Use constants in Swift like Objective-C

Question

How i can use global constants like:

#define EXAMPLE 123

from Objective-C in Swift???

I need to use string constants, which must be defined in AppDelegate to use in all App with #include "AppDelegate.h" in each class files.

Make one constant file and Declare all constants there. If you r using objective c then make one pch file & import that constant file OR if you use swift then you can directly access that constant without importing anything — Jitendra Modi, Oct 04 '16 at 08:43

score 3 · Answer 1 · answered Oct 04 '16 at 08:44

3

I suggest making a structure, in a seperate file, with its properties as let constants. So something like this

struct myConstants {
    static let firstConstant = "hello"
    static let secondConstant = "goodbye"
}

answered Oct 04 '16 at 08:44

Caspar Wylie

Thank you! I'll try to use it, but i can't set your answer as helpful. Reputation resist it. Sorry – Ivan Trubnikov Oct 04 '16 at 08:48
No worries. Happy to help. – Caspar Wylie Oct 04 '16 at 08:58
I must use #import or #include to see this constants I'm other files??? In obj-C i must #import "GlobalConst.swift" to see it in other files... – Ivan Trubnikov Oct 04 '16 at 09:00
No. you should be able to just refer to it directly ... ? – Caspar Wylie Oct 04 '16 at 09:01
Maybe something wrong, because xCode say that i used unresolved identifier. I just create new source file named GlobalConst.swift, put structure from your example in this file. and save it ))) – Ivan Trubnikov Oct 04 '16 at 09:04
That error is really annoying but it shouldn't really be happening. I cannot help much without seeing it for myself but read this and its discussed in depth http://stackoverflow.com/questions/24029781/how-do-i-import-a-swift-file-from-another-swift-file – Caspar Wylie Oct 04 '16 at 09:06
Everything is all right now! Thanks! I forgot use struct name to find this constants ))) It's hard to change mind from Obj to Swift at first steps ))) – Ivan Trubnikov Oct 04 '16 at 09:07
Great. Good luck. – Caspar Wylie Oct 04 '16 at 09:08

score 2 · Answer 2 · answered Oct 04 '16 at 08:44

2

Just create a Struct class and make each property/function static.

struct Global {
    static var test = "Some value"
}

Call it Global.test

answered Oct 04 '16 at 08:44

Rashwan L

I don't like the 'struct class' expression. Structs are not classes. – Michal Cichon Jun 20 '17 at 13:36

2 Answers2