Question

我有以下代码，但它没有显示位置。

import Foundation
import UIKit    
import MapKit    
import CoreLocation

class ViewTwo : UIViewController {

 @IBOutlet var Map: MKMapView!

 override func didReceiveMemoryWarning() {
    super.viewDidLoad()
    var location = CLLocationCoordinate2DMake(51.385493, 6.741528)
    var span = MKCoordinateSpanMake(0.2, 0.2)
    var region = MKCoordinateRegion(center: location , span: span)
    Map.setRegion(region, animated: true)

    var annotation =  MKPointAnnotation()
    annotation.coordinate = location
    annotation.title = "hi"
    annotation.coordinate = location
    Map.addAnnotation(annotation)
 }

感谢您的帮助。

Answer 1

这里可能有几件事情：

将代码从那里移到 view 事件，例如viewDidLoad，viewDidAppear或viewWillAppear。我将向您展示第一个示例：

override func viewDidLoad() {
    super.viewDidLoad()
    var location = CLLocationCoordinate2DMake(51.385493, 6.741528)
    var span = MKCoordinateSpanMake(0.2, 0.2)
    var region = MKCoordinateRegion(center: location , span: span)
    Map.setRegion(region, animated: true)
    var annotation =  MKPointAnnotation()
    annotation.coordinate = location
    annotation.title = "hi"
    annotation.coordinate = location
    Map.addAnnotation(annotation)
}

如果您想访问用户位置，请小心，在这种情况下，您必须通过locationManager请求它并将正确的字符串添加到.plist文件中
最后，成为一名优秀的 SO 公民，并将积分给予任何给出正确答案的人，或者至少评论一下，如果这些答案都不正确（即使是这一点）。< / p>

Answer 2

试试这个

self.Map.setCamera(camera, animated: true)

Answer 3

如前所述，您正在使用didReceiveMemoryWarning（），您希望将其放在viewDidLoad（）中，以便在加载视图时调用代码。

import Foundation
import UIKit    
import MapKit    
import CoreLocation

class ViewTwo : UIViewController {

 @IBOutlet var Map: MKMapView!

 override func viewDidLoad() {
  super.viewDidLoad()
  var location = CLLocationCoordinate2DMake(51.385493, 6.741528)
  var span = MKCoordinateSpanMake(0.2, 0.2)
  var region = MKCoordinateRegion(center: location , span: span)
  Map.setRegion(region, animated: true)

  var annotation =  MKPointAnnotation()
  annotation.coordinate = location
  annotation.title = "hi"
  annotation.coordinate = location
  Map.addAnnotation(annotation)
 }

Swift Map工具包注释

3 个答案: