Swift singleton implementation

Swift singleton implementation

var myInstance:ChatService?

class ChatService {

    class func instance() -> ChatService{
        if !myInstance {
            myInstance = ChatService()
            
            println("init")
        }
        
        return myInstance!
    }
}

...

var a = ChatService.instance()
var b = ChatService.instance()
println(a===b)

Try this threat-safe solution https://gist.github.com/HoldFast88/6258fb1693bc19de7a85