NSToolbarDelegate Error?

Im creating a NSWindowController and its window programatically. So i create a simple NSToolbar with:

NSToolbar *toolbar = [[NSToolbar alloc] initWithIdentifier:@"PreferencesToolbar"];

[toolbar setDisplayMode:NSToolbarDisplayModeIconAndLabel];
[toolbar setAllowsUserCustomization:NO];
[toolbar setAutosavesConfiguration:NO];

[self.window setToolbar:toolbar];

[toolbar release];

Which all works fine, but when I add [toolbar setDelegate:self];

I get the following error:

ERROR: invalid delegate (does not implement all required methods), and so can not be used! (To debug, add a breakpoint to NSToolbarError

According to NSToolbarDelegate there are no required methods, so what is going wrong here?

Solution

In order to make the toolbar work with your NSWindowController subclass as its delegate, you must declare it to conform to NSToolbarDelegate protocol :

@interface MyController : NSWindowController <NSToolbarDelegate>

Also, from the doc, you must ensure that some are implemented, even if they are optional, because you created the toolbar programmatically. They are :

-(NSToolbarItem *)toolbar:(NSToolbar *)toolbar
    itemForItemIdentifier:(NSString *)itemIdentifier
willBeInsertedIntoToolbar:(BOOL)flag;

-(NSArray *)toolbarAllowedItemIdentifiers:(NSToolbar *)toolbar;

-(NSArray *)toolbarDefaultItemIdentifiers:(NSToolbar *)toolbar;

Important While this method is marked as @optional in the NSToolbarDelegate protocol , it must be implemented if the associated toolbar is created programatically. Toolbars created in Interface Builder can implement this method to augment functionality.