Do I need to keep the reference to a singleton object to avoid repeated initialisation?-CodePudding

Imagine that we have some singleton object:

class Singleton {
    static var shared = Singleton()

    private init() { ... }
}

Am I right that if I don't keep the reference in some place, it is initialised again and again due to the ARC every time I access it, like this:

Singleton.shared.doSomething()
var a = Singleton.shared.returnSomething()

If I am, where to keep the reference in the iOS app? In classes that use the singleton? Or in AppDelegate, to ensure using the same instance without repeated initialisation?

CodePudding user response：

By assigning it to a static value you retain the shared instance and don't need to reinitialise it. Static values exist at class level, not instance level, so are retained, effectively, indefinitely.