iOS AFNetwork 3.0：是否有一种发送多个API请求并等待所有请求完成的更快方法？ [英] iOS AFNetwork 3.0: Is there a faster way to send multiple API requests and wait until all of it is finished?

问题描述

我当前正在使用以下方法发送 GET API请求。此方法有效，但我想知道是否有更快的方法。关于需求，我需要知道的是何时已同步所有已删除邮件。

I am currently using the following method to send GET API requests. This method works, but I was wondering if there is a faster way. All I need regarding requirements is to know when all of the Deleted mail has been synced. Any tips or suggestions are appreciated.

- (void)syncDeletedMail:(NSArray *)array atIdx:(NSInteger)idx {
    if (idx < array.count) {
        NSInteger idNumber = array[idx];

        [apiClient deleteMail:idNumber onSuccess:^(id result) {
            [self syncDeletedMail:array atIdx:(idx + 1)];
        } onFailure:^(NSError *error){
            [self syncDeletedMail:array atIdx:(idx + 1)];
        }];
    } else {
       NSLog(@"finished");
    }
}

编辑：我不在乎它是什么顺序只要所有API请求都返回完成，就可以完成（不确定速度是否重要）。

I don't care what order it is completed (not sure if it matters in terms of speed), as long as all the API requests come back completed.

推荐答案

您可以立即发送 deleteMail 请求，并使用 dispatch_group 知道所有请求何时完成。下面是实现，

You can just send deleteMail requests at once and use dispatch_group to know when all the requests are finished. Below is the implementation,

- (void)syncDeletedMail:(NSArray *)array {

    dispatch_group_t serviceGroup = dispatch_group_create();

    for (NSInteger* idNumber in array)
    {
        dispatch_group_enter(serviceGroup);
        [apiClient deleteMail:idNumber onSuccess:^(id result) {
            dispatch_group_leave(serviceGroup);
        } onFailure:^(NSError *error){
            dispatch_group_leave(serviceGroup);
        }];
    }

    dispatch_group_notify(serviceGroup,dispatch_get_main_queue(),^{
       NSLog(@"All email are deleted!"); 
    });
}

在这里您可以看到所有请求同时被触发，因此将时间从 n 倍减少到 1 。

Here you can see all the requests are fired at the same time so it will reduce the time from n folds to 1.

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