GCD信号量

dispatch_semaphore_create(long value); // 创建信号量 dispatch_semaphore_signal(dispatch_semaphore_t deem); // 发送信号量 dispatch_semaphore_wait(dispatch_semaphore_t dsema, dispatch_time_t timeout); // 等待信号量

MJWeakSelf dispatch_semaphore_t sem = dispatch_semaphore_create(0); dispatch_async(dispatch_get_global_queue(0, 0), ^{

    NSDictionary *dic = @{@"roomId":self.currentRoomId};
    [NetManager getAnchorInfoWithDic:dic handler:^(LKTheHostAnchorInfoModel *model, NSError *error) {
        if ([model.code isEqualToString:@"success"]) {
            weakSelf.anchorInfoModel = model.data;
        }
        dispatch_semaphore_signal(sem);
    }];
});



dispatch_async(dispatch_get_global_queue(0, 0), ^{
    dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
    NSDictionary *dic = @{@"roomId":self.currentRoomId};
    [NetManager getAnchorInfoWithDic:dic handler:^(LKTheHostAnchorInfoModel *model, NSError *error) {
        if ([model.code isEqualToString:@"success"]) {
            weakSelf.anchorInfoModel = model.data;
        }
        dispatch_semaphore_signal(sem);
    }];
    
});


dispatch_async(dispatch_get_global_queue(0, 0), ^{
    dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
    dispatch_async(dispatch_get_main_queue(), ^{

     weakSelf.dataArray = [weakSelf loadLocalData:weakSelf.anchorInfoModel queryAnchor:weakSelf.queryAnchorModel eventList:weakSelf.eventListDataModel.reserveEventList];

     [weakSelf endDataRefresh];

    });
});