On Wed, 01 Jun 2011 22:25:32 +0800, Roland King <r...@rols.org> said:
>I've been taking advantage of the fact that UIView's don't clip to their
>bounds by making my superview of size CGSizeZero and adding content to it.
>This means I can position the whole view hierarchy using its center, which is
>always at (0,0). This is very useful as my view has subviews which move all
>over the place and I really only care about the top left, the superview is
>just a convenient canvas to hang them on.
>
>I got bitten by that today however because none of my subviews get touches, I
>believe that's because a touch outside the superview bounds is ignored, the
>views are shown, they aren't clipped, but the touches are 'clipped'.
>
>Is there method call to tell a view to hitTest: out of its own bounds, just
>considering the subviews?
See chapter 18 of my book. Basically, your assessment is exactly right; all you
have to know is how hit-testing works. You touch outside your view, so as the
hit-test percolates down through the views it comes to your view and asks: was
this touch inside you? And your view says no, rightly, and that's the end of
that; we never get down to your view's subviews.
So clearly all you have to do is modify hit-testing, which is easy: your view
must test its subviews even if the touch is outside itself. Something like
this, in your UIView (largely off the top of my head, but this should work to
get you started):
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
UIView* result = [super hitTest:point withEvent:event];
if (result)
return result;
for (UIView* sub in [self.subviews reverseObjectEnumerator]) {
CGPoint pt = [self convertPoint:point toView:sub];
result = [sub hitTest:pt withEvent:event];
if (result)
return result;
}
return nil;
}
m.
--
matt neuburg, phd = m...@tidbits.com, <http://www.apeth.net/matt/>
A fool + a tool + an autorelease pool = cool!
Programming iOS 4!
http://www.apeth.net/matt/default.html#iosbook_______________________________________________
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