Passing Geolocation from Swift 2 ViewController to Javascript Method

Question

The code below is able to get the geolocation and prints it out. I got this based on some tutorials online and looking at Swift Documents. I want to pass geolocations in the form of Strings from Swift 2 to Javascript. I am able to get the GeoLocations, I do not know how to pass these Strings to my Javascript Code in the Webview.

Below is the Code I have:

@IBOutlet weak var Webview: UIWebView!

let locMgr = CLLocationManager()

override func viewDidLoad() {

    super.viewDidLoad()
    loadAddressURL()
    locMgr.desiredAccuracy = kCLLocationAccuracyBest
    locMgr.requestWhenInUseAuthorization()
    locMgr.startUpdatingLocation()
    locMgr.delegate = self //necessary



}

func locationManager(manager: CLLocationManager , didUpdateLocations locations: [CLLocation]){
    let myCurrentLoc = locations[locations.count-1]
    var myCurrentLocLat:String = "\(myCurrentLoc.coordinate.latitude)"
    var myCurrentLocLon:String = "\(myCurrentLoc.coordinate.longitude)"

    print(myCurrentLocLat)
    print(myCurrentLocLon)

    //pass to javascript here by calling setIOSNativeAppLocation

}

I have javascript on my website with this method:

function setIOSNativeAppLocation(lat , lon){

  nativeAppLat = lat;
  nativeAppLon = lon;
  alert(nativeAppLat);
  alert(nativeAppLon);

}

I have looked at another question labelled Pass variable from Swift to Javascript with the following solution:

func sendSomething(stringToSend : String) {
    appController?.evaluateInJavaScriptContext({ (context) -> Void in

       //Get a reference to the "myJSFunction" method that you've implemented in JavaScript
       let myJSFunction = evaluation.objectForKeyedSubscript("myJSFunction")

       //Call your JavaScript method with an array of arguments
       myJSFunction.callWithArguments([stringToSend])

       }, completion: { (evaluated) -> Void in
          print("we have completed: \(evaluated)")
    })
}

However I have no appDelegate, and I want to directly from this view make these changes. So I get a "use of unresolved identifier appDelegate".

Just a vague idea... Can you enable local storage in webview then set it and read it later from javascript? — PD81
– PD81, Commented Jul 14, 2016 at 2:49

Bhoomi Jagani · Accepted Answer · 2016-07-14 13:06:53Z

5

+50

You have to implement UIWebview delegate.Javascript function should call after webviewDidFinishLoad.

override func viewDidLoad() {
     super.viewDidLoad()
     // Do any additional setup after loading the view, typically from a nib.
     let url = NSURL (string: URLSTRING);
     let requestObj = NSURLRequest(URL: url!);
webView.delegate = self
    webView.loadRequest(requestObj);
  }

    func webViewDidFinishLoad(webView: UIWebView) {
            let javaScriptStr = "setIOSNativeAppLocation(\(myCurrentLoc.coordinate.latitude), \(myCurrentLoc.coordinate.longitude))"

            webView.stringByEvaluatingJavaScriptFromString(javaScriptStr)
        }

answered Jul 14, 2016 at 13:06

Bhoomi Jagani

2,41319 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Wain · Accepted Answer · 2016-07-14 08:56:49Z

4

The answer you link to is for Apple TV, which is very different to iOS & UIWebView.

Before you try to run any javascript you need to be sure that the web view has finished loading (see webViewDidFinishLoad).

When the web view is ready and you have your details you can create a String which contains the javascript you want to execute and then pass that to the web view:

let javaScript = "setIOSNativeAppLocation(\(myCurrentLoc.coordinate.latitude), \(myCurrentLoc.coordinate.longitude))"

webView.stringByEvaluatingJavaScriptFromString(javaScript)

answered Jul 14, 2016 at 8:56

Wain

119k15 gold badges132 silver badges152 bronze badges

Collectives™ on Stack Overflow

Passing Geolocation from Swift 2 ViewController to Javascript Method

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related