IPhone SDK UISegmentedControl and hiding view

Question

Hello,
Im slowly getting to grips with the iPhone SDK but having a problem today, I have a UISegmentedControl setup to a toggleSetting function but this toggleSetting calls a url in the background for some data, but this freezes my application while the web request is taking place, this can take around 2 seconds and so I made another view (loadingView) with a loading screen thats animated and I want to show this whis the connection is taking place and then hide it again once complete.
I don't have any problems with showing or hiding the view until the web request happens.
When my app loads I call \[loadingView setHidde:YES] which hides my view straightaway, then my toggleSettings method is below, but this does not cause the view to show while the quest is taking place, I think it is showing an hiding it instantly as if I just ask to show it, it will show but only after the web call is complete. Anyone got any pointers???
<code>
-(IBAction)toggleSetting:(id)sender
[loadingView setHidden:NO];
UISegmentedControl *segmentedControl = (UISegmentedControl *)sender;
NSInteger segment = segmentedControl.selectedSegmentIndex;
if(segment==0) {
NSURL *url = [NSURL URLWithString:@"http://myurl"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil ];
[loadingView setHidden:YES];
</code>

Answer 1

I don't have code handy but take a look at the class reference for NSURLConnection and related calls.
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self startImmediately:YES]; would be a good start.
You want to use a call that will create some callbacks to update you when a connection is confirms, how many bytes are transfered, etc. so be sure to write the call functions.