Re: referencing a Swift Dictionary from Objective-C
Re: referencing a Swift Dictionary from Objective-C
- Subject: Re: referencing a Swift Dictionary from Objective-C
- From: Charles Srstka <email@hidden>
- Date: Sun, 11 Sep 2016 00:31:08 -0500
> On Sep 11, 2016, at 12:16 AM, Gavin Eadie <email@hidden> 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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