hitTest based on center of UISegmentmentedControl returns UIToolbar

I'm experimenting with some code which probes a UI to see it's structure. As part of this I am doing a hitTest on a UISegmentedControl which is embedded in a UIToolbar at the bottom of the screen. I have a structure like this:

UIToolbar
    UISegmentedControl
        UISegment
        ...

I get the centre of the UISegmentedControl and hit test it lik开发者_如何学Pythone this:

UIView *view = // code which gets a reference to the UISegmentedControl.
frameInWindow = [view.window convertRect:view.frame fromView:view.superview];
CGPoint locationInWindow = CGPointMake(
                  frameInWindow.origin.x + 0.5 * frameInWindow.size.width,
                  frameInWindow.origin.y + 0.5 * frameInWindow.size.height);
UIView *target = [view.window hitTest:locationInWindow withEvent:nil];

I've been over this numerous times and I cannot see why it sets target to the UIToolbar instead of the UISegmentedControl. I would have expected target to be the same control. Or some UIView inside the segmented control.

The docs say:

"This method ignores view objects that are hidden, that have disabled user interaction, or have an alpha level less than 0.01. This method does not take the view’s content into account when determining a hit. Thus, a view can still be returned even if the specified point is in a transparent portion of that view’s content."

Is user interaction with your segmented control enabled?