当有多个 NSURLConnection 时，如何识别哪个 NSURLConnection 完成加载? [英] How to identify WHICH NSURLConnection did finish loading when there are multiple ones?

问题描述

多个 NSURLConnections 正在启动(在单个 UIViewController 中)以收集不同类型的数据.当他们返回 (-connectionDidFinishLoading) 时，我想根据到达的数据类型处理数据.但是有一个问题，我怎么知道 NSURLConnection 返回了哪个?我需要知道，以便我可以针对出现的数据类型采取行动.(例如，如果是 twitter xml 数据，则显示 twitter 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?

How do people usually solve this?

推荐答案

您在委托中保留指向两个连接的指针，并将它们与 connection:didReceiveData:<中的 connection 参数进行比较/code> 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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