UISwitch（）。setOn不起作用（似乎）

Question

这是uiswitch valueChange action

@IBAction func swichTouchIdState(sender: UISwitch) {
    print("newState:\(sender.on)")
    if sender.on == false {
        AuthenticationSetter.touchIdAuthentication() {
            isSuccess, error in
            if isSuccess == true {
                AuthenticationSetter.setAuthenticationSwitchUserDefault(false)
            } else {
                sender.setOn(true, animated: true)
            }
            if let laError = error as? LAError {
                print("error happened in authenticating: \(laError)")
                switch laError {
                case .AppCancel:
                    print("App Cancel")
                    self.touchIdSwitch.setOn(true, animated: true)
                    break
                case .SystemCancel:
                    print("System Cancel")
                    self.touchIdSwitch.setOn(true, animated: true)
                    break
                case .UserCancel:
                    print("User Cancel")
                    dispatch_async(dispatch_get_main_queue()) {
                        self.touchIdSwitch.setOn(true, animated: false)
                    }
                    break
                default:
                    break
                }
            } else {
                print("no error")
            }
        }
    } else {
        AuthenticationSetter.setAuthenticationSwitchUserDefault(true)
    }
}

这里是AuthenticationSetter.touchIdAuthentication函数

class func touchIdAuthentication(doAfterAuthentication: (Bool, NSError?) -> Void) {
    let laContext = LAContext()
    var error: NSError?

    if laContext.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &error) {
        laContext.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: "TouchID Authentication", reply: doAfterAuthentication)
    } else {
        print("device don't support touchId")
    }
}

当我在touchid窗口触摸取消时，会打印“用户取消”，但开关没有打开。

我创建了一个新的demoViewController，它有一个UISwitch和一个按钮

当调用按下此函数时：demoSwitch.setOn(demoSwitch.on, true)

它运行得很好!!!!任何ios大师都可以帮助我！