Re: NSGraphicsContext currentContext() returns nil on OSX 10.11
Re: NSGraphicsContext currentContext() returns nil on OSX 10.11
- Subject: Re: NSGraphicsContext currentContext() returns nil on OSX 10.11
- From: email@hidden
- Date: Mon, 12 Oct 2015 21:24:44 +0900
> On Oct 12, 2015, at 8:45 PM, Lakshmi P Shanmugam <email@hidden> wrote:
>
> I'm running our application on OSX 10.11. NSGraphicsContext
> currentContext() returns nil in one of the drawing methods. The same code
> works fine on OSX 10.9.5 and 10.10.3.
> According to the documentation, currentContext returns an instance of a
> concrete subclass of NSGraphicsContext. It doesn't mention that it can
> return nil.
>
> Is this is a known issue with OSX 10.11? Are there valid/un-documented
> cases when currentContext can return nil?
Apple docs can be sparse.
It's implicit in 10.11 if it doesn't say nonnull or it isn't wrapped in NS_ASSUME_NONNULL
The Swift version returns an Optional.
So yes it can return nil.
If your view is not in a view hierarchy in a window, it can be nil.
In its essence a graphics context is a rect that can be drawn into.
You can also draw into a bitmap context but that is really a buffer of sorts.
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