Question

In Java, the following code is fine, no error.

class ConstantA{
  public static String MY_TEST = "My Test";
}

---

import ConstantA;
Class TestClass{
  public void test(){
    System.out.println(ConstantA.MY_TEST); // it's work fine.
 }
}

According to above java concept, it doesn’t work on Objective-C,

in ConstantA.h file

extern NSString * const MY_TEST;
@interface ConstantA : NSObject
@end

in ConstantA.m file

NSString * const MY_TEST = @"My Test";
@implementation ConstantA
@end

in main.m file ( error occurs here)

#import "ConstantA.h"
int main(int argc, char *argv[])
{
    @autoreleasepool {
       NSLog(@"%@",ConstantA.MY_TEST); // error: Property 'MY_TEST' not found on object of type 'ConstantA'
    }
}

Can help me to solve this problem?
thanks so much

Answer 1

#import "ConstantA.h"
int main(int argc, char *argv[])
{
    @autoreleasepool {
        NSLog(@"%@", MY_TEST); // error: Property 'MY_TEST' not found on object of type 'ConstantA'
    }
}

Use directly the global variable, without class name:
MY_TEST and NOT ConstantA.MY_TEST.