Swift 1.2 notes

ClassAndInstances.swift

class ClassName : NSObject {
    
    static var i = 0
    
    // static / class function (seems the same)
    static func fn() {}
    class func fn2() {}

    init() {}

    // helper for access static member in instance func
    private var Class : ClassName.Type {
        get {
            return self.classForCoder as! ClassName.Type
        }
    }
    
    func ifn() {
        Class.fn()
        Class.fn2()
        Class.i
    }
}

// call init return instance
let instance = ClassName()

// class itself
let classItself = ClassName.self

// call init return instance
let instance2 = classItself.init()

// get class itself from instance
let cls = instance.classForCoder as! ClassName.Type

Singleton.swift

class Singleton : NSObject {

    static let sharedInstance = Singleton()

    // mark as private to prevent be called directly
    private override init() {

        println("\(__FUNCTION__)")

    }

}