CODEWITHSUNDEEP
iosobjective-cswiftxcode
Shahbaz Akram
Shahbaz Akram

Reputation: 1657

use #define in objective C and access in swift class

I have define #define baseUrl [NSString stringWithFormat:@"%@api/v4", MAINURL] in objective c class and can access anywhere in project. But now i have created swift file in exiting objective c project and want to access baseurl in swift but error received. 

Use of unresolved identifier 'baseUrl'

how can resolve it?

Upvotes: 5

Views: 4501

Answers (2)

mag_zbc
mag_zbc

Reputation: 6993

Importing Objective-C macros into Swift doesn't always work. According to documentation:

Swift automatically imports simple, constant-like macros, declared with the #define directive, as global constants. Macros are imported when they use literals for string, floating-point, or integer values, or use operators like +, -, >, and == between literals or previously defined macros.

C macros that are more complex than simple constant definitions have no counterpart in Swift.

An alternative in your case would be to use a function that returns the value defined by macro

// .h file
#define baseUrl [NSString stringWithFormat:@"%@api/v4", MAINURL]
+ (NSString*) BaseUrl;

// .m file
+ (NSString*) BaseUrl { return baseUrl }

Upvotes: 9

Tuesleep
Tuesleep

Reputation: 119

Unfortunately, Objective-C #define could not access by swift.

Maybe you change your #defines to actual constants, which is better than #defines.

Or create a swift object hold some static variable.

For example:

class API: NSObject {
    static let apiPrefix = "https://vvv"
    static let apiPosts = apiPrefix + "posts"
}

Calling: API.apiPosts

Upvotes: 0

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