我是新手，感谢您的帮助。
我想要Poststring的纬度和经度值。 但这表明我的响应字符串为空 我要在下面的长代码行中：
let postString = "latiTude=23&longiTude=12";
放置用户位置。现在我必须手动输入latiTude和longiTude， 但我想用实际的用户位置替换它。我不知道如何。
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)
})
}
}
这是我的php mysql文件：
<?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);
?>
谢谢！
答案 0 :(得分：1)
首先，您需要导入CoreLocation：
import CoreLocation
// and add CLLocationManagerDelegate to the class declaration
然后，您需要声明位置管理器和变量以保存lat和long值：
// set these outside of any functions in your class
let locationManager = CLLocationManager() // create Location Manager object
var latitude : Double?
var longitude : Double?
完成此操作后，您要请求授权才能使用设备的位置。您需要在.plist文件中添加正确的项目（NSLocationAlwaysUsageDescription和/或NSLocationWhenInUseDescription我相信）。
// 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()
}
然后，您需要添加功能以检索位置
// 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
}
所有这些之后，您将可以随时使用纬度和经度变量。您还会想要告诉locationManager在获得所需的locationManager.stopUpdatingLocation()之后停止更新位置。
您可以创建如下字符串：
// 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
}