Assigning to 'id<Delegate>' from incompatible type 'ViewController *const_strong'

Question

Throughout my app, I'm getting semantic issue warnings when I set ViewController.delegate = self. I have searched and found similar posts but none were able to solve my problem.

ViewController.m:

GameAddViewController *gameAddViewContoller = [[navigationController viewControllers] objectAtIndex:0];
gameAddViewContoller.delegate=self;

I get the error message when setting .delegate=self.

GameAddViewController.h:

@protocol GameAddViewControllerDelegate <NSObject>

- (void)gameAddViewControllerDidCancel:(GameAddViewController *)controller;
- (void)gameAddViewController:(GameAddViewController *)controller didAddGame:(Game *) game;

@end

@interface GameAddViewController : UITableViewController <GameAddViewControllerDelegate>
{
sqlite3         *pitchcountDB;
NSString        *dbPath;
}
@property (nonatomic, strong) id <GameAddViewControllerDelegate> delegate;
...
@end

ViewController.h:

#import "GameAddViewController.h"

@class ViewController;
@protocol ViewControllerDelegate <NSObject>
- (void)ViewControllerDidCancel:(ViewController *)controller;

@end
@interface ViewController : UIViewController <ViewControllerDelegate>
-(void) checkAndCreateFile;
@end

Can anyone point me in the right direction to resolve the warning messages?

giorashc · Accepted Answer · 2012-03-25 16:09:26Z

up vote40down voteaccepted

At this line :

gameAddViewContoller.delegate=self;

Notice that self is of type ViewController which does NOT conform to the GameAddViewController protocol.

answered Mar 25 '12 at 16:09

giorashc
10.1k31644

1

What do I need to do to fix this. Is there something I need to change in the GameAddViewController protocol? – David L Mar 25 '12 at 21:30

Well, it depends on who you want to be your delegate. Who is implementing the GameAddViewController protocol – giorashc Mar 26 '12 at 7:39

GameAddViewController is the child of ViewController and I am implementing the gameAddViewControllerDidCancel method in ViewController. The error message is from the prepareForSegue method in ViewController when I set gameAddViewContoller.delegate=self. – David LMar 26 '12 at 23:51

1

So do as @borrrden suggested. Conform the ViewController to the GameAddViewControllerDelegate delegate. – giorashc Mar 27 '12 at 7:25

21

OK, so I finally got it. I added this to my header file //#import "GameAddViewController.h" @interface ViewController : UIViewController <GameAddViewControllerDelegate> @end// – David L Mar 28 '12 at 4:25

show 1 more comment

Raul Lopez Villalpando · Answer 2 · 2013-10-16 22:58:51Z

For me what ended up happening is that I wasn't adding the delegate to the @interface on my header file

For example

@interface TheNameOfYourClass : UIViewController <TheDelegatorClassDelegate>

@end

borrrden · Answer 3 · 2012-03-25 16:03:21Z

You are putting the < GameAddViewControllerDelegate > in the wrong place. It doesn't go on GameAddViewController, it goes on ViewController.

Custom Bonbons · Answer 4 · 2014-07-28 12:29:09Z

This might help other people who are adding Multipeer Connectivity straight to a ViewController. At the top of myViewControllerName.h add '<MCSessionDelegate>':

@interface myViewControllerName : UIViewController<MCSessionDelegate>

Assigning to 'id<Delegate>' from incompatible type 'ViewController *const_strong'

Assigning to 'id<Delegate>' from incompatible type 'ViewController *const_strong'

4 Answers