Swift 2 init() with CF types and throws
Swift 2 init() with CF types and throws
- Subject: Swift 2 init() with CF types and throws
- From: Rick Mann <email@hidden>
- Date: Wed, 01 Jul 2015 16:28:51 -0700
I'm trying to do this:
class
Context
{
init()
throws
{
let cocoaCTX = NSGraphicsContext.currentContext()
guard let sysCTX = cocoaCTX.graphicsPort as! CGContextRef else { throw Errors.InvalidContext }
CGContext = sysCTX;
}
var CGContext : CGContextRef
}
But I'm getting
error: value of optional type 'NSGraphicsContext?' not unwrapped; did you mean to use '!' or '?'?
guard let sysCTX = cocoaCTX.graphicsPort as! CGContextRef else { throw Errors.InvalidContext }
^
!
In the typical if-let, you don't add the ?. If I do add the ?, I get:
error: '_??' is not convertible to '_??'
guard let sysCTX = cocoaCTX.graphicsPort? as! CGContextRef else { throw Errors.InvalidContext }
~~~~~~~~~~~~~~~~~~~~~^
Errors is an enum I created in a different file.
I always seem to trip up on the conditional optional unwrapping. Not sure what I'm doing wrong here. Help is much appreciated. Thanks!
--
Rick Mann
email@hidden
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