如何检测 NSURLConnection 何时完成
我正在尝试使用 NSURLRequest 和 NSURLConnection 从 Web API 获取少量数据（大约 50 字节）。我很确定下面的代码是正确的，但是我如何实际获取接收到的数据并检测其何时全部下载？
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0];
NSURLConnection *con = [[NSURLConnection alloc] initWithRequest:req delegate:self];
I'm trying to use NSURLRequest and NSURLConnection to get a small bit of data (around 50 bytes) from a web API. I'm pretty sure the code below is right, but how do I actually get the received data and detect when its all downloaded?
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0];
NSURLConnection *con = [[NSURLConnection alloc] initWithRequest:req delegate:self];
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通过实现NSURLConnectionDelegate，您可以在
connection:didReceiveData:方法中获取数据，并且当操作结束时将调用connectionDidFinishLoading:方法。同时，如果操作过程中出现错误，connection:didFailWithError:将会被调用。By implementing NSURLConnectionDelegate, you can get the data in
connection:didReceiveData:method and theconnectionDidFinishLoading:method will be called when the the operation is over. Meanwhile ,connection:didFailWithError:will be called if there is some error during the operation.您将自己设置为代理人，连接将随时向您发送呼叫。
例子：
http://developer.apple.com/库/mac/#documentation/Cocoa/Conceptual/URLLoadingSystem/Tasks/UsingNSURLConnection.html
you set yourself as the delegate and the connection will send you calls as it goes.
example:
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/URLLoadingSystem/Tasks/UsingNSURLConnection.html
您必须使用委托的方法，请阅读此处的文档： http://developer.apple.com/library/mac/#documentation/Foundation/Reference/NSURLConnectionDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intf/NSURLConnectionDelegate
You have to use delegate's methods, read the documentation here: http://developer.apple.com/library/mac/#documentation/Foundation/Reference/NSURLConnectionDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intf/NSURLConnectionDelegate