How to reuse Swift typealias in Objective-C code

Question

I'm creating a custom react-native module and I have this custom type in a swift file

VideoTrimmer.swift

typealias TrimCompletion = (Error?) -> ()

how do I import or reuse it in a file with objective code? Or what's the syntax to redeclare it? I'm not so familiar with Objective-C syntax.

VideoTrimmer.m

#import "React/RCTBridgeModule.h"
@interface RCT_EXTERN_MODULE(VideoTrimmer, NSObject)
  RCT_EXTERN_METHOD(trimVideo:(NSURL *)sourceURL destinationURL:(NSURL 
  *)destinationURL startTime:(int *)startTime endTime:(int *)endTime 
  completion:(TrimCompletion *)completion)
@end

score 19 · Accepted Answer · answered Jan 03 '18 at 01:07

19

Typealiases defined in Swift are not supported in Objective-C. However, you should be able redeclare the block type in Objective-C with typedef:

typedef void (^TrimCompletion)(NSError *);

answered Jan 03 '18 at 01:07

Eugene Berdnikov

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Can you post the Swift equivalent of the Objective-C code you posted. – Adrian Oct 29 '20 at 10:24
@Adrian it's in the question: `typealias TrimCompletion = (Error?) -> Void` – Eugene Berdnikov Oct 30 '20 at 04:55

How to reuse Swift typealias in Objective-C code

1 Answers1