Get values from CoreData in Swift - ios

Question

I am attempting to pull out and print two values from CoreData. One is speed, the other is degrees. However things don't go as planned. First up, here's part of the code:
// Start fetching from CoreData
request = NSFetchRequest(entityName: "WindData")
request.returnsObjectsAsFaults = false
results = context.executeFetchRequest(request, error: nil)
if results!.count > 0 {
for result: AnyObject in results! {
println(result)
println(result.speed)
println(result.degrees)
}
}
else {
println("No data")
}
When I simply print results I get the values:
<NSManagedObject: 0x7f944a734e80> (entity: WindData; id: 0xd000000000740000 <x-coredata://762EB8C2-DDCF-43F5-8DFC-FAB9A29532E1/WindData/p29> ; data: {
degrees = 190;
speed = 8; })
println(result.speed) writes in the consol: 2.34181e-38
and println(result.degrees) won't allow me to compile and tells me that AnyObject does not have a member named degrees (although it clearly does)
Sorry for any rookie mistakes, this is my first time posting on Stackoverflow.
Here is the full code:
//
// ViewController.swift
// KitesurfioApp
//
// Created by Lasse Kristensen on 24/10/14.
// Copyright (c) 2014 Lasse Kristensen. All rights reserved.
//
import UIKit
import CoreData
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Set logo in nav bar
navigationItem.titleView = UIImageView(image: UIImage(named: "logo"))
// Global save values
var appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
var context: NSManagedObjectContext = appDel.managedObjectContext!
// JSON Fetching
let urlPath = "http://api.openweathermap.org/data/2.5/weather?lat=55.564120&lon=12.568605"
let url = NSURL(string: urlPath)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithURL(url!, completionHandler: {data, response, error -> Void in
if (error != nil) {
println(error)
}
else {
// Delete old entries in CoreData
var request = NSFetchRequest(entityName: "WindData")
request.returnsObjectsAsFaults = false
var results = context.executeFetchRequest(request, error: nil)
for result in results! {
context.deleteObject(result as NSManagedObject)
context.save(nil)
}
// Start fetching JSON
let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
var item = jsonResult["wind"] as NSDictionary
var degrees:Int = item["deg"] as NSInteger
var speed:Float = item["speed"] as Float
// Start saving JSON
var newItem = NSEntityDescription.insertNewObjectForEntityForName("WindData", inManagedObjectContext: context) as NSManagedObject
var speedValue:NSNumber = speed as NSNumber
var degreesValue:NSNumber = degrees as NSNumber
newItem.setValue(speedValue, forKey: "speed")
newItem.setValue(degreesValue, forKey: "degrees")
context.save(nil)
}
})
task.resume()
// Start fetching from CoreData
var request = NSFetchRequest(entityName: "WindData")
request = NSFetchRequest(entityName: "WindData")
request.returnsObjectsAsFaults = false
var results = context.executeFetchRequest(request, error: nil)
if results!.count > 0 {
for result: AnyObject in results! as [WindData] {
println(result)
println(result.speed)
}
}
else {
println("No data")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

You need to cast the AnyObject to your class which have properties degree etc.AnyObject does not know about your class properties you need to downcast the array [AnyObject] to your class array
for result in results! as [NSManagedObject] {
println(result)
println(result.valueForKey("speed")!)
println(result.valueForKey("degrees")!)
}