我一直很难弄清楚如何将映射图钉中的自定义变量传递给Swift中的另一个视图控制器。我知道在addAnnotation时可以传递坐标，标题和字幕。我想尝试传递一个自定义变量，但将其隐藏。有这样的事吗？在下面，我得到了用户的位置，进行了映射，在附近的几个位置添加了带有注释的大头针，这些注释进入了另一个视图控制器，并且仅传递了标题和副标题。任何见解都将不胜感激。
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
var mappedCity = String()
var mappedState = String()
var manager = CLLocationManager()
var annotation:MKAnnotation!
var error:NSError!
var pointAnnotation:MKPointAnnotation!
var pinAnnotationView:MKPinAnnotationView!
var selectedAnnotation: MKPointAnnotation!
private var mapChangedFromUserInteraction = false
@IBOutlet var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
self.mapView.delegate = self
self.navigationItem.titleView = searchController.searchBar
self.definesPresentationContext = true
if CLLocationManager.locationServicesEnabled(){
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
}
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userLocation:CLLocation = locations[0]
let latitude = userLocation.coordinate.latitude
let longitude = userLocation.coordinate.longitude
let latDelta:CLLocationDegrees = 0.05
let lonDelta:CLLocationDegrees = 0.05
let span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, lonDelta)
let location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(location, span)
self.mapView.setRegion(region, animated: true)
self.mapView.showsUserLocation = true
CLGeocoder().reverseGeocodeLocation(userLocation) { (placemarks, error) in
if (error != nil){
print(error)
}else {
if let p = placemarks?[0]{
let locality = p.locality ?? ""
let administrativeArea = p.administrativeArea ?? ""
self.mappedCity = String(locality)
self.mappedState = String(administrativeArea)
self.parseJSON("\(locality)", state: "\(administrativeArea)")
}
}
}
self.manager.stopUpdatingLocation()
}
func parseJSON(city: String, state: String){
let passedCity = city
let passedState = state
let escapedCity = passedCity.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!
let escapedState = passedState.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!
let url = NSURL(string:"http://www.API.com/api.php?city=\(escapedCity)&stateAbv=\(escapedState)")!
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithURL(url) { (items, response, error) -> Void in
if error != nil {
print(error)
}else {
if let items = items {
do {
let jsonResult = try NSJSONSerialization.JSONObjectWithData(items, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
if jsonResult.count > 0 {
if let datas = jsonResult["data"] as? NSArray{
for data in datas{
if let title = data["title"] as? String {
if let street = data["street"] as? String {
if let city = data["city"] as? String {
if let stateAbv = data["stateAbv"] as? String {
if let zip = data["zip"] as? String {
self.geoAddress("\(title)", street: "\(street)", city: "\(city)", state: "\(stateAbv)", zip: "\(zip)")
}
}
}
}
}
}
}
}
} catch{}
}
}
}
task.resume()
}
func geoAddress(title: String, street: String, city: String, state: String, zip: String){
let storeName = "\(title)"
let location = "\(street) \(city) \(state) \(zip)"
let geocoder = CLGeocoder();
geocoder.geocodeAddressString(location, completionHandler: {(placemarks: [CLPlacemark]?, error: NSError?) -> Void in
if (error != nil) {
print("Error \(error!)")
} else if let placemark = placemarks?[0] {
let coordinates:CLLocationCoordinate2D = placemark.location!.coordinate
let pointAnnotation:MKPointAnnotation = MKPointAnnotation()
pointAnnotation.coordinate = coordinates
pointAnnotation.title = storeName
pointAnnotation.subtitle = location
self.mapView.addAnnotation(pointAnnotation)
}
})
}
private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view: UIView = self.mapView.subviews[0] as UIView
// Look through gesture recognizers to determine whether this region change is from user interaction
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if( recognizer.state == UIGestureRecognizerState.Began || recognizer.state == UIGestureRecognizerState.Ended ) {
return true
}
}
}
return false
}
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
// user changed map region
}
}
func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
if (mapChangedFromUserInteraction) {
// user changed map region
let center = mapView.centerCoordinate
let mapLatitude = center.latitude
let mapLongitude = center.longitude
let locationmove = CLLocation(latitude: mapLatitude, longitude: mapLongitude)
CLGeocoder().reverseGeocodeLocation(locationmove) { (placemarks, error) in
if (error != nil){
print(error)
}else {
if let p = placemarks?[0]{
let locality = p.locality ?? ""
let administrativeArea = p.administrativeArea ?? ""
self.mappedCity = String(locality)
self.mappedState = String(administrativeArea)
self.parseJSON("\(locality)", state: "\(administrativeArea)")
}
}
}
}
}
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is MKUserLocation {
return nil
}
let reuseId = "pin"
var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
if pinView == nil {
pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
pinView?.animatesDrop = false
pinView?.canShowCallout = true
pinView?.draggable = true
pinView?.pinTintColor = UIColor.greenColor()
let rightButton: AnyObject! = UIButton(type: UIButtonType.DetailDisclosure)
pinView?.rightCalloutAccessoryView = rightButton as? UIView
}
else {
pinView?.annotation = annotation
}
return pinView
}
func mapView(mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
if control == view.rightCalloutAccessoryView {
selectedAnnotation = view.annotation as? MKPointAnnotation
performSegueWithIdentifier("Details", sender: self)
}
}
func mapView(mapView: MKMapView, annotationView view: MKAnnotationView, didChangeDragState newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
if newState == MKAnnotationViewDragState.Ending {
let droppedAt = view.annotation?.coordinate
print(droppedAt)
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "Details"){
let myDetails = segue.destinationViewController as! DetailViewController
myDetails.mytitle = selectedAnnotation.title
myDetails.mysubtitle = selectedAnnotation.subtitle
}
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
}
}
Subclass“ MKPointAnnotation”类，然后将custom property其添加到其中。
class MyAnnotation : MKPointAnnotation {
var customProperty : String?
}
并且您可以使用MyAnnotation代替MKPointAnnotation。像下面
let pointAnnotation:MyAnnotation = MyAnnotation()
pointAnnotation.coordinate = coordinates
pointAnnotation.title = storeName
pointAnnotation.subtitle = location
pointAnnotation.customProperty = "your value"
self.mapView.addAnnotation(pointAnnotation)
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