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让注释出现在地图上时遇到了一些麻烦。地址字符串是从前一个 ViewController 传入的。一切正常，直到将注释推送到地图。有什么建议么？

class PostViewController: UIViewController {
@IBOutlet weak var locationInput: UITextField!
@IBOutlet weak var debugText: UILabel!


@IBAction func postDirectionTouched(sender: AnyObject) {
    if locationInput.text!.isEmpty {
        debugText.text = "Location Input Empty."
    } else {
        nextSegue()
    }

}

func nextSegue() {
    dispatch_async(dispatch_get_main_queue(), {
        let controller = self.storyboard!.instantiateViewControllerWithIdentifier("LinkPostController") as! LinkPostViewController
        controller.address = self.locationInput.text!
        self.presentViewController(controller, animated: true, completion: nil)
    })
}

}

import UIKit
import CoreLocation
import AddressBook
import MapKit

class LinkPostViewController: UIViewController, MKMapViewDelegate {

@IBOutlet weak var pointMap: MKMapView!
@IBOutlet weak var linkInput: UITextField!
@IBOutlet weak var debugText: UILabel!
var address: String = ""
var coords: CLLocationCoordinate2D?

override func viewDidLoad() {
    super.viewDidLoad()

    self.mapLocation()

}

func mapLocation(){
    let geocoder = CLGeocoder()

    geocoder.geocodeAddressString(self.address, completionHandler: {(placemark, error) -> Void in
        if error != nil{
            print("Geocode failed with error: \(error!.localizedDescription)")
        } else if placemark!.count > 0 {
            let pm = placemark?[0]
            let location = pm!.location
            self.coords = location!.coordinate

            print(self.coords!)

            self.showMap()


        }

    })
}

func showMap() {
        print("last")
        let coordinates = self.coords
        let pinn = MKPointAnnotation()
        pinn.title = "hello"
        pinn.subtitle = "This my pin."
        pinn.coordinate = coordinates!



        dispatch_async(dispatch_get_main_queue()) {
            self.pointMap.addAnnotation(pinn)
        }
   }
func mapView(mapView: MKMapView, annotationView: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {}
}
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1 回答 1

1

最简单的工作示例，在澳大利亚添加注释：

import UIKit
import MapKit

class ViewController: UIViewController {

    // MARK: - Private variables

    private var mapView: MKMapView?

    // MARK: - UIViewController methods

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        mapView = MKMapView(frame: view.frame)
        view.addSubview(mapView!)
        let locationCoordinate = CLLocationCoordinate2DMake(-25.27, 133.775)
        let pointAnnotation = MKPointAnnotation()
        pointAnnotation.coordinate = locationCoordinate
        mapView?.addAnnotation(pointAnnotation)
    }
}

检查 placemark!.count > 0 （您的代码看起来正确）

于 2017-10-30T10:12:05.053 回答