iOS开发网络篇:GCD实战之多个网络请求的并发

GCD实战之多个网络请求的并发

第一种GCD 方式:

    // 创建信号量
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
    // 创建全局并行
    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, ^{

        // 请求一
        [loginCode getUserInfoWithNick:nil andUserId:kUserId onSuc:^(id data) {
            NSLog(@"yue");
            dispatch_semaphore_signal(semaphore);

        } andFail:^(NSError *error) {       
        }];

    });
    dispatch_group_async(group, queue, ^{

        // 请求二
        [CommodityViewModel getPriceTransformForIntegral:nil onSuccess:^(id data) {

            NSLog(@"duihuan11");
            dispatch_semaphore_signal(semaphore);

        } onFailure:^(NSError *error) {
        }];
    });
    dispatch_group_async(group, queue, ^{

        // 请求三
        [CommodityViewModel getPriceTransformForIntegral:nil onSuccess:^(id data) {
            NSLog(@"duihuan22");
            dispatch_semaphore_signal(semaphore);

        } onFailure:^(NSError *error) {            
        }];
    });

    dispatch_group_notify(group, queue, ^{

        // 三个请求对应三次信号等待
        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);

        //在这里 进行请求后的方法,回到主线程
        dispatch_async(dispatch_get_main_queue(), ^{

            //更新UI操作

        });


    });

第二种 通过请求数量计数

定义一个block

typedef void(^Complete)();

将block作为类的属性

@property (copy, nonatomic) Complete complete;

实现方式:

NSInteger requestCount = 0;

    //第一个网络请求
    [CommodityViewModel getPriceTransformForIntegral:nil onSuccess:^(id data) {
        NSLog(@"duihuan11");
        requestCount++;
        if (self.complete) {
            self.complete();
        }
    } onFailure:^(NSError *error) {
    }];

    //第二个网络请求
    [CommodityViewModel getPriceTransformForIntegral:nil onSuccess:^(id data) {
        NSLog(@"duihuan22");
        requestCount++;
        if (self.complete) {
            self.complete();
        }
    } onFailure:^(NSError *error) {
    }];

    //第三个网络请求
    [CommodityViewModel getPriceTransformForIntegral:nil onSuccess:^(id data) {
        NSLog(@"duihuan33");
        requestCount++;
        if (self.complete) {
            self.complete();
        }
    } onFailure:^(NSError *error) {
    }];

    self.complete = ^{

            //请求网络的数量等于3表示三个网络请求已完成
            if (requestCount == 3) {

                //在这里 进行请求后的方法,回到主线程
                dispatch_async(dispatch_get_main_queue(), ^{

                    //更新UI操作

                });

            }

        };

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