如何识别多个NSURLConnection完成加载？ [英] How to identify WHICH NSURLConnection did finish loading when there are multiple ones?

问题描述

启动多个NSURLConnections（在单个UIViewController中）以收集不同类型的数据。当他们返回（-connectionDidFinishLoading）时，我想对数据进行处理，具体取决于已到达的数据类型。但有一个问题，我怎么知道NSURLConnection返回了什么？我需要知道，所以我可以针对所提供的数据类型采取行动。 （例如，如果是推特xml数据，则显示推特更新）（例如，如果是照片则显示图像）

Multiple NSURLConnections being started (in a single UIViewController) to gather different kinds of data. When they return (-connectionDidFinishLoading) I wanna do stuff with the data, depending on the type of data that has arrived. But one prob, HOW DO I KNOW WHICH NSURLConnection returned? I need to know so I can take action specific to the type of data that came. (Eg. display a twitter update if it was the twitter xml data)(Eg. display an image if it was a photo)

人们通常如何解决这个问题？ / p>

How do people usually solve this?

推荐答案

您保留指向委托中两个连接的指针，并将它们与连接参数连接：didReceiveData：和 connectiondidFinishLoading：

You keep pointers to both connections in the delegate, and compare these to the connection parameter in connection:didReceiveData: and connectiondidFinishLoading:

例如：

@interface Foo : NSObject {
    NSURLConnection *connection1;
    NSURLConnection *connection2;
}

和

connection1 = [NSURLConnection connectionWithRequest:request1 delegate:self];
connection2 = [NSURLConnection connectionWithRequest:request2 delegate:self];

和

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    if(connection == connection1) {
        // Connection 1
    } else if(connection == connection2) {
        // Connection 2
    }
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    if(connection == connection1) {
        // Connection 1
    } else if(connection == connection2) {
        // Connection 2
    }
}

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