Twitter iOS Streaming API：未收到数据

我正在尝试修改Apple使用Twitter API的示例代码，以便我可以使用流API来过滤推文。我正在尝试实施针对此问题建议的方法：

TWRequest 是否适用于 Twitter 流 API？ https://stackoverflow.com/questions/8566742/does-twrequest-work-for-the-twitter-streaming-api

我已按照建议创建了签名的 NSURLRequest 和 NSURLConnection 对象，并设置了连接对象的委托。选择有效的 Twitter 帐户并用于对 URL 进行签名。问题是委托连接：didReceiveData：方法从未被调用。

这是我的代码：

@implementation Twitter

-(id)init{
    if (self=[super init]) {
        NSLog(@"Twitter init");

        // Tell the notification centre to inform the app if the twitter account changes
        [[NSNotificationCenter defaultCenter] addObserver:self 
                                                 selector:@selector(twitterAccountChanged) 
                                                     name:ACAccountStoreDidChangeNotification object:nil];

        // Create an account store object.
        ACAccountStore *accountStore = [[ACAccountStore alloc] init];

        // Create an account type that ensures Twitter accounts are retrieved.
        ACAccountType *accountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];


        // Request access from the user to use their Twitter accounts.
        [accountStore requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) {
            if(granted) {
                NSLog(@"Twitter: Access to twitter accounts granted");

                // Get the list of Twitter accounts.
                NSArray *accountsArray = [accountStore accountsWithAccountType:accountType];

                // Pick the twitter account to use
                if ([accountsArray count] > 0) {

                    // Grab the initial Twitter account to tweet from.
                    ACAccount *twitterAccount = [accountsArray objectAtIndex:0];

                    // This is for a status filter
                    NSURL *url=[NSURL URLWithString:@"https://stream.twitter.com/1/statuses/filter.json"];

                    // Create the parameters dictionary
                    NSDictionary *dictionary=[NSDictionary dictionaryWithObjectsAndKeys:@"twitter", @"track", nil];

                    // Create TWRequest object
                    TWRequest *req=[[TWRequest alloc] initWithURL:url parameters:dictionary requestMethod:TWRequestMethodPOST];

                    // Set the account
                    [req setAccount:twitterAccount];

                    // Get a signed URL request
                    NSURLRequest *signedRequest=[req signedURLRequest];

                    // Initate the connection
                    [NSURLConnection connectionWithRequest:signedRequest delegate:self];

                } else {
                    NSLog(@"Twitter: No twitter accounts to access");
                }

            } else {
                NSLog(@"Twitter: Access to twitter accounts denied");

            }
        }];

        return self;
    }
    return nil;
}

-(void)twitterAccountChanged{
    NSLog(@"Twitter twitterAccountChanged");
}


-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    NSLog(@"data received");
}

程序的输出是：

2012-07-24 09:50:03.668 TwitterAPITest[36722:10403] Twitter init
2012-07-24 09:50:03.836 TwitterAPITest[36722:11d03] Twitter: Access to twitter accounts granted

正如您所看到的，一切似乎都工作正常，唯一的问题是委托方法从未被调用，我目前不知道为什么。

任何帮助将非常感激...

Mike

我花了一些时间来启动并运行它，所以我想我应该为其他人发布我的代码。就我而言，我试图让推文靠近某个位置，所以你会看到我使用了locations参数和我在范围内的位置结构。您可以将所需的任何参数添加到参数字典中。

另请注意，这只是基本内容，您将需要执行一些操作，例如通知用户未找到帐户，并允许用户在存在多个帐户时选择他们想要使用的 Twitter 帐户。

流媒体快乐！

//First, we need to obtain the account instance for the user's Twitter account
ACAccountStore *store = [[ACAccountStore alloc] init];
ACAccountType *twitterAccountType = [store accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

//  Request permission from the user to access the available Twitter accounts
[store requestAccessToAccountsWithType:twitterAccountType
                 withCompletionHandler:^(BOOL granted, NSError *error) {
                     if (!granted) {
                         // The user rejected your request
                         NSLog(@"User rejected access to the account.");
                     }
                     else {
                         // Grab the available accounts
                         NSArray *twitterAccounts = [store accountsWithAccountType:twitterAccountType];
                         if ([twitterAccounts count] > 0) {
                             // Use the first account for simplicity
                             ACAccount *account = [twitterAccounts objectAtIndex:0];
                             NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
                             [params setObject:@"1" forKey:@"include_entities"];
                             [params setObject:location forKey:@"locations"];
                             [params setObject:@"true" forKey:@"stall_warnings"];
                             //set any other criteria to track
                             //params setObject:@"words, to, track" forKey@"track"];

                             //  The endpoint that we wish to call
                             NSURL *url = [NSURL URLWithString:@"https://stream.twitter.com/1.1/statuses/filter.json"];

                             //  Build the request with our parameter
                             TWRequest *request = [[TWRequest alloc] initWithURL:url
                                                                      parameters:params
                                                                   requestMethod:TWRequestMethodPOST];

                             // Attach the account object to this request
                             [request setAccount:account];
                             NSURLRequest *signedReq = request.signedURLRequest;

                             // make the connection, ensuring that it is made on the main runloop
                             self.twitterConnection = [[NSURLConnection alloc] initWithRequest:signedReq delegate:self startImmediately: NO];
                             [self.twitterConnection scheduleInRunLoop:[NSRunLoop mainRunLoop]
                                                   forMode:NSDefaultRunLoopMode];
                             [self.twitterConnection start];

                         } // if ([twitterAccounts count] > 0)
                     } // if (granted) 
                 }];