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Editorial Team
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Asked: 2026-05-26T02:06:15+00:00

I’d like to find out where a delegate specified exclusively as a property in

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I’d like to find out where a delegate specified exclusively as a property in a particular WWDC Live Demo Video is declared (Note: You’ll need an Apple Developer login to access the video).

The relevant code is listed below, omitting an iOS 5 property qualifier for NDA reasons. I believe this qualifier has no relevance for my query.

#import <UIKit/UIKit.h>
@class NSManagedObject;
@protocol CoffeeViewControllerDelegate;

@interface CoffeeViewController : UITableViewController
@property (_____,nonatomic) id <CoffeeViewControllerDelegate> delegate;
@end

@protocol CoffeeViewControllerDelegate <NSObject>
 // ...
@end

My questions are:

  1. Where is the delegate declared as a class member?
  2. Does the inheritance of the NSObject protocol by the CoffeeViewControllerDelegate protocol mean that runtime checking that the delegate has all NSObject methods will occur?
  3. Why is it necessary to forward declare NSManagedObject? Is this a common requirement when utilizing Core Data?

Many thanks for your time.

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1 Answer

  1. Editorial Team
    1. I think this is an LLVM (Apple’s new GCC replacement Objective-C compiler) feature, that means that the variable is create when you @synthesize the property (I’m not 100% sure about this)
    2. No. It would be checked at compile time
    3. You could also #import <CoreData/CoreData.h> but your code will compile more quickly just doing the forward declaration. Basically, it doesn’t need to know anything about the implementation other than the size of it (it’s an object so it’s a pointer)
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