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: Gavin Eadie <email@hidden>
- Date: Sun, 11 Sep 2016 10:27:28 -0400
> On Sep 11, 2016, at 1:31 AM, Charles Srstka <email@hidden> wrote:
>
>> 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
.. nearly! We just need "static" on the property:
class Constants: NSObject {
static let colorLookup: [String : UIColor] = ...
}
.. thanks, Charles
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