How to declare a constant in swift that can be used in objective c

Question

if I declare the swift constant as a global constant like:

let a = \"123\"

but the a cannot be found in

Answer 1

You should not have any problem by using let in Objective-C, next example was made with Xcode 7.2 :

MyClass.swift

import Foundation
import UIKit
@objc class MyClass : NSObject { // <== @objc AND NSObject ARE BOTH NECESSARY!!!
let my_color = UIColor( red:128/255,green:32/255,blue:64/255,alpha:1 ) // <== CONSTANT!!!
}

MyObjectiveC.m

#import "PROJECTNAME-Swift.h" // <== NECESSARY TO RECOGNIZE SWIFT CLASSES!!!
@interface MyObjectiveC ()
@end
@implementation MyObjectiveC
@synthesize tableview; // <== ANY UI OBJECT, JUST AS EXAMPLE!!!
- (void) viewDidLoad () {
MyClass * mc = [ [ MyClass alloc ] init ]; // <== INSTANTIATE SWIFT CLASS!!!
tableview.backgroundColor = mc.my_color;   // <== USE THE CONSTANT!!!
}
@end

PROJECTNAME is the name of your Xcode project, as shown in Project Navigator.