How to refresh a connection with NSURLConnection - objective-c

Question

I'm working on a project for school, and I was wondering if there was a way to actually update the connection with NSURLConnection if a user submits something. For example, I'm having twitter search based on username, and I have a default username set up when the view loads. What would I have to do to refresh that connection when a user enters a different username on that page? I have my button handlers all set up, and I'm using the same code as in my viewDidLoad function. Is there a method call or something that will actually reset the connection?
Thanks,
David

Answer 1

I attached example codes
// member variable 'conn'
// NSURLConnection *conn;
// #property(strong, nonatomic) NSURLConnection *conn;
-(void)viewDidLoad {
[super viewDidLoad];
[self sendRequest];
}
- (IBAction)sendButtonClicked {
[self sendRequest];
}
- (void)sendRequest {
if (self.conn) {
[self.conn cancel];
self.conn = nil;
}
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.google.com"]];
NSURLConnection *conn = [NSURLConnection connectionWithRequest:request delegate:self];
self.conn = conn;
[conn start];
}
// NSURLConnection Delegates
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
// append received data
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
// error handling
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// using data
}

Answer 2

I don't think you can "reset" the connection. You will have to make a new request. In your button clicked method simply make a new request call with the new user name.
It works like a request in a browser, when you change some parameter in the url the browser sends of a new request to the web-server.
have a look at this example by apple (if you dont need the caching part just focus on URLCacheConnection.h/.m) http://developer.apple.com/library/ios/#samplecode/URLCache/Listings/Classes_URLCacheController_m.html#//apple_ref/doc/uid/DTS40008061-Classes_URLCacheController_m-DontLinkElementID_10
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