title: Convert NSTimInterval to Integer Swift
body: <p>I need to convert a variable of type NSTimeInterval, which I know is a Double, to an Integer. I have already tried the solutions here: <a href="https://stackoverflow.com/questions/11121459/how-to-convert-nstimeinterval-to-int">How to convert NSTimeInterval to int?</a> , with no success. Can anyone give any suggestions on how to do this in Swift?
  Below is my function:</p>
  
  <pre><code>func getHKQuantityData(sampleType: HKSampleType, timeUnit: NSCalendarUnit, startDate: NSDate, endDate: NSDate, completion: (Void -&gt; Void)) -&gt; [(NSDate, Double)] {
      var startTime = 0
      var endTime = 0
      var repeat: NSTimeInterval
      var returnValue: [(NSDate, Double)] = []
      var queryType: String = ""
      var predicate: NSPredicate!
      let timeInterval = endDate.timeIntervalSinceDate(startDate)
      switch sampleType {
      case HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount):
          queryType = "step"
      case HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierHeight):
          queryType = "height"
      case HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierBodyMass):
          queryType = "weight"
      case HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierBodyMassIndex):
          queryType = "bmi"
      default:
          println("No recognized type")
      }
  
      switch timeInterval {
      // 1. Case for seconds
      case 0...59:
          predicate = HKQuery.predicateForSamplesWithStartDate(NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitSecond, value: startTime, toDate: NSDate(), options: nil), endDate: NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitSecond, value: startTime, toDate: NSDate(), options: nil), options: .None)
          repeat = timeInterval
      // 2. Case for minutes
      case 61...3599:
          predicate = HKQuery.predicateForSamplesWithStartDate(NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitMinute, value: startTime, toDate: NSDate(), options: nil), endDate: NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitMinute, value: startTime, toDate: NSDate(), options: nil), options: .None)
          repeat = round(timeInterval / 60)
      // 3. Case for Hours
      case 3600...86399:
          predicate = HKQuery.predicateForSamplesWithStartDate(NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitHour, value: startTime, toDate: NSDate(), options: nil), endDate: NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitHour, value: startTime, toDate: NSDate(), options: nil), options: .None)
          repeat = round(timeInterval / 3600)
      // 4. Default for Days
      default:
          predicate = HKQuery.predicateForSamplesWithStartDate(NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitDay, value: startTime, toDate: NSDate(), options: nil), endDate: NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitDay, value: startTime, toDate: NSDate(), options: nil), options: .None)
          repeat = round(timeInterval / 86400)
      }
      /*
      for x in 1...repeat {
  
      }
      */
  
  
      // Returns one data point for each timeUnit between startDate and endDate
      // array of tuples - (date, double)
  
      return returnValue
  }
  </code></pre>