Uso del identificador no resuelto 'Estático'

He actualizado xcode 8.0 swift 3 y encontré muchos errores. Este es uno de ellos :

Uso del identificador no resuelto 'Estático'

Esta es mi class que creé y trabajé en la versión anterior xcode 7.3.1 swift 2.

import UIKit enum FONTSIZE:Int { case sizesmall = 1 case sizesbig = 2 case sizemedium = 3 } class sizeFont: NSObject { private static var __once: () = { Static.instance = sizeFont() }() class func getSize(_ enumFont : FONTSIZE) -> CGFloat { var siz = 17 switch(enumFont){ case .sizesbig: if((UserDefaults.standard.value(forKey: "fontsize") as AnyObject).int32Value == 0){// kecil if(isphone()){ siz = 22//17 }else{ siz = 22//24 } }else if((UserDefaults.standard.value(forKey: "fontsize") as AnyObject).int32Value == 1){// besar if(isphone()){ siz = 30//19 }else{ siz = 30//28 } }else{ if(isphone()){ siz = 22//17 }else{ siz = 22//22 } } break case .sizesmall: if((UserDefaults.standard.value(forKey: "fontsize") as AnyObject).int32Value == 0){// kecil if(isphone()){ siz = 17//15//12 }else{ siz = 24//22//19 } }else if((UserDefaults.standard.value(forKey: "fontsize") as AnyObject).int32Value == 1){// besar if(isphone()){ siz = 19//17//15 }else{ siz = 28//26//24 } }else{ if(isphone()){ siz = 17//15//12 }else{ siz = 24//22//19 } } break case .sizemedium: if((UserDefaults.standard.value(forKey: "fontsize") as AnyObject).int32Value == 0){// kecil if(isphone()){ siz = 15 }else{ siz = 22 } }else if((UserDefaults.standard.value(forKey: "fontsize") as AnyObject).int32Value == 1){// besar if(isphone()){ siz = 17 }else{ siz = 26 } }else{ if(isphone()){ siz = 15 }else{ siz = 22 } } break } return CGFloat(siz) } func getnametag(){ } class func isphone() ->Bool { if(UIDevice.current.userInterfaceIdiom == UIUserInterfaceIdiom.phone){ return true }else{ return false } } // example singleton swift class var shanetworkingInstance: sizeFont { struct Static { static var onceToken: Int = 0 static var instance: sizeFont? = nil } _ = sizeFont.__once return Static.instance! } } 

El código de línea roja es Static.instance = sizeFont ().

No estoy seguro de por qué obtengo esto, ¿alguien más lo sabe?

Static se declara dentro de la variable de class, que causa la inalcanzabilidad de todo el mundo fuera de la statement de var, solo muévelo al exterior.

 ... struct Static { static var onceToken: Int = 0 static var instance: sizeFont? = nil } // example singleton swift class var shanetworkingInstance: sizeFont { _ = sizeFont.__once return Static.instance! } ...