Question

I have a warning message when I load Game Center Leaderboards with:

GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init];
if (leaderboardController != nil) {
    leaderboardController.leaderboardDelegate = self;
    [self presentModalViewController:leaderboardController animated:YES];
}

Warning massage appears in third line, and It says:

warning: Semantic Issue: Assigning to
‘id’ from incompatible type
‘ViewMenuController *’

I understand the message but I don’t know how solve it.
The code works fine, but I would like remove the warning or find if there is a better way to load leaderboards.

Thanks in advance.

Solution:

I have done two modifications in ViewMenuController.h:

Add this import:

#import <GameKit/GameKit.h>

and modify this line adding :

@interface ViewMenuController : UIViewController <GKLeaderboardViewControllerDelegate> {

Thanks everybody for your help!

Answer 1

Best guess is when you are setting the leaderboardDelegate to self, it is expecting a id<GKLeaderboardViewControllerDelegate>, but your ViewMenuController does not define itself as conforming to the GKLeaderboardViewControllerDelegate protocol.

Make sure you set this in the interface of ViewMenuController.