swift - 尝试合并两个日期会导致应用程序崩溃

Question

我试图在数据库中的特定保存时间和特定日期(星期五)触发通知，如下所示，但每次我尝试保存新提醒时，它都会告诉我在展开可选值时意外发现 nil 我确信它包含数据并且它不是零，即使我尝试处理零，应用程序仍然崩溃，但是当我尝试在不组合日期的情况下触发通知时，如 localNotification.fireDate = Remembers.时间!应用程序没有崩溃并且工作得很好。

我猜问题出在combineDate函数中，我该如何解决这个问题？

   func combineDate(time: NSDate?) -> NSDate{

            let gregorianCalendar: NSCalendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!

            let time: NSDateComponents = gregorianCalendar.components([.Hour, .Minute, .Second], fromDate: time!)
            time.timeZone = NSTimeZone.systemTimeZone()
            let timeCombiner: NSDateComponents = NSDateComponents()
            timeCombiner.timeZone = NSTimeZone.systemTimeZone()
            timeCombiner.hour = time.hour
            timeCombiner.minute = time.minute
            timeCombiner.second = 00
             timeCombiner.weekday = 6
            let combinedDate: NSDate = gregorianCalendar.dateFromComponents(components3)!

            return combinedDate

    }


    func createLocalNotification(){

        let localNotification = UILocalNotification()

        localNotification.timeZone = NSTimeZone.systemTimeZone()
     localNotification.fireDate = combineDate(reminders.time!)

 localNotification.alertBody = reminders.name!

        UIApplication.sharedApplication().scheduleLocalNotification(localNotification)




    }

Answer 1

导致所有这些质量的原因仍然未知，但是我通过检查提醒托管对象是否不等于 nil 然后尝试触发通知来解决它

 func createLocalNotification(){

        let localNotification = UILocalNotification()

        localNotification.timeZone = NSTimeZone.systemTimeZone()
if reminder != nil{
     localNotification.fireDate = combineDate(reminders.time!)
}

 localNotification.alertBody = reminders.name!

        UIApplication.sharedApplication().scheduleLocalNotification(localNotification)




    }