> On Sep 11, 2016, at 12:16 AM, Gavin Eadie <[email protected]> wrote:
>
> I’m moving some code from Obj-C to Swift and, from time to time, I open a gap
> I cannot see across. This is one, and I’d love some assistance.
>
> I converted a pile of utility Obj-C code that included a class method of the
> form on the rhs of:
>
> xxx = [UIColor colorFromName:@"aliceblue"]
>
> In the new Swift replacement of the utility code, I added a global constant
> Dictionary of the form:
>
> public let colorLookup = [
> "aliceblue" : UIColor.init(colorLiteralRed:0.0, green:0.5, blue:1.0,
> alpha:1.0),
> …
> ]
>
> and changed the Obj-C call to
>
> xxx = colorLookup[@"aliceblue"]
>
>
> The Obj-C compiler complains that the subscript is not numeric. It also
> appears to not be able to resolve the global constant "colorLookup" (which
> probably explains the error in the previous sentence). I notice that
> "colorLookup" doesn’t appear in "Utilities-Swift.h" ..
>
> There are other (and better) ways I could code this, but I’m curious why
> "colorLookup" is invisible to Objective-C .. Thanks, Gavin
Wrap the variable in an Objective-C class and it should be fine:
public class Constants: NSObject {
public let colorLookup: [String : UIColor] = ...
}
Charles
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