Question

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?

Answer 1

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.