Objective-C - 将数据从NSObject子类发送到UIViewController [英] Objective-C – Sending data from NSObject subclass to an UIViewController

问题描述

我有一个 UIViewController 里面有一个 UITableView 。在这个视图控制器中，我想显示一些我从互联网上下载的数据。所以为此，我创建了一个名为 OfficesParser 的辅助类，它应该执行以下操作：

I have an UIViewController which has a UITableView inside. In this view controller I want to display some data that I have downloaded from the internet. So for this I have created a helper class called OfficesParser which is supposed to do the following:

1. 使用从网上下载数据ASIHTTPRequest


2. 使用JSON解析器处理数据


3. 完成后，将数据发送回我的视图控制器

在我的视图控制器中我是在 -viewDidLoad 中分配 ing和 init 我的助手类，如下所示：

In my view controller I'm allocing and initing my helper class in -viewDidLoad like so:

self.officesParser = [[[OfficesParser alloc] init] autorelease]; //officesParser is a retained property

然后在 -viewWillAppear：我为将启动下载过程的officesParser对象调用方法如下：

Then in -viewWillAppear: I call the the method for the officesParser object that will start the download process like so:

[self.officesParser download];

在我的助手班级 OfficesParser ASIHTTPRequest 有一个委托方法，可以告诉您队列何时完成下载。所以从这个方法我想将数据发送到我的视图控制器。我认为这会有效，但它没有：

In my helper class OfficesParser ASIHTTPRequest has a delegate method that tells you when a queue has finished downloading. So from this method I want send the data to my view controller. I would think this would work, but it didn't:

- (void)queueFinished:(ASINetworkQueue *)queue {

    NSArray *offices = [self offices];
    OfficesViewController *ovc = [[OfficesViewController alloc] init];
    [ovc setOffices:offices];

}

考虑到这些代码，你将如何实现我的目标我试图用正确的代码吗？

With this code in mind, how would you achieve what I'm trying to do with proper code?

推荐答案

你需要看一下代表和协议。它们正是您正在寻找的，因为它们让课程无需持久引用即可进行通信。 此处是对他们的另一种解释。

You need to take a look at delegates and protocols. They're exactly what you're looking for, as they let classes communicate without having to persist a reference. Here is another explanation on them.

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