Swift creates a singleton instance

Suppose a zlanimal class. I need to create TA when keeping a singleton

The practice in OC

    Static dispatch_once_t Oncetoken;    Dispatch_once (&oncetoken, ^{        _instance = [[Zlanimal alloc] init];    });

The approach in Swift is similar in that it creates a new class, Zlanimal class, that provides a quick way

Class Zlanimal:nsobject {    class var sharedmanager:zlanimal {        struct val{            static var oncetoken:dispatch_onc e_t = 0            static var staticinstance:zlanimal? = Nil        }        dispatch_once (&val.oncetoken, {()-Void in
   
    val.staticinstance = Zlanimal ()        })                return val.staticinstance!    }}
   

Controller call

        Let animal = Zlanimal.sharedmanager        println (animal) let                animal2 = Zlanimal.sharedmanager        println ( ANIMAL2)

Print the same address

<mySwift.ZLAnimal:0x7feebb508c60>

<mySwift.ZLAnimal:0x7feebb508c60>

It can also be more streamlined

Private Let sharedinstance = Zlanimal () class Zlanimal:nsobject {    class var sharedmanager:zlanimal {        return sha redinstance;}    }

Swift creates a singleton instance