A straight-forward way to inject NSViewControllers into the AppKit responder chain

gistfile1.txt

@interface DDControlledView : NSView

@property (weak) IBOutlet NSViewController *viewController;

@end

@implementation DDControlledView

- (void)setNextResponder:(NSResponder *)aResponder {
    NSViewController *controller = self.viewController;
    if (controller) {
        [super setNextResponder:controller];
        [controller setNextResponder:aResponder];
    } else {
        [super setNextResponder:aResponder];
    }
}

@end