这将如何从Obj转换为Swift？

Question

我正在尝试重新编写一个应用程序，它目前在Objective中。我如何将这一行改为Swift，因为我目前的尝试不正确

Tabata *tabata = [notification object];

以下是整个功能：

- (void)stateChanged:(NSNotification*)notification
{
if (enabled)
{
    Tabata *tabata = [notification object];
    switch (tabata.getState) {
        case EXERCISE:
        case RELAXATION:
            [player play];
            break;

        default:
            break;
    }
}
}

以下是我转化为Swift的内容：

func stateChanged(notifcation: NSNotification) {
    if enabled {

        var tabata: Tabata! = notification.object //error "Use of unresolved identifier 'notification'"
        switch tabata.getState() {
        case .EXERCISE: fallthrough
        case .RELAXATION:
            player.play()
            break

        default:
            break

        }
    }
}

Answer 1

在Swift中，您必须向下转换AnyObject类型的对象，而不是声明类型

   var tabata = notification.object as! Tabata

Answer 2

func stateChanged(notification: NSNotification) {
    if(enabled) {
        var tabata: Tabata = notification.object as! Tabata
        switch tabata.getState() {
        case .EXERCISE:
            fallthrough
        case .RELAXATION:
            player.play()
            break
        default:
            break
        }
    }
}

希望这能有所帮助！