Where do I declare a variable on app launch, that accesses ViewController properties?

Question

So I have a class of which I want to create an instance as soon as the app launches. I would like to initialize some of its properties from switches/toggles in my ViewController.

Here is the class, of which I am trying to create an instance:

import Foundation

class PropertyCollection {
    var property1: Bool

    init (property1: Bool) {
        self.property1 = property1

    }

    func disableAll() {
        self.property1 = false

    }

    func enableAll() {
        self.property1 = true

    }

    func info() -> String {
        return "The properties are: \(property1)"
    }

}

So: Putting the declaration in AppDelegate.swift gives me an error ("Use of unresoved identifier 'property1Switch'"):

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        var thePropertyCollection: PropertyCollection = PropertyCollection(property1: property1Switch.isOn)

        return true
    }

Adding "ViewController." in front of "property1switch" doesn't help either. I get another error ("Instance Member 'property1Switch' cannot be used on type 'ViewController'")

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    var thePropertyCollection: PropertyCollection = PropertyCollection(property1: ViewController.property1Switch.isOn)

    return true
}

But I am not trying to "use type 'property1Switch' on type 'View Controller'". I thought this was how you reference stuff from other classes?

Can you please share code of class PropertyCollection? is PropertyCollection is a controller class? — Dheeraj D, Apr 07 '17 at 07:59
Added the class. I do not know what a controller class is, but my guess is no. — Marmelador, Apr 07 '17 at 08:04

score 0 · Answer 1 · answered Apr 07 '17 at 08:06

0

It should be like this:

See you are initializing this object, so you must provide it initial value.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        var thePropertyCollection: PropertyCollection = PropertyCollection(property1: true)

        return true
}

answered Apr 07 '17 at 08:06

Dheeraj D

4,386
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That is not what I am trying to do. I do wish to provide an initial value, but it should come from `property1Switch` which is a property of `ViewController`. That is where the problem arises. – Marmelador Apr 07 '17 at 08:28

score 0 · Answer 2 · edited May 23 '17 at 12:10

0

You may be in dealing with a similar issue as this one: 'Use of Unresolved Identifier' in Swift One possible issue is that your new class has a different Target(s) from the other one.

For example, it might have a testing target and the other doesn't. For this specific case, you have to include all of your classes in the testing target or none of them.

edited May 23 '17 at 12:10

Community

1
1

answered Apr 07 '17 at 09:04

Ding Qiu

64
3

Where do I declare a variable on app launch, that accesses ViewController properties?

2 Answers2