Question 130475 in Xcode Question posted in
Whether you're new to Xcode or an experienced developer, our archive has everything you need to know about this integrated development environment (IDE). From basic functionalities to advanced features, our archive covers a wide range of Xcode-related questions and answers. Browse our archive now and find solutions to your Xcode questions, and take your app development skills to the next level

Xcode – Calling a method from another view controller

I am trying to call a method from one view controller into another view controller, but it’s not working. I also tried looking into similar StackOverflow problems but I wasn’t able to get an answer.

Method from the First View Controller that I want to call (class is called SoprtsController)

Second View Controller where I want to call the method (class is called LastViewController

Tags:

2

Answers


  1. 0

    Like someone else mentioned it’s usually not good practice to call another view controller’s functions.

    Make sure your variable test has a value before you try to use it.

    Inside of viewDidLoad you can set a value test = SportsController()
    Or set a value when creating whatever view controller you’re in. lastVC.test = SportsController()

    Next time post your code in the question! It makes it easier to see the problem.

    func getCurrentSport() -> sports? {
   return currentSport
}

    var selectedSport: sports?
var test: SportsController?
var testSport: sports?

override func viewDidLoad() {
   super.viewDidLoad()
   testSport = test?.getCurrentSport()
   print(testSport?.sportName)
}
    Login or Signup to reply.
  2. 0

    You could use NotificationCenter. I only do this if I need to update a view in the presenting view controller before dismissing the current view controller.

    Add the following to the view controller that contains the method you are calling:

    private let notification = NotificationCenter.default

override func viewDidLoad() {
    super.viewDidLoad()
    addObservers()
}

private func addObservers() {
    notification.addObserver(self, selector: #selector(myMethod(_:)), name: Notification.Name.identifier, object: nil)
}

@objc
func myMethod(_ notification: Notification) {
    // Do whatever
}

    Then add the following to the view controller you are calling the method from:

    func callTheMethod() {
    NotificationCenter.default.post(name: Notification.Name.identifier, object: self, userInfo: nil)
}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search