多个接口请求顺序copy

//数据请求

-(void)initData

{

[[LoadingClassshared]showLoading:@"正在加载..."];

//创建信号量

dispatch_semaphore_tsemaphore =dispatch_semaphore_create(0);

//创建全局并行

dispatch_queue_tqueue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);

dispatch_group_tgroup =dispatch_group_create();

dispatch_group_async(group, queue, ^{

//请求一

[selftenderBaseRequest];

dispatch_semaphore_signal(semaphore);

});

dispatch_group_async(group, queue, ^{

//请求二

[selftenderBidRequest];

dispatch_semaphore_signal(semaphore);

});

dispatch_group_async(group, queue, ^{

//请求三

[selftenderInvalidRequest];

dispatch_semaphore_signal(semaphore);

});

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);

});

}

转载：http://blog.sina.com.cn/s/blog_147d0371c0102wi1p.html