GCD信号量多组操作
近期在进行产品迭代时遇到了一个问题，就是在一个列表中进行两次请求，但是只有在两个网络请求全部结束后才停止列表刷新。这个需求我们经常遇到。我们可以用线程组或者信号量来处理。我代码中用的是信号量。
但是因为这次的代码使用swift写的，途中遇到了很多问题。毕竟oc和swift写法还是有很大不同。在这里，我把代码附上。
OC版：
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
// 轮播图
[SMDataRequest requestBigHomeScrollImageSuccess:^(SMFirstLayerData *response) {
self.scrollImages = response.data;
SMLog(@"轮播图 ++++%@", [NSThread currentThread]);
dispatch_semaphore_signal(semaphore);
} Failure:^(NSError *error) {
dispatch_semaphore_signal(semaphore);
}];
// 猜你喜欢
[SMDataRequest requestFavoriteProductWithUserId:USER_ID currentPage:1 Success:^(NSDictionary *response) {
dispatch_semaphore_signal(semaphore);
SMLog(@"猜你喜欢 ++++%@", [NSThread currentThread]);
// 数据处理
} Failure:^(NSError *error) {
dispatch_semaphore_signal(semaphore);
}];
dispatch_async(queue, ^{
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
SMLog(@"全部加载好了 ++++%@", [NSThread currentThread]);
[self.bigHomeCollectionView.mj_header endRefreshing];
});
swift版：
let semaphore = DispatchSemaphore.init(value: 0)
let queue = DispatchQueue.global()
GetActivityFriendAllApi(Uid: UserModel.shareInstance.uid ?? 0, Status: 1, PageOn: 1,ApiType:1,pageSize : 100).startWithCompletionBlock(success: { (request:YTKBaseRequest!) in
print("===succ===="+"1"+"======")
semaphore.signal()
}) { (request:YTKBaseRequest!) in
print("===error===="+"1"+"======")
semaphore.signal()
}
GetActivityFriendAllApi(Uid: UserModel.shareInstance.uid ?? 0, Status: 1, PageOn: 1,ApiType:1,pageSize : 100).startWithCompletionBlock(success: { (request:YTKBaseRequest!) in
print("===succ===="+"2"+"======")
semaphore.signal()
}) { (request:YTKBaseRequest!) in
print("===error===="+"2"+"======")
semaphore.signal()
}
queue.async {
// semaphore.wait(timeout: DispatchTime.distantFuture)
// semaphore.wait(timeout: DispatchTime.distantFuture)
semaphore.wait()
semaphore.wait()
print("======="+"123"+"======")
}
