Re: How do I get a CGContextRef?
Re: How do I get a CGContextRef?
- Subject: Re: How do I get a CGContextRef?
- From: Roland King <email@hidden>
- Date: Sun, 23 Nov 2008 10:43:18 +0800
well where are you calling it?
That's the correct function, but only works when there is a graphics
context set, and that's only inside drawRect: in a UIView.
I wandered through the documentation a little and got reasonably lost,
it does talk about NSGraphicsContext in there, but remember a lot of
the documentation was dragged over from OS X and some of the stuff in
there doesn't exist on iPhone, NSGraphicsContext is one of them. I
don't see any way to create one for the iPhone window, you can create
bitmap ones I suspect, I think you need to be in drawRect:, but then
again, if you're not, why do you want one?
I'm going to have to dive into the whole quartz and drawing code one
day as I suspect there is a lot of great stuff down there .. but it's
daunting.
On Nov 23, 2008, at 9:48 AM, DKJ wrote:
On 22-Nov-08, at 17:40 , Ken Ferry wrote:
Take a look here:
Thanks for the reference, but I'm doing this for iPhone, and the
procedure seems to be different. The compiler doesn't recognise the
NSGraphicsContext class. I tried using the
UIGraphicsGetCurrentContext function, but that doesn't work either:
I get an "invalid context" error when I use it in CGContextStrokeRect.
dkj
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