Dfyjkt

I want this same statement repeated in all of my projects' viewDidLoad functions. I know I can just manually type it in but I am trying to find a way to increase my code speed. I don't know if I can use a extension file in this.

override func viewDidLoad() {
 super.viewDidLoad()

 let myswitchBoolValuefromFirstVc : Bool = UserDefaults.standard.bool(forKey: "mySwitch")// this is how you retrieve the bool value

 // to see the value, just print those with conditions. you can use those for your things.
 if myswitchBoolValuefromFirstVc == true 
 print("true")
 rosaryCounterLabel.isHidden = false
 
 else 
 print("false")
 rosaryCounterLabel.isHidden = true
 

If you are prepared to abuse the Objective-C runtime that UIViewController still uses, you can use method swizzling to do what you ask. https://medium.com/@abhimuralidharan/method-swizzling-in-ios-swift-1f38edaf984f

let aClass: AnyClass! = object_getClass(instance)
let originalMethod = class_getInstanceMethod(aClass, #selector(viewDidLoad))
let swizzledMethod = class_getInstanceMethod(aClass, #selector(newViewDidLoad))
if let originalMethod = originalMethod, let swizzledMethod = swizzledMethod 
 method_exchangeImplementations(originalMethod, swizzledMethod)

but I wouldn't recommend it. You trade between discoverability and repetition. In the case where you control all the code, it is going to be easier to maintain using a solution like subclassing that will still require some changes in every view controller.

Create a "master" view controller.

class MasterViewController: UIViewController 

 override func viewDidLoad() 
 super.viewDidLoad()


 //"Global" code here
 

And then inherit in all your other view controllers

class ViewController: MasterViewController

 override func viewDidLoad() 
 super.viewDidLoad()

 //controller specific code here