如何调用从视图控制器到应用程序委托的所有方法和函数？

Question

Hi am developing a app using swift2 in my app i want to track location for every 5 minutes when user successfully logged in now i can successfully track location of the user now i want to track when the app is in backgrounded for that i have to use app delegate but all functions and methods are i wrote in view controllers only so how can i call view controllers method and function to app delegate.

code in viewController :

class ThirdViewController: UIViewController{

In view did load:

 {

  //////   i created timer scheduled with time internal  /////

 }

 //////   Here am fetched current locations and performed some function for timer to execute   //////

 }

In my appDelegate :

func applicationDidEnterBackground(application: UIApplication) {

 if UIApplication.sharedApplication().applicationState != .Active{

 //here i have to call that timer function execute how to do that????

}

Answer 1

You can fire notification when app goes to background

func applicationDidEnterBackground(application: UIApplication) {

 if UIApplication.sharedApplication().applicationState != .Active{

  NSNotificationCenter.defaultCenter().postNotificationName("Notificationname", object: nil)
}
}

in your controller view did load dd observer for notification

// add observer for notification.
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(self.notificationReceived), name: "Notificationname", object: nil)

Method handler for received Notification

func notificationReceived() {
// do what you want to do here.
}

Answer 2

You would want to create a class with your function inside it and then call it from your app delegate, you can do this like this:

• Create a swift file with the name of your class eg MyClass.swift
• Then you create the class in your file and add the function in it:

class MyClassName { Add your function in here }

• Then you call it from appDelegate.swift like this:

  let myClassVar: MyClassName?

• Then call the function like this -> myClassVar.functionName

Answer 3

Like this,

func applicationDidEnterBackground(application: UIApplication) {

    if UIApplication.sharedApplication().applicationState != .Active{
      let thirdViewController = ThirdViewController()
      thirdViewController.functionYouWantToCall()
 }

Thanks :)