iOS Swift Local通知没有"弹出"

Question

我正在尝试在预定时间发送本地通知.但是通知没有出现在屏幕上,但是当我向下滑动时它会显示在通知中心.

这就是我想要实现的目标.这就是我所得到的.
       

这段代码来自我的AppDelegate的didFinishLaunchingWithOptions().

    // Setup local push notifications
    application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: [UIUserNotificationType.Alert, UIUserNotificationType.Badge, UIUserNotificationType.Sound], categories: nil))
    scheduleNotifications()

这是scheduleNotifications()的代码

func scheduleNotifications() {
    // create a corresponding local notification
    let notification = UILocalNotification()

    // Get today's date, time and year
    let calendar = NSCalendar.currentCalendar()
    let components = calendar.components([NSCalendarUnit.Day, NSCalendarUnit.Month, NSCalendarUnit.Year], fromDate: NSDate())
    // Sets the fire time to 2pm/1400 hours to anticipate user for lunch time
    components.hour = 19
    components.minute = 13
    components.second = 00

    notification.fireDate = components.date             // Sets the fire date
    notification.alertBody = "Enjoyed your lunch? Don't forget to track your expenses!"
    notification.alertAction = "Add expense"
    notification.repeatInterval = NSCalendarUnit.Day    // Repeats the notifications daily

    UIApplication.sharedApplication().scheduleLocalNotification(notification)
}

任何帮助,将不胜感激.谢谢!

Answer 1

您的问题是您将 NSDateComponents 对象转换为 NSDate 的方式。

简单地调用components.date而不calendar为NSDateComponents对象设置 a将返回nil。

尝试改用这个：

 notification.fireDate = calendar.dateFromComponents(components)

或者，您可以calendar在组件对象上设置属性：

components.calendar = calendar

因为您fireDate将通知对象上的属性设置为nil，它会立即触发，即在您有机会关闭应用程序并锁定屏幕之前。此行为记录在UILocalNotification 类参考中