这将如何从 Obj-C 转换为 Swift？

Question

我正在尝试在 swift 中重写一个目前在 Objective-C 中的应用程序。我如何将这一行更改为 Swift，因为我当前的尝试未证明是正确的

Tabata *tabata = [notification object];

这是整个函数：

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

        default:
            break;
    }
}
}

这是我转换成的 Swift:

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 中你必须向下转型 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
        }
    }
}

希望对您有所帮助！

这将如何从 Obj-C 转换为 Swift？

How would this be converted from Obj-C to Swift?

objective-c

swift

xcode6

ios8