedDescription]);

     }

 }];

有办法解决这个问题吗？