Objective-C中有多个NSURLConnection委托 [英] Multiple NSURLConnection delegates in Objective-C

问题描述

我有两个NSURLConnections。第二个依赖于第一个的内容，所以处理从连接接收的数据将对于两个连接不同。

I have two NSURLConnections. The second one depends on the content of the first, so handling the data received from the connection will be different for the two connections.

我只是选择了Objective-C，我想知道实现代理的正确方法是什么。

I'm just picking up Objective-C and I would like to know what the proper way to implement the delegates is.

现在我正在使用：

NSURL *url=[NSURL URLWithString:feedURL];
NSURLRequest *urlR=[[[NSURLRequest alloc] initWithURL:url] autorelease];
NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:urlR delegate:self];

我不想使用self作为委托，我如何使用不同的委托定义两个连接？

I don't want to use self as the delegate, how do I define two connections with different delegates?

NSURLConnection *c1 = [[NSURLConnection alloc] initWithRequest:url delegate:handle1];
NSURLConnection *c2 = [[NSURLConnection alloc] initWithRequest:url delegate:handle2];

如何创建handle1和handle2作为实现？还是接口？我真的不知道你会怎么做。

How would do i create handle1 and handle2 as implementations? Or interfaces? I don't really get how you would do this.

任何帮助都是真棒。

谢谢，
Brian Gianforcaro

Thanks, Brian Gianforcaro

推荐答案

在您的示例中，您将分配一个DownloadDelegate对象，而不必初始化它。

In your sample, you alloc a DownloadDelegate object without ever init'ing it.

    DownloadDelegate *dd = [DownloadDelegate alloc];

这很危险。而是：

    DownloadDelegate *dd = [[DownloadDelegate alloc] init];

此外，并非严格响应方法在你的@interface声明（当然不会伤害，）。最后，你需要确保你实现连接：didFailWithError：和connectionDidFinishLoading：to-release你的DownloadDelegate对象，否则你会泄露。

Also, it's not strictly necessary to declare your delegate response methods in your @interface declaration (though it won't hurt, of course). Finally, you'll want to make sure that you implement connection:didFailWithError: and connectionDidFinishLoading: to -release your DownloadDelegate object, otherwise you'll leak.

重新启动并运行！

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