Re: Drawing in a NSView out side of drawRect
Re: Drawing in a NSView out side of drawRect
- Subject: Re: Drawing in a NSView out side of drawRect
- From: "Michael Ash" <email@hidden>
- Date: Sat, 20 Dec 2008 00:19:37 -0500
On Fri, Dec 19, 2008 at 7:20 PM, David Alter <email@hidden> wrote:
> I want to draw in a NSView but not when drawRect is called.
Others have pointed this out, but I want to reiterate: no you don't.
Trying to draw outside of drawRect: will only lead to pain. (It is
useful, on rare occasions. You are not experiencing one of them.) Work
with the view machinery. Call -setNeedsDisplay:.
However, I'll also point out why your code currently doesn't work,
just for posterity:
> CGContextRef myContext =
> (CGContextRef)[[NSGraphicsContext currentContext]graphicsPort];
Right now you're getting the current graphics context, which is purely
arbitrary. Nothing has set it yet, so you're getting whatever happened
to be hanging around.
> [self lockFocus];
Now you lock focus, which sets the current context to the one for your
view. Since you grab the context before you set it, things don't work
very well.
Mike
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