Objective-C Delegates: Have another class I call that parses XML. Need to know when its done externally

Question

I have a class that calls another class to parse (NSXMLParse) from a URL. Now I would like for the class calling this one to know when it has finished, so that I can populate the UI. I am guessing a delegate would be the way to go but ive never worked with one and would need some guidance as to how this would be wired.

Thanks

Answer 1

NSNotification is, in my opinion, the easiest way to setup something like this.

This is a small snippet from one of my apps:

in method.m when the something I'm processing has finished

[[NSNotificationCenter defaultCenter] postNotificationName:@"GlobalTagsReady" object:nil];

in the class to take care of the notification

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getTags) name:@"GlobalTagsReady" object:nil];

where @selector(getTags) is the method to be called