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This gist uses MapKit to display a map on the user's screen (iOS). Then, one point is added to a map. When the button is clicked, another point is added to the map. The data is from Raleigh's open data on crime. This code is a work in progress. I wanted to see if I could get the data back, and then on a button click, add it to the map. As you ca…
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| // | |
| // ViewController.swift | |
| // RaleighCrime | |
| // | |
| // Created by David Curtis on 3/15/15. | |
| // Copyright (c) 2015 David Curtis. All rights reserved. | |
| // | |
| import UIKit | |
| import Foundation | |
| import MapKit | |
| import CoreLocation | |
| class ViewController: UIViewController, MKMapViewDelegate { | |
| @IBOutlet weak var mapView: MKMapView! | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| // Set starting point of map: downtown Raleigh | |
| var latitude:CLLocationDegrees = 35.779632 | |
| var longitude:CLLocationDegrees = -78.638094 | |
| // Zoom level | |
| var latDelta:CLLocationDegrees = 0.09 | |
| var longDelta:CLLocationDegrees = 0.09 | |
| var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta) | |
| var location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude) | |
| var region:MKCoordinateRegion = MKCoordinateRegionMake(location, span) | |
| mapView.setRegion(region, animated: true) | |
| var annotation = MKPointAnnotation() | |
| annotation.coordinate = location | |
| annotation.title = "Raleigh" | |
| annotation.subtitle = "Crime" | |
| mapView.addAnnotation(annotation) | |
| // var lat2:CLLocationDegrees = 35.779419 | |
| // var long2:CLLocationDegrees = -78.645497 | |
| // var location2:CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat2, long2) | |
| // var annotation2 = MKPointAnnotation() | |
| // annotation2.coordinate = location2 | |
| // mapView.addAnnotation(annotation2) | |
| } | |
| override func didReceiveMemoryWarning() { | |
| super.didReceiveMemoryWarning() | |
| // Dispose of any resources that can be recreated. | |
| } | |
| func retrieveJsonFromData(data: NSData) -> AnyObject?{ | |
| println("Hello") | |
| var error : NSError? | |
| let jsonObject : AnyObject? = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments, error: &error) | |
| if error == nil { | |
| println("Successfully deserialized") | |
| if jsonObject is NSDictionary{ | |
| let deserializedDictionary = jsonObject as NSDictionary | |
| println("Deserialized JSON Dictionary = \(deserializedDictionary)") | |
| } | |
| else if jsonObject is NSArray{ | |
| let deserialzedArray = jsonObject as NSArray | |
| // println("Deserialzed JSON Array = \(deserialzedArray[0])") | |
| return deserialzedArray | |
| } | |
| else{ | |
| println("None") | |
| } | |
| } else if error != nil { | |
| println("An error happened while deserializing JSON data") | |
| } | |
| return nil | |
| } | |
| @IBAction func buttonClick(sender: AnyObject) { | |
| var query = "lcr=81A" | |
| let url = NSURL(string: "https://data.raleighnc.gov/resource/csw9-dd5k.json?\(query)") | |
| let request = NSURLRequest(URL: url!) | |
| NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response, data, error) -> Void in | |
| let parsedObject: AnyObject? = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments, error: nil) | |
| var newData: AnyObject? = self.retrieveJsonFromData(data) | |
| var latitudes : [NSString] = [] | |
| var longitudes : [NSString] = [] | |
| var dataDictionary = newData? as NSArray | |
| var length = dataDictionary.count - 1 | |
| for index in 0...length { | |
| if var location = dataDictionary[index]["location"] as? NSDictionary{ | |
| latitudes.append(location["latitude"] as NSString) | |
| longitudes.append(location["longitude"] as NSString) | |
| } | |
| } | |
| var latDelta:CLLocationDegrees = 0.09 | |
| var longDelta:CLLocationDegrees = 0.09 | |
| var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta) | |
| var arrayLength = latitudes.count - 1 | |
| for index in 0...arrayLength { | |
| var newLat:CLLocationDegrees = latitudes[index].doubleValue | |
| var newLong:CLLocationDegrees = longitudes[index].doubleValue | |
| var newLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(newLat, newLong) | |
| var region:MKCoordinateRegion = MKCoordinateRegionMake(newLocation, span) | |
| self.mapView.setRegion(region, animated: true) | |
| var annotation = MKPointAnnotation() | |
| annotation.coordinate = newLocation | |
| annotation.title = "Raleigh" | |
| annotation.subtitle = "Crime" | |
| self.mapView.addAnnotation(annotation) | |
| } | |
| // need to add for loop for longitudes = same as latitudes | |
| // then add a loop to loop through the long/lat arrays and put points on map = magic | |
| // var lat3:CLLocationDegrees = latitudes[0].doubleValue | |
| // var long3:CLLocationDegrees = -78.638094 | |
| } | |
| } // end button click | |
| } | |
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