enable sendButton after didUpdateUserLocation

Yep/Base.lproj/Main.storyboard

@@ -194,6 +194,7 @@
                     </navigationItem>
                     <connections>
                         <outlet property="mapView" destination="N6L-U8-EFf" id="xfc-We-pFG"/>
+                        <outlet property="sendButton" destination="Dek-I8-RQb" id="pzq-pU-tOf"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="b42-ms-7Bt" userLabel="First Responder" sceneMemberID="firstResponder"/>

Yep/ViewControllers/PickLocation/PickLocationViewController.swift

@@ -11,7 +11,7 @@ import MapKit
 
 class PickLocationViewController: UIViewController {
 
-
+    @IBOutlet weak var sendButton: UIBarButtonItem!
     @IBOutlet weak var mapView: MKMapView!
 
     var isFirstShowUserLocation = true
@@ -22,6 +22,8 @@ class PickLocationViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
 
+        sendButton.enabled = false
+        
         mapView.showsUserLocation = true
         mapView.delegate = self
 
@@ -57,7 +59,6 @@ class PickLocationViewController: UIViewController {
         mapView.addAnnotation(pin)
 
         userPickedLocationPin = pin
-
     }
 }
 
@@ -68,6 +69,8 @@ extension PickLocationViewController: MKMapViewDelegate {
         if isFirstShowUserLocation {
             isFirstShowUserLocation = false
 
+            sendButton.enabled = true
+
             let location = userLocation.location
             let region = MKCoordinateRegionMakeWithDistance(location.coordinate, 2000, 2000)
             mapView.setRegion(region, animated: true)