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你好我正在開發一個應用程序的ios和它的一個功能必須找到用戶的當前位置。這裏是我的代碼：如何在swift中查找用戶的位置？
import UIKit
import MapKit
import CoreLocation
import SwiftyJSON
struct City {
let name : String
let location : CLLocation
let description :String
let imageName : String
func distanceTo(location:CLLocation) -> Int
{
let distanceMeters = location.distanceFromLocation(self.location)
let distanceKilometers = distanceMeters/1000.00
return Int(round(100 * distanceKilometers)/100)
}
}
class FirstViewController: UIViewController, CLLocationManagerDelegate {
@IBOutlet weak var LabelTest: UILabel!
@IBOutlet weak var Slider: UISlider!
@IBOutlet weak var LabelValueSlider: UILabel!
var MySliderCurrentValue = Double()
var manager = CLLocationManager()
var userLoc: CLLocationCoordinate2D!
{
willSet{
self.orderCitysByProximity()
self.filterCitysByProximity(Int(self.Slider.value))
self.LocateMe(manager)
}
}
var cities = [City]()
var nearbyCities = [City]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let path: String = NSBundle.mainBundle().pathForResource("cities", ofType: "json") as String!
let jsonData = NSData(contentsOfFile: path) as NSData!
//let ReadableJSON = JSON (data:jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil)
do {
let jsonObject = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions.MutableContainers) as! [String:AnyObject]
for city in jsonObject["cities"] as! [[String:AnyObject]] {
//let coordinates = position["Position"] as! [String:CLLocationDegrees]
let cityName = city["Name"] as! String
let latitude = city["Latitude"] as! Double
let longitude = city["Longitude"] as! Double
let description = city["Description"] as! String
let image = city["Image"] as! String
let location = CLLocation(latitude: latitude, longitude: longitude)
let city = City(name: cityName, location: location,description: description, imageName: image)
cities.append(city)
// print(cities)
}
self.orderCitysByProximity()
self.filterCitysByProximity(Int(self.Slider.value))
} catch let error as NSError {
print(error)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func SliderChange(sender: UISlider) {
let MySliderCurrentValue: String = String(Int(sender.value))
LabelValueSlider.text = MySliderCurrentValue
self.filterCitysByProximity(Int(sender.value))
}
@IBAction func goToTableView()
{
if let tableViewController = self.storyboard?.instantiateViewControllerWithIdentifier("tableViewController") as? TableViewController
{
tableViewController.cities = self.nearbyCities
self.navigationController?.pushViewController(tableViewController, animated: true)
}
}
func filterCitysByProximity(kilometers:Int)
{
self.nearbyCities.removeAll()
for city in self.cities {
if(city.distanceTo(self.userLoc) <= kilometers*2)
{
self.nearbyCities.append(city)
}
}
self.LabelTest.text = "you have \(self.nearbyCities.count) cities nearby"
let OrderedArray = self.nearbyCities.sort({ $0.distanceTo(self.userLoc) < $1.distanceTo(self.userLoc) })
self.nearbyCities = OrderedArray
}
func orderCitysByProximity()
{
let OrderedArray = self.cities.sort({ $0.distanceTo(self.userLoc) < $1.distanceTo(self.userLoc) })
self.cities = OrderedArray
}
@IBAction func LocateMe(sender: AnyObject) {
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userlocation: CLLocation = locations[0] as CLLocation
manager.stopUpdatingLocation()
let location = CLLocationCoordinate2D(latitude: userlocation.coordinate.latitude, longitude: userlocation.coordinate.longitude)
self.userLoc = location
}
}
你將看到FUNC的LocationManager，在那裏我試圖找到用戶的當前位置的底部。您能否告訴我如何啓動此功能，以便應用程序識別何時輸入userLoc。 userLoc是用戶的協調，我必須在其他函數（如func filterCitysByProximity）中使用它們，剩下的部分可以在代碼中看到。
什麼問題？ – Dravidian