CODEWITHSUNDEEP
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Tometoyou
Tometoyou

Reputation: 8386

Making sure singleton properties aren't accessible via other instance

I have a singleton class:

final class NotificationSingleton : NSObject {
    static let sharedInstance = NotificationSingleton()
    var aProperty: String!
    var anotherProperty: Int!
}

How can I make sure that aProperty and anotherProperty are only accessible through the sharedInstance?

Upvotes: 0

Views: 36

Answers (2)

Jonah
Jonah

Reputation: 17958

You could use failable initializers to prevent the creation of additional NotificationSingleton instances once your sharedInstance has been set.

I suspect this sort of defensive programming will actually make the class hostile to use by other developers in the future, difficult to test, and that there's probably a cleaner solution available which doesn't rely on singletons as globals but there you go.

Upvotes: 0

Christian Dietrich
Christian Dietrich

Reputation: 11868

you can make the initializer private thus no other instances can be created

private override init() {}

Upvotes: 2

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