I am a newbie and would be thankful for any help.
I want the latitude and longitude Value for my Poststring. But it shows that my response string is empty I want in the below long code in the line:
let postString = "latiTude=23&longiTude=12";
Put the Users Position. Now I have to put latiTude and longiTude manually, but I want replace it with the actual users location. I have no Idea how.
import Foundation
import CoreLocation
protocol FeedmodelProtocol: class {
func itemsDownloaded(items: NSArray)
}
class Feedmodel: NSObject, URLSessionDataDelegate, CLLocationManagerDelegate {
weak var delegate: FeedmodelProtocol!
let locationManager = CLLocationManager() // create Location Manager object
var latitude : Double?
var longitude : Double?
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location: CLLocationCoordinate2D = manager.location?.coordinate else { return }
// set the value of lat and long
latitude = location.latitude
longitude = location.longitude
}
func downloadItems() {
self.locationManager.requestAlwaysAuthorization()
// For use in foreground
// You will need to update your .plist file to request the authorization
self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
let myUrl = URL(string: "http://example.com/stock_service4.php");
let defaultSession = Foundation.URLSession(configuration: URLSessionConfiguration.default)
var request = URLRequest(url:myUrl!)
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
var postString = ""
if let lat = latitude, let long = longitude {
locationManager.stopUpdatingLocation()
postString = "lati=\(Int(lat))&longi=\(Int(long))"
// do task here now that postString is not empty
}
request.httpBody = postString.data(using: .utf8)
let task = defaultSession.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(String(describing: response))")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
}
task.resume()
}
func parseJSON(_ data:Data) {
var jsonResult = NSArray()
do{
jsonResult = try JSONSerialization.jsonObject(with: data, options:JSONSerialization.ReadingOptions.allowFragments) as! NSArray;
} catch let error as NSError {
print(error)
}
var jsonElement = NSDictionary()
let stocks = NSMutableArray()
for i in 0 ..< jsonResult.count
{
print(jsonResult)
jsonElement = jsonResult[i] as! NSDictionary
let stock = Stockmodel()
//the following insures none of the JsonElement values are nil through optional binding
if let Datum = jsonElement["Datum"] as? String,
let Tankstelle = jsonElement["Tankstelle"] as? String,
let Kraftstoff1 = jsonElement["Kraftstoff1"] as? String,
let Preis1 = jsonElement["Preis1"] as? String,
let Kraftstoff2 = jsonElement["Kraftstoff2"] as? String,
let Preis2 = jsonElement["Preis2"] as? String,
let Notiz = jsonElement["Notiz"] as? String,
let longitude = jsonElement["longitude"] as? String,
let latitude = jsonElement["latitude"] as? String
{
print (Datum)
print(Tankstelle)
print(Kraftstoff1)
print(Preis1)
print(Kraftstoff2)
print(Preis2)
print(Notiz)
print(longitude)
print(latitude)
stock.Datum = Datum
stock.Tankstelle = Tankstelle
stock.Kraftstoff1 = Kraftstoff1
stock.Preis1 = Preis1
stock.Kraftstoff2 = Kraftstoff2
stock.Preis2 = Preis2
stock.Notiz = Notiz
stock.longitude = longitude
stock.latitude = latitude
}
stocks.add(stock)
}
DispatchQueue.main.async(execute: { () -> Void in
self.delegate.itemsDownloaded(items: stocks)
})
}
}
And this is my php mysql file:
<?php
// Create connection
$con=mysqli_connect("......,......,......,.......");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$firstName= $_REQUEST['latiTude'];
$lastName = $_REQUEST['longiTude'];// Store values in an array
$returnValue = array($latiTude,$longiTude);
// Send back request in JSON format
// Select all of our stocks from table 'stock_tracker'
$sql ="SELECT m. *
, ( ACOS( COS( RADIANS( $latiTude) )
* COS( RADIANS( m.latitude ) )
* COS( RADIANS( m.longitude ) - RADIANS( $longiTude) )
+ SIN( RADIANS($Latitude) )
* SIN( RADIANS( m.Latitude) )
)
* 6371
) AS distance_in_km
FROM TankBilliger m
HAVING distance_in_km <= 100
ORDER BY distance_in_km ASC
LIMIT 100";
// Confirm there are results
if ($result = mysqli_query($con, $sql))
{
// We have results, create an array to hold the results
// and an array to hold the data
$resultArray = array();
$tempArray = array();
// Loop through each result
while($row = $result->fetch_object())
{
// Add each result into the results array
$tempArray = $row;
array_push($resultArray, $tempArray);
}
// Encode the array to JSON and output the results
echo json_encode($resultArray);
}
// Close connections
mysqli_close($con);
?>
Thank You!
First you need to import CoreLocation:
import CoreLocation
// and add CLLocationManagerDelegate to the class declaration
Then you need to declare the location manager and variables to hold the lat and long values:
// set these outside of any functions in your class
let locationManager = CLLocationManager() // create Location Manager object
var latitude : Double?
var longitude : Double?
After that is done you want to ask for authorization to use the location of the device. You will need to add the proper items ( NSLocationAlwaysUsageDescription, and/or NSLocationWhenInUseDescription I beleive) to your .plist file to do so.
// in the function you want to grab the user's location from
// Ask for Authorisation from the User.
self.locationManager.requestAlwaysAuthorization()
// For use in foreground
// You will need to update your .plist file to request the authorization
self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
Then you'll need to add the function to retrieve the location
// Add this function to your program
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location: CLLocationCoordinate2D = manager.location?.coordinate else { return }
// set the value of lat and long
latitude = location.latitude
longitude = location.longitude
}
After all of that you will be able to use the latitude and longitude variables whenever you want to. You will also want to tell the locationManager to stop updating the location after you get what you want like, locationManager.stopUpdatingLocation().
You can create the string like:
// in the function where you need the postString you can do this
var postString = ""
if let lat = latitude, let long = longitude {
locationManager.stopUpdatingLocation()
postString = "latiTude=\(lat)&longiTude=\(long)"
// do task here now that postString is not empty
}