计算两个日期之间的差异。斯威夫特 1.2

Question

我需要一种方法来确定在完成矿石的“未知”时间之后的时间。

启动计时器后，它需要计算何时发送本地通知。 我需要一种方法，以便应用程序可以完全关闭并仍然通知他们。

谢谢

这是我在实现“notificationsAllowed”代码时遇到的错误。

Answer 1

要计算结束时间，您可以使用

timerEndTime = NSDate(timeIntervalSinceNow:NSTimeInterval(oreWanted * 11))

所以你得到一个NSDate 对象。现在您可以在计算出的时间触发UILocalNotification：

注意：您需要在应用启动时请求通知权限。我在这里用notificationsAllowed 和soundsAllowed 简化了这一点，它们是我的AppDelegate 中的布尔变量。

let appDelegate = UIApplication.sharedApplication.delegate as! AppDelegate

if appDelegate.notificationsAllowed {
    let notification = UILocalNotification()
    notification.fireDate = timerEndTime
    notification.timeZone = NSTimeZone.defaultTimeZone()
    notification.alertBody = "Notification body text"
    notification.alertTitle = "Notification alert title"

    if appDelegate.soundsAllowed {
        notification.soundName = UILocalNotificationDefaultSoundName
    }

    UIApplication.sharedApplication().scheduleLocalNotification(notification)
}

---

编辑

在 AppDelegate 中为应用注册通知：

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    var notificationsAllowed = false
    var notificationSoundAllowed = false


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        let notificationSettings = UIUserNotificationSettings(forTypes: UIUserNotificationType.Sound | UIUserNotificationType.Alert, categories: nil)
        UIApplication.sharedApplication().registerUserNotificationSettings(notificationSettings)

        return true
    }

    func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) {
        if notificationSettings.types & UIUserNotificationType.Alert != nil {
            self.notificationsAllowed = true
        }

        if notificationSettings.types & UIUserNotificationType.Sound != nil {
            self.notificationSoundAllowed = true
        }
}