This is pretty normal debugger behavior for me. Issues with printing
variables clearly in scope, using types or operators from other modules, and
poor performance happen every time I try to debug Swift under Xcode. I’ve never
found anything that works reliably.
Jon
> On Jan 31, 2017, at 1:54 PM, Maury Markowitz via swift-users
> <swift-users@swift.org> wrote:
>
> I hope this is the right place to ask this:
>
> I'm using Xcode Version 8.2.1 (8C1002) and I'm trying to find out what's
> going wrong in my Swift3 app. Here's the code:
>
> let background = sceneView.snapshot().cgImage!
> let cropped = background.cropping(to: overlayView.frame)
> UIGraphicsBeginImageContextWithOptions(overlayView.frame.size,
> false, 1.0)
>
> I have a breakpoint on the first line. When it trips I F6 to the next line
> and examine background:
>
> (lldb) p background
> (CGImage) $R0 = 0x00000001741d4370 {}
> Printing description of background:
> <CGImage 0x1741d4370>
> <<CGColorSpace 0x170024480> (kCGColorSpaceICCBased;
> kCGColorSpaceModelRGB; sRGB IEC61966-2.1)>
> width = 640, height = 998, bpc = 8, bpp = 32, row bytes = 2560
>
> Now I hit F6 again and do the same thing:
>
> (lldb) p background
> error: <EXPR>:3:1: error: use of unresolved identifier 'background'
> background
> ^~~~~~~~~~
>
> This happens to pretty much every variable in the app, after running another
> line or two, it apparently disappears. This is particularly annoying in this
> case, because QuickLook fails almost every time, which makes debugging image
> work somewhat difficult.
>
> I've cleaned and rebooted and it keeps coming back. Any suggestions?
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