Objective-C macros from prefix project file header is not compiled when Swift file included in framework

Question

If remove swift file from project it is complied successfully. if add then get error.

Answer 1

#defines get converted to Swift by trying to figure out the type. For instance

#define B @"b"

...becomes:

var B: String { get }

Find details in this answer.

As your define #define MY_EXPORT does not provide a type, the conversion fails.

This code would work:

Prefix.pch:

#define MY_EXPORT @"Olala"

MyOneClass.m:

#import "MyOneClass.h"

@implementation MyOneClass

- (void)method {
    NSString *useIt = MY_EXPORT;
}

@end