Cannot call method in objective c - objective-c

Question

I'm having difficulty understanding how to call a method. Here's the code:
- (void)beachJSON
{
// Build the string to call Beach API
NSString *urlString = [NSString stringWithFormat:#"http://nrw-bwq-dev-api.azurewebsites.net/api/Pull"];
// Create NSURL string from formatted string
NSURL *url = [NSURL URLWithString:urlString];
// Setup and start async download
NSURLRequest *request = [[NSURLRequest alloc] initWithURL: url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection release];
[request release];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Store incoming data into a string
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
results = [jsonString JSONValue];
}
- (NSArray *)getBeachList {
[self beachJSON];
return results;
}
I call getBeachList from another class to populate 'results', beachJSON is called fine but I need to call
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
Within
- (NSArray *)getBeachList
i.e. right here
- (NSArray *)getBeachList {
[self beachJSON];
//This is where I want to call it to populate results before it is returned
return results;
}
Calling getBeachList will call beachJSON but the connection method will be skipped over leaving 'results' nil
If i try simply putting
[self connection:(NSURLConnection *)connection didReceiveData:(NSData *)data]
I get a expected expression error on that line.
I'm pretty new to objective c so any help would be great.

Answer 1

You don't need to call this method.
It's a delegate method of NSURLConnection.
What you need is to set a delegate for connection and method will be called by connection when it downloads any data.

Answer 2

You should not call connection:didReceiveData: by yourself. This is an event which is only supposed to be fired by the NSURLConnection instance. As far as I can see the only thing you are missing is the start call, which actually makes the NSURLConnection perform the request.
Try this:
NSURLRequest *request = [[NSURLRequest alloc] initWithURL: url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
Then you should see that your NSURLConnection instance will call your implementation of connection:didReceiveData:.
If you want to be sure that your data is fully loaded you should be using this event instead:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
The connection:didReceiveData: will be called multiple times if your data size is large enough. Every time the NSURLConnection receives data it will invoke connection:didReceiveData:. connectionDidFinishLoading: will only be called once when all your data is ready.