我可以在完成处理程序中保存值

Question

这是事情，我想将今天的步骤保存到completionHandler中的核心数据中。但是，当我加载这个值时，编译器显示它为零。任何解决方案

func fetchDataOfQuantityType(startDate: NSDate, endDate: NSDate, quantityType: HKQuantityType, completion:((NSArray, NSError!) -> Void)!) { 

    // initial a predicate with startDate and endDate 
    let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: endDate, options: HKQueryOptions.StrictStartDate) 

    // initialize a HKStatisticsQuery 
    let query: HKStatisticsQuery = HKStatisticsQuery(quantityType: quantityType, quantitySamplePredicate: predicate, options: HKStatisticsOptions.CumulativeSum, completionHandler: { (query, results, error) in 

     if error != nil { // if there is an error print it 
      println("there is a \(error) occur") 
      return 
     } 
     // Mark: - Saving the data in to Core data 

     var todaySteps = results.sumQuantity().doubleValueForUnit(HKUnit.countUnit()) 
     println("The totalstep for today is \(todaySteps)") 
      var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as AppDelegate) 
      var context: NSManagedObjectContext = appDel.managedObjectContext! 
      var newUser = NSEntityDescription.insertNewObjectForEntityForName("User", inManagedObjectContext: context) as NSManagedObject 
      newUser.setValue(todaySteps, forKey: "todaysteps") 
      }) 
    self.healthstore.executeQuery(query) 
} 

Answer 1

这看起来像你没有保存上下文。尝试

var error: NSError? 
context.save(&error) 

设置值后。