Using Objective-C Enum in Swift

Question

I'm calling an Objective-C method in my swift 2.3 code in Xcode 8.2 (build target 8.0). It accepts an NS_ENUM as a parameter:

typedef NS_ENUM(NSUInteger, MLCMultipleChoiceSlideSubtype) {
  MLCMultipleChoiceSlideSubtypeQA,
  MLCMultipleChoiceSlideSubtypeFillInTheBlank,
  MLCMultipleChoiceSlideSubtypeUnknown
};

The .h file containing this enum and method is in my bridging-header.h file. This is the signature of the objc method:

+ (nullable instancetype)slideWithSubtype:(MLCMultipleChoiceSlideSubtype)subtype testSlide:(nonnull TestSlide *)slide distractorFinder:(nonnull MultipleChoiceDistractorFinder *)distractorFinder;

Then I call it from Swift 2.3 like this:

if let mcSlide = MultipleChoiceSlide(subtype: .QA, testSlide: slide, distractorFinder: distractorFinder) {
    return mcSlide
}

This works fine when I compile it for debug and run it. However, when I try to archive it and compile for release, I get this message:

  ... LessonConvertToMultipleChoiceOperation.swift:55:64: Static member 'QA' cannot be used on instance of type 'MLCMultipleChoiceSlideSubtype'

I have no idea why this only happens when I archive the build or what to do to fix it.

Edit: Based on answers to similar problems I saw elsewhere, I changed the archive build configuration from Release to Debug in my scheme, and now it archives. This doesn't seem like a good thing to do however. Will the archive contain my debug symbols by doing this?

It sounds like something being present on your system, but not properly in compile sources. I am not an expert on this matter at all though. — Sethmr, Mar 31 '17 at 21:04
This is very difficult to answer without seeing the whole project. Look for differences between "Debug" and "Release" configurations. Maybe something that is needed is wrapped inside `#ifdef DEBUG`? guard? — Sulthan, Apr 01 '17 at 07:14

score 0 · Answer 1 · edited May 23 '17 at 12:32

0

It turns out that I needed to call the method like this:

if let mcSlide = MultipleChoiceSlide.init(subtype: .QA, testSlide: slide, distractorFinder: distractorFinder) {
   return mcSlide
}

Although I'm not sure why adding .init helps.

Clue found here

edited May 23 '17 at 12:32

Community

1
1

answered Apr 03 '17 at 14:26

ASchuerholz

21
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Using Objective-C Enum in Swift

1 Answers1