无法及时安排本地通知在特定时间和日期触发

Question

I am trying to schedule a notification at a certain time in swift. My TimeString is a string that looks like 08:32 or 12:23. When I try to fire on this specific date and time, the notification only fires on the specific date however not the specific time. For instance if I change the year to 2016 it won't fire. If I change the month it won't fire. Yet regardless of what time I put in, if the date matches the current date, I am writing this on 1/28/2015, the notification fires regardless of time, In fact it fires as soon as I close the application as my code is in

func applicationDidEnterBackground(application: UIApplication) {
}

My code does compile so I don't think there is an error in my code.

Is there any way to fire a notification at a specific time and not just a date in swift, and if so how do I implement this.

            var timeString : String =  "2015-01-28 " + TimeString;
            println(timeString);

            let formatter = NSDateFormatter()
            formatter.dateFormat = "yyyy-MM-dd HH:mm"
            formatter.timeZone = NSTimeZone(abbreviation: "GMT");
            var date = formatter.dateFromString(timeString)



            var localNotification:UILocalNotification = UILocalNotification()
            localNotification.alertAction = "Block"
            localNotification.alertBody = block.description() + " Started";
            localNotification.fireDate = date
            UIApplication.sharedApplication().scheduleLocalNotification(localNotification)

Answer 1

Try using this approach to set your date:

let calendar = NSCalendar.currentCalendar()
    let calendarComponents = NSDateComponents()
    calendarComponents.hour = 8   //you can get you time components 
    calendarComponents.second = 0 //from your string rather than 
    calendarComponents.minute = 0 //using fixed values
    calendarComponents.day = 28
    calendarComponents.year = 2015
    calendarComponents.month = 1
    let dateToFire = calendar.dateFromComponents(calendarComponents)

It worked for me. Hope this helps. :)