What is the difference between:
[[UIApplication sharedApplication] delegate]
and
UIApplicationDelegate
views:
106answers:
1
+5
A:
UIApplicationDelegate is a protocol definition, which means it's a set of methods an object that conforms to it should implement.
[[UIApplication sharedApplication] delegate] is the way you have to ask for application delegate of your currently running application. That delegate should conform to UIApplicationDelegate.
pgb
2009-08-27 21:25:20
Thank you. That makes sense.What about the usual MyApplicationNameAppDelegate vs [[UIApplication sharedApplication] delegate]?
Bryan
2009-08-28 16:21:51
That's just usually a typecast. You would do `MyApplicationNameAppDelegate *d = (MyApplicationNameAppDelegate *)[[UIApplication sharedApplication] delegate]` and get the delegate casted to the class you use to implement it.
pgb
2009-08-28 19:57:06