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Why not drawRect: a call?

I have a subclass NSView foothat overrides drawRect:

- (void)drawRect:(NSRect)dirtyRect
{
    [self doStuff];
}

I would expect that whenever I add an instance of barmy class as a subtitle of another view, barit would be redrawn. However, when I add baras the contentViewmain window in my application, I do not see this to be the case.

I tried adding another override:

- (void)viewDidMoveToSuperview
{
    self.needsDisplay = YES;
}

... in the hope that when the barsupervisor receives it, it will invalidate its display and lead to redrawing. There is no such luck ( viewDidMoveToSuperviewcalled, but not drawRect:).

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, : NSScrollView drawRect:?

+4
1

[view display]; needsDiplay?

-2

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