Swift: Singleton object example

gistfile1.swift

/// Swift 2 syntax
class MyManager: NSObject {

    static let sharedInstance = MyManager()
    
    // Ensure the class cannot be initialized from outside by declaring a private initializer
    private override init() {
        super.init()
        // Do your internal initialization privately
    }
}

/// Swift 1.x syntax
class MyManager: NSObject {

    class var sharedInstance : MyManager {
        struct Static {
            static let instance : MyManager = MyManager()
        }
        return Static.instance
    }
    
    // Ensure the class cannot be initialized from outside by declaring a private initializer
    private override init() {
        super.init()
        // Do your internal initialization privately
    }
}