ios – 处理多个NSURL连接的最佳方式

我试图以编程方式创建一个xls表.为了填写表格,我在100左右制作了多个NSURLConnection.现在,我的方法是：

>建立连接并将数据存储到数组中.该数组有100个对象.
>现在取第一个对象并调用连接.存储数据.并在数组中与第二个对象建立第二个连接.这将持续到阵列中的最后一个对象.

完成100个连接平均需要14秒.有没有办法实现NSURLConnection以更快的方式获得响应？

直到昨天我遵循的基本方法如下：

声明属性：

@property (nonatomic,strong) NSURLConnection *getReportConnection;
@property (retain,nonatomic) NSMutableData *receivedData;
@property (nonatomic,strong) NSMutableArray *reportArray;

在viewDidLoad中初始化数组：

reportArray=[[NSMutableArray alloc]init];

在按钮操作中初始化NSURLConnection：

/initialize url that is going to be fetched.
NSURL *url = [NSURL URLWithString:[Nsstring stringWithFormat:@"****/%@/crash_reasons",ID]];

//initialize a request from url
NSMutableuRLRequest *request = [NSMutableuRLRequest requestWithURL:url];
[request addValue:tokenReceived forHTTPHeaderField:@"**Token"];

[request setHTTPMethod:@"GET"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

//initialize a connection from request
self.getReportConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

处理收到的数据：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data{
if (connection==_getVersionConnection) {

    [self.receivedData_ver appendData:data];

    Nsstring *responseString = [[Nsstring alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSError *e = nil;
    NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];

    NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:jsonData options: NSJSONReadingMutableContainers error: &e];
    [JSON[@"app_versions"] enumerateObjectsUsingBlock:^(id obj,NSUInteger idx,BOOL *stop) {
        if (![obj[@"id"] isEqual:[NSNull null]] && ![reportArray_ver containsObject:obj[@"id"]]) {

            [reportArray_ver addobject:obj[@"id"]];

        }
        NSLog(@"index = %lu,Object For title Key = %@",(unsigned long)idx,obj[@"id"]);
    }];

    if (JSON!=nil) {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Version Reports succesfully retrieved" message:@"" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
        [alert show];
    }
 }

}

完成后调用另一个连接：

// This method is used to process the data after connection has made successfully.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
   if (connection==getReportConnection) {

             //check and call the connection again
    }
}

今天,我尝试使用sendAsync的NSURLConnection一个接一个地使用循环触发所有连接,并且它工作得很好.

self.receivedData_ver=[[NSMutableData alloc]init];
__block NSInteger outstandingRequests = [reqArray count];
 for (Nsstring *URL in reqArray) {

    NSMutableuRLRequest *request=[NSMutableuRLRequest requestWithURL:[NSURL URLWithString:URL]
                                                         cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                     timeoutInterval:10.0];

    [request setHTTPMethod:@"GET"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];


[NSURLConnection sendAsynchronousRequest:request
                                   queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse *response,NSData *data,NSError *connectionError) {

                           [self.receivedData appendData:data]; //What is the use of appending NSdata into Nsmutable data? 

                           Nsstring *responseString = [[Nsstring alloc] initWithData:data encoding:NSUTF8StringEncoding];

                           NSError *e = nil;
                           NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];

                           NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:jsonData options: NSJSONReadingMutableContainers error: &e];
                           NSLog(@"login json is %@",JSON);

                           [JSON[@"app_versions"] enumerateObjectsUsingBlock:^(id obj,BOOL *stop) {


                               if (![obj[@"id"] isEqual:[NSNull null]] && ![reportArray_ver containsObject:obj[@"id"]]) {

                                   [reportArray_ver addobject:obj[@"id"]];

                               }

                               NSLog(@"index = %lu,obj[@"id"]);
                           }];


                          outstandingRequests--;

                           if (outstandingRequests == 0) {
                               //all req are finished
                               UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Version Reports succesfully retrieved" message:@"" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
                               [alert show];
                           }

                       }];
}

这次花了一半的时间来完成100个请求而不是旧的过程,除了asynReq之外还有更快的方法吗？.使用NSURLconnection和NSURLConnection与asyncReq的最佳方案是什么？

for (Nsstring *URL in URLArray) {
    NSMutableuRLRequest *request = [NSMutableuRLRequest requestWithURL:URL];

    // configure the request here

    // Now issue the request

    NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data,NSURLResponse *response,NSError *error) {
        // check error and/or handle response here
    }];
    [task resume];
}

dispatch_group_t group = dispatch_group_create();

for (Nsstring *URL in URLArray) {
    dispatch_group_enter(group);

    NSMutableuRLRequest *request = [NSMutableuRLRequest requestWithURL:URL];

    // configure the request here

    // Now issue the request

    NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data,NSError *error) {
        // check error and/or handle response here

        // when all done,leave group

        dispatch_group_leave(group);
    }];
    [task resume];
}

dispatch_group_notify(group,dispatch_get_main_queue(),^{
    // do whatever you want when all of the requests are done
});