[How-to] Call back a function in the original class

Question

Hey guys,

I found some useful information on the web but I still can't manage to do it by myself ;)

Ok, let me put my problem in context for you :

I have a first class (myViewController) whose declaration is below :

// i just give you relevant information
RssParser *rssParser;
UIActivityIndicator *activityIndicator;

In my viewDidLoad method (myViewController) I have :

//once again, I summarize it for you
[activityIndicator startAnimating];
[rssParser parse];

Now, suppose you are in the parserDidEndDocument method (which is in RssParser class), how am I suppose to stop the animation of the activityIndicator ? How can I get access to my instance of activity Indicator from the RssParser class ?

Hope I made myself clear ;)

Thanks guys!

Gauthier

Answer 1

A common way to do this is to use a delegate. Check the RssParser class for the use of a delegate or implement one yourself. Set the delegate of rssParser to self in MyViewController. Now you can implement the method that is called after the document is parse with MyViewController. If you create an ivar for activityIndicator then you can easily access activityIndicator again.