在代碼結束時觸發的locationManager函數

Question

我試圖讓我的代碼獲取用戶的當前位置並將其發送到服務器。當我運行我的代碼時，似乎LocationManager函數僅在我的startload函數中的所有內容完成後纔會觸發。我試圖在之前將用戶的位置發送到服務器。

class ViewController: ..... 
    var currentLoc = "0" 
    [...] 
    func startload(place: String){ // Starts the process, send recording data and location to node 
      // GETS LOCATION 
      print(place) 
      locationManager.requestWhenInUseAuthorization() 
      locationManager.delegate = self 
      locationManager.desiredAccuracy = kCLLocationAccuracyBest 
      locationManager.requestLocation() 
      print("Just req location") 
      // GETS LOCATION 
      // SENDS REQUEST 
      // create the request & response 
      let request = NSMutableURLRequest(URL: NSURL(string: "https://4890adf2.ngrok.io/ios")!, cachePolicy: NSURLRequestCachePolicy.ReloadIgnoringLocalCacheData, timeoutInterval: 5) 
      var response: NSURLResponse? 

      // create some JSON data and configure the request 
      print("preping json") 
      let jsonString = "json={\"location\":\"\(currentLoc)\", \"Place\": \" \(place) \"}" 
      request.HTTPBody = jsonString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true) 
      request.HTTPMethod = "POST" 
      request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") 

      // send the request 
      print("Sending the request") 
      do{ 
       let data = try NSURLConnection.sendSynchronousRequest(request, returningResponse: &response) 
       let datastring = NSString(data: data, encoding:NSUTF8StringEncoding) 
       print("Datastring: \(datastring!)") 
      } catch let error { 
       print(error) 
      } 
      // look at the response 
      //print("The response: \(response)") 
      if let httpResponse = response as? NSHTTPURLResponse { 
       print("HTTP response: \(httpResponse.statusCode)") 
      } else { 
       print("No HTTP response") 
      } 
      // SENDS REQUEST 
     } 

     func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 
      print("Inside LocationManager") 
      if let location = locations.first { 
       currentLoc = String(location) 
      } else { 
       // ... 
      } 
     } 

     func locationManager(manager: CLLocationManager, didFailWithError error: NSError) { 
      print("Error finding location: \(error.localizedDescription)") 
     } 

我已經嘗試添加sleep()locationManager.requestLocation()後，看看，直到locationManager功能發射了我可以嘗試停止執行，但即使還在睡覺時，它不會觸發。

控制檯輸出看起來像：

First hit 
restaurant 
Just req location 
preping json 
Sending the request 
Datastring: HTTP 200 
HTTP response: 200 
Inside LocationManager 

Answer 1

我想你聽錯了。 LocationManager是一個異步API，一旦有事情可以告訴你，就可以在委託方法上進行回調。

不要連續編寫程序，因爲它會立即給你提供數據。

將您的代碼按照LocationManager的代碼對齊，並將您的服務器調用移動到didUpdateLocations API中。 請注意，根據位置更改多次調用此方法，因此，您可能需要仔細檢查要發送到服務器的時間和數據。