Preventing user to access a view in a NSView hierarchy - objective-c

Question

Maybe this is my strange understanding of the NSView hierarchy, but the question is:
I have a window with a SplitViewController which has the classic two child views.
When the user clic a button on the toolbar I add a 'work in progress' view as follows:
NSView* workingView;
// creating the view
...
[self.view addSubView:workingView];
where self is the SplitViewController object. My understanding (also from iOS programming) is that the split view controller has three views: left and right views and the workingView onto them(?)
The problem is that, even if workingView is covering the entire window, the two views are still accessible. In iOS developing we can set the userInteraction to NO so only the desired view is active. What about OSX?
Can I disable interaction with the split view controller views and let only the workingView be active?
Thanks
EDIT:
I followed #Wain hint and I created a new ViewController that contains my work in progress view.
I presented it using the presentViewController:animator technique. In this way I can hav more control about the positioning of the view.
In the custom animator I simply colored the view to see what is happening. Really the way the animator adds the new view controller seems nearly the same as adding a classic view onto the split view (like did before). In fact the result is the same: even if my working view covers two buttons belonging to the left side of the split view, they are clickable!
-(void)animatePresentationOfViewController:(NSViewController *)viewController fromViewController:(NSViewController *)fromViewController {
NSViewController* bottomVC = fromViewController;
NSViewController* topVC = viewController;
topVC.view.wantsLayer = YES;
topVC.view.layerContentsRedrawPolicy = NSViewLayerContentsRedrawOnSetNeedsDisplay;
topVC.view.alphaValue = 0.0f;
[bottomVC.view addSubview:topVC.view];
topVC.view.layer.backgroundColor = [[NSColor blueColor] CGColor];
topVC.view.frame = CGRectMake(10, 10, 100, 100);
[NSAnimationContext runAnimationGroup:^(NSAnimationContext* context){
context.duration = 1.0f;
topVC.view.animator.alphaValue = 1.0f;
} completionHandler:nil];
}
I know something is missing or wrong... May you help me in understanding what is going on here?

Answer 1

You should create a new view controller to manage your new view and then present it as a form sheet. The display style is slightly different on each platform but this is the correct approach.
An alternative is the screenshot the split view and pass the image to the new controller which is presented full size. It then applies an overlay and adds its own content view in front of the background image.