问题
My app currently has three tabs, a tab for pinning a location, and a detailView of the pinned location on the second tab. I am trying to save the location of the pin into NSUserdefaults. I would then like that location to stay pinned upon reloading the app, and therefore the detail view would still display the detail view of the pinned location. Here is what I have so far,
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
// Find location of user
var userLocation:CLLocation = locations[0] as! CLLocation
var latitude = userLocation.coordinate.latitude
var longitude = userLocation.coordinate.longitude
var latDelta:CLLocationDegrees = 0.01
var longDelta: CLLocationDegrees = 0.01
var span: MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
var location:MKUserLocation = currentLocation;
var region: MKCoordinateRegion = MKCoordinateRegionMake(location.coordinate, span)
var coordinate:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude);
carInitialLocation = userLocation;
let locationData = NSKeyedArchiver.archivedDataWithRootObject(carInitialLocation);
NSUserDefaults.standardUserDefaults().setObject(locationData, forKey: "locationData");
carInitialCoordinate = coordinate;
self.map.setRegion(region, animated: true);
}
override func viewDidLoad() {
super.viewDidLoad()
if let loadedData = NSUserDefaults.standardUserDefaults().dataForKey("locationData") {
if let loadedLocation = NSKeyedUnarchiver.unarchiveObjectWithData(loadedData) as? CLLocation {
println(loadedLocation.coordinate.latitude);
println(loadedLocation.coordinate.longitude);
var annotation = MKPointAnnotation()
annotation.coordinate = loadedLocation.coordinate
annotation.title = title
self.map.addAnnotation(annotation)
}
}
map.addAnnotations(artworks)
map.delegate = self;
manager.delegate = self;
manager.desiredAccuracy = kCLLocationAccuracyBest;
manager.requestWhenInUseAuthorization();
manager.startUpdatingLocation();
self.map.showsUserLocation = true;
currentLocation = map.userLocation;
}
I then want the pinLocation button to be deactivated once the user has pinned a location once. I try to do this as so:
@IBAction func pinLocationButton(sender: AnyObject) {
// add location to the array, so it can be retrieved and put it into temporary storage
//places.append(["name":title,"lat":"\(newCoordinate.latitude)","lon":"\(newCoordinate.longitude)"])
if let loadedData = NSUserDefaults.standardUserDefaults().dataForKey("locationData") {
if let loadedLocation = NSKeyedUnarchiver.unarchiveObjectWithData(loadedData) as? CLLocation {
println(loadedLocation.coordinate.latitude);
println(loadedLocation.coordinate.longitude);
pinLocationButton.enabled = false;
}
}
var location = carInitialLocation
var coordinate = carInitialCoordinate
CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: { (placemarks, error) -> Void in
var title = ""
if (error == nil) {
if let p = CLPlacemark(placemark: placemarks?[0] as! CLPlacemark) {
var subThoroughfare:String = ""
var thoroughfare:String = ""
if p.subThoroughfare != nil {
subThoroughfare = p.subThoroughfare
}
if p.thoroughfare != nil {
thoroughfare = p.thoroughfare
}
completeAddress = self.displayLocationInfo(p);
title = "\(subThoroughfare) \(thoroughfare)"
}
}
// annotation, i.e pins
var annotation = MKPointAnnotation()
annotation.coordinate = coordinate
annotation.title = title
self.map.addAnnotation(annotation)
// NSUserDefaults.standardUserDefaults().setObject(places, forKey: "places")
})
}
Then, in my detailVC I attempt to reverse geocode the pinned location, but it is defaulting to the current location.. which I don't understand why Here's the code:
super.viewDidLoad()
addressLabel.font = UIFont(name: addressLabel.font.fontName, size: 18)
smallMapView.delegate = self;
locationManager.delegate = self;
smallMapView.mapType = MKMapType.Hybrid;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.requestWhenInUseAuthorization();
locationManager.startUpdatingLocation();
smallMapView.zoomEnabled = true;
smallMapView.rotateEnabled = true;
if let loadedData = NSUserDefaults.standardUserDefaults().dataForKey("locationData") {
if let loadedLocation = NSKeyedUnarchiver.unarchiveObjectWithData(loadedData) as? CLLocation {
println(loadedLocation.coordinate.latitude);
println(loadedLocation.coordinate.longitude);
CLGeocoder().reverseGeocodeLocation(loadedLocation, completionHandler: { (placemarks, error) -> Void in
var title = "";
var subtitle = "";
var locality = "";
if(error == nil) {
if let placemark = CLPlacemark(placemark: placemarks?[0] as! CLPlacemark) {
var subThoroughfare:String = "";
var thoroughfare:String = "";
var locality:String = "";
var postalCode:String = "";
var administrativeArea:String = "";
var country:String = "";
if (placemark.subThoroughfare != nil) {
subThoroughfare = placemark.subThoroughfare;
}
if(placemark.thoroughfare != nil) {
thoroughfare = placemark.thoroughfare;
}
if(placemark.locality != nil) {
locality = placemark.locality;
}
if(placemark.postalCode != nil) {
postalCode = placemark.postalCode;
}
if(placemark.administrativeArea != nil) {
administrativeArea = placemark.administrativeArea;
}
if(placemark.country != nil) {
country = placemark.country;
}
println("viewcontroller placmark data:");
println(locality);
println(postalCode);
println(administrativeArea);
println(country);
title = " \(subThoroughfare) \(thoroughfare) \n \(locality), \(administrativeArea) \n \(postalCode) \(country)";
subtitle = " \(subThoroughfare) \(thoroughfare)";
println(title);
self.addressLabel.text = title;
}
}
var latitude = loadedLocation.coordinate.latitude;
var longitude = loadedLocation.coordinate.longitude;
var latDelta:CLLocationDegrees = 0.001;
var longDelta:CLLocationDegrees = 0.001;
var span: MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta);
var overallLoc = CLLocationCoordinate2DMake(latitude, longitude);
var region:MKCoordinateRegion = MKCoordinateRegionMake(overallLoc, span);
var annotation = MKPointAnnotation();
annotation.coordinate = loadedLocation.coordinate;
annotation.title = subtitle;
self.smallMapView.addAnnotation(annotation);
self.smallMapView.setRegion(region, animated: true)
})
}
}
}
回答1:
in the pinLocationButton function, you use the manager.location which is wrong, you should use
CLGeocoder().reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
var title = ""
if (error == nil) {
// ....
来源：https://stackoverflow.com/questions/31465870/storing-cllocation-and-keeping-annotation