如何做一个委托，即NSUserNotificationCenterDelegate在swift？
它与obj-c没有什么不同。
首先，必须在类声明中指定协议，如下所示：
首先，必须在类声明中指定协议，如下所示：
class MyClass: NSUserNotificationCenterDelegate
实现将如下所示：
// NSUserNotificationCenterDelegate implementation
func userNotificationCenter(center: NSUserNotificationCenter,didDeliverNotification notification: NSUserNotification) {
//implementation
}
func userNotificationCenter(center: NSUserNotificationCenter,didActivateNotification notification: NSUserNotification) {
//implementation
}
func userNotificationCenter(center: NSUserNotificationCenter,shouldPresentNotification notification: NSUserNotification) -> Bool {
//implementation
return true
}
当然，你必须设置委托。例如：
NSUserNotificationCenter.defaultUserNotificationCenter().delegate = self;
