ios - 如何发送异步 http post - ios

Question

我的应用程序有点问题。我想向服务器异步发送一些 http 请求。我创建了这个方法:

- (void)sendHTTPRequest:(NSString *)urlString type:(NSString *)type idNegozio:(NSNumber *)idNegozio {

    self.negozi = [[NSMutableArray alloc] init];
    NSData *jsonData;
    NSString *jsonString;

    if ([type isEqualToString:@"shops"]) {

        self.reqNeg = YES;
        self.reqApp = NO;

...

    jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:nil];
    jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];



    else if ([type isEqualToString:@"appointments"])
    {
        [self.loadingIconApp startAnimating];

        self.reqNeg = NO;
        self.reqApp = YES;

...

            jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:nil];
            jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];

    NSString *requestString = [NSString stringWithFormat:urlString];
        NSURL *url = [NSURL URLWithString:requestString];
    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30];
    [urlRequest setHTTPMethod:@"POST"];
    [urlRequest setHTTPBody: jsonData];

    NSURLConnection * conn = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];

    [conn start];

我使用这种方法进行连接:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    self.responseData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.responseData appendData:data];
}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
                  willCacheResponse:(NSCachedURLResponse*)cachedResponse {
    return nil;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    if (self.reqNeg == YES) {
        //here use the responseData for my first http request
    }

    if (self.reqApp == YES) {

        //here use the responseData for second http request
    }


}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

}

但以这种方式只有第一个连接有效，我可以使用 responseData。同时，如果我尝试发送其他 http 请求，方法 connectionDidFinishLoading 不起作用，其他方法也不起作用。有人有想法吗？？

Answer 1

如果你想一个一个地使用异步请求，你可以这样做:

- (void)request1 {
  NSString *requestString = @"your url here";
  NSOperationQueue *queue = [[NSOperationQueue alloc] init];
  [NSURLConnection sendAsynchronousRequest:[[NSURLRequest alloc]initWithURL:[NSURL URLWithString: requestString]]
                                     queue:queue
                         completionHandler:
   ^(NSURLResponse *response, NSData *data, NSError *error) {
     NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
     if (!error && httpResponse.statusCode >= 200 && httpResponse.statusCode <300) {
        // call the request2 here which is similar to request 1
        // your request2 method here
    }
  }];
}

希望对你有帮助~谢谢~