How to create a global variable

Question

I have a global variable that needs to be shared among my ViewControllers   In Objective-C  I can define a static variable  but I can t find a way to define a global variable in Swift   Do you know of a way to do it

User · Accepted Answer

From the official Swift programming guide:

Global variables are variables that are defined outside of any function, method, closure, or type context. Global constants and variables are always computed lazily.

You can define it in any file and can access it in current module anywhere. So you can define it somewhere in the file outside of any scope. There is no need for static and all global variables are computed lazily.

 var yourVariable = "someString"

You can access this from anywhere in the current module.

However you should avoid this as Global variables are not good for application state and mainly reason of bugs.

As shown in this answer, in Swift you can encapsulate them in struct and can access anywhere. You can define static variables or constant in Swift also. Encapsulate in struct

struct MyVariables {
    static var yourVariable = "someString"
}

You can use this variable in any class or anywhere

let string = MyVariables.yourVariable
println("Global variable:\(string)")

//Changing value of it
MyVariables.yourVariable = "anotherString"

User · Answer

if you want to use it in all of your classes you can use   public var yourVariable    something    if you want to use just in one class you can use    var yourVariable    something

User · Answer

Global variables that are defined outside of any method or closure can be scope restricted by using the private keyword   import UIKit     MARK  Local Constants  private let changeSegueId    MasterToChange  private let bookSegueId      MasterToBook

[swift] How to create a global variable?

Examples related to swift

Examples related to global-variables