dispatch_once after the Swift 3 GCD API changes

Question

What is the new syntax for dispatch_once in Swift after the changes made in language version 3? The old version was as follows.

var token: dispa         


        

Answer 1

Edit

@Frizlab's answer - this solution is not guaranteed to be thread-safe. An alternative should be used if this is crucial

Simple solution is

lazy var dispatchOnce : Void  = { // or anyName I choose

    self.title = "Hello Lazy Guy"

    return
}()

used like

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    _ = dispatchOnce
}