GCD 中组队列group与Afnetworking的结合使用

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学了GCD以后，对所讲解的概念都有所了解了，但是对于group创建组队列，在组队列中是正确的使用AFnetworking发送网络请求。
下面分别来说一下吧。
1，我们使用 dispatch_group_enter(group);dispatch_group_leave(group);来解决
第一种情况，对某一个url多次请求的情况，

 dispatch_group_t group = dispatch_group_create();    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];    //Enter group    for (int i =0; i<3; i++) {        dispatch_group_enter(group);        [manager GET:@"http://www.qq.com" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {            //Deal with result...            //Leave group            NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   腾讯成功   %d ＊＊＊＊＊＊＊＊＊＊＊\n",i);            dispatch_group_leave(group);        }failure:^(AFHTTPRequestOperation *operation, NSError *error) {            //Deal with error...            //Leave group            NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   腾讯失败   %d ＊＊＊＊＊＊＊＊＊＊＊\n",i);            dispatch_group_leave(group);        }];        //More request...    }    dispatch_group_notify(group, dispatch_get_main_queue(), ^(){        NSLog(@"<><><><><><><><>   end   <><><><><><><><><><><><><><><><>");    });

以前自己使用的时候都是单独创建一个global线程，在每个线程任务中加入网络请求，现在这样子写的话，减少了一层嵌套。

如果不是对某一个url多次请求的话，那么就需要

 dispatch_group_t group = dispatch_group_create();    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];    //Enter group    dispatch_group_enter(group);    [manager GET:@"https://www.baidu.com" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {            //Deal with result...            //Leave group        NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   百度成功   ＊＊＊＊＊＊＊＊＊＊＊\n");            dispatch_group_leave(group);    }failure:^(AFHTTPRequestOperation *operation, NSError *error) {           //Deal with error...            //Leave group        NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   百度失败   ＊＊＊＊＊＊＊＊＊＊＊\n");            dispatch_group_leave(group);    }];    //More request...    dispatch_group_enter(group);    [manager GET:@"https://www.163.com" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {        //Deal with result...        //Leave group        NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   网易成功   ＊＊＊＊＊＊＊＊＊＊＊\n");        dispatch_group_leave(group);    }failure:^(AFHTTPRequestOperation *operation, NSError *error) {        //Deal with error...        //Leave group        NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   网易失败   ＊＊＊＊＊＊＊＊＊＊＊\n");        dispatch_group_leave(group);    }];    dispatch_group_enter(group);    [manager GET:@"http://www.qq.com" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {        //Deal with result...        //Leave group        NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   腾讯成功   ＊＊＊＊＊＊＊＊＊＊＊\n");        dispatch_group_leave(group);    }failure:^(AFHTTPRequestOperation *operation, NSError *error) {        //Deal with error...        //Leave group        NSLog(@"＊＊＊＊＊＊＊＊＊＊＊   腾讯失败   ＊＊＊＊＊＊＊＊＊＊＊\n");        dispatch_group_leave(group);    }];    dispatch_group_notify(group, dispatch_get_main_queue(), ^(){        NSLog(@"<><><><><><><><>   end   <><><><><><><><><><><><><><><><>");    });

2，我们使用GCD中的信号量来解决：
代码如下：

BaiduWeatherForCityDailyModel * model = [[BaiduWeatherForCityDailyModel alloc] init];    //创建信号量    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);    dispatch_group_t group = dispatch_group_create();    dispatch_group_async(group, queue, ^{        [RequestManager getRecentlyThreeDaysWeather:@{@"location":location, @"language":@"zh-Hans", @"unit":@"c", @"start":@"0", @"days":@"3"} callBack:^(id data) {            if (data) {                NSArray* dataArray = (NSArray*)data;                model.dailyModelArray = [dataArray mutableCopy];            }            dispatch_semaphore_signal(semaphore);        }];    });    dispatch_group_async(group, queue, ^{        [RequestManager getWeatherLive:@{@"location":location, @"language":@"zh-Hans", @"unit":@"c"} callBack:^(id data) {            if (data) {                NSArray* dataArray = (NSArray*)data;                model.temperature = [dataArray firstObject];                model.last_update = dataArray[1];                model.weatherStatus = [dataArray lastObject];            }            dispatch_semaphore_signal(semaphore);        }];    });    dispatch_group_notify(group, queue, ^{        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);        callback(model);    });

另外，关于AFnetworking内部的封装，我还要继续的去看，如果有所感悟，我会及时的分享给大家的。

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