WebView's don't support being layer-backed. But there is a private
WebUIDelegate method that will let you achieve what you want:
- (void)webView:(WebView *)sender didDrawRect:(NSRect)rect;
On 24 Oct 2009, at 00:53, Luke Evans wrote:
I have an app that plain stopped working between Leopard and Snow
Leopard.
This app relies on placing a WebView component in a Core Animation
layer view hierarchy (i.e. "Needs Core Animation Layer" flag is
turned on for this view and its superviews), so that I can draw
annotations over the web content with a mostly-transparent 'glass
view' in a layer above.
What I've found so far is that if I turn off the "Needs Layer" flag
on the WebView and all its superviews, then the web content is
visible. If I leave this flag on however, then all I get is a plain
white area, with no web content visible (though this continues to be
loaded).
I have logged this as a bug already - mostly because its a behaviour
change between Leopard and Snow Leopard, and I have not found any
documentation that indicate this is an intentional change.
However, it _might_ be intentional, or possibly I was already flying
by the seat of my pants to have it working in the first place. In
any case, perhaps somebody has some concrete knowledge on the
subject...?
Cheers
-- Luke
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