[swift] IOS地圖運用 (2) 在地圖釘上大頭針

承上一篇的Code我們繼續往下延伸,如何在地圖釘上大頭針呢?
首先我們把mapkit view的user location選項關閉,改成自己放上去的大頭針試試看

• 把程式修改如下,這邊主要著重在addPointAnnotation這個function ```swift
  import UIKit
  import CoreLocation
  import MapKit
  class MapViewController: UIViewController,CLLocationManagerDelegate {

    @IBOutlet weak var uimap: MKMapView!//地圖元件
  

  var location : CLLocationManager!; //座標管理元件
  override func viewDidLoad() {

    super.viewDidLoad();
  
        location = CLLocationManager();
    location.delegate = self;
    //詢問使用者是否同意給APP定位功能
    location.requestWhenInUseAuthorization();
    //開始接收目前位置資訊
    location.startUpdatingLocation();
    location.distanceFilter = CLLocationDistance(10); //表示移動10公尺再更新座標資訊
  

  }

    override func viewDidDisappear(animated: Bool) {
    //因為ＧＰＳ功能很耗電,所以被敬執行時關閉定位功能
    location.stopUpdatingLocation();
  

  }
  func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

    //取得目前的座標位置
    let c = locations[0] as CLLocation;
    let nowLocation = CLLocationCoordinate2D(latitude: c.coordinate.latitude, longitude: c.coordinate.longitude);
    //將map中心點定在目前所在的位置
    //span是地圖zoom in, zoom out的級距
    let _span:MKCoordinateSpan = MKCoordinateSpan(latitudeDelta: 0.0005, longitudeDelta: 0.0005);
    self.uimap.setRegion(MKCoordinateRegion(center: nowLocation, span: _span), animated: true);
    //加入座標
    addPointAnnotation(c.coordinate.latitude, longitude: c.coordinate.longitude);
  

  }
  //新增座標
  private func addPointAnnotation(latitude:CLLocationDegrees , longitude:CLLocationDegrees){

    //大頭針
    var point:MKPointAnnotation = MKPointAnnotation();
    //設定大頭針的座標位置
    point.coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude);
    point.title = "I'm here";
    point.subtitle = "緯度：\(latitude) 經度:\(longitude)";
    uimap.addAnnotation(point);
  

  }
  }

執行看看成果,點擊大頭貼可以看到剛剛設定的title與subtitle
[![](http://2.bp.blogspot.com/-sBszQR-gCvw/VPVRTFVx06I/AAAAAAAAEb8/wR8k2LQSLvI/s400/%E8%9E%A2%E5%B9%95%E5%BF%AB%E7%85%A7%2B2015-03-03%2B%E4%B8%8B%E5%8D%882.14.19.png)](http://2.bp.blogspot.com/-sBszQR-gCvw/VPVRTFVx06I/AAAAAAAAEb8/wR8k2LQSLvI/s1600/%E8%9E%A2%E5%B9%95%E5%BF%AB%E7%85%A7%2B2015-03-03%2B%E4%B8%8B%E5%8D%882.14.19.png)
*   那如果想將大頭針變色呢?
首先先將view controller繼承MKMapViewDelegate,並將mapview kit delegate指定為自己這個veiew controller ```swift
uimap.delegate = self;

• 接著override mapview的viewForAnnotation事件 ```swift
  func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
  var pointView : MKPinAnnotationView? = mapView.dequeueReusableAnnotationViewWithIdentifier(“CustomerPoint”) as?MKPinAnnotationView;
  if(pointView == nil){

  pointView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "CustomerPoint");
  //因為已經改寫了Annotation View,所以要將canShowCallout改成true,否則點擊大頭針不會跑出來我們剛剛指定的title跟subtitle
  pointView?.canShowCallout = true;
  

  }
  pointView!.pinColor = MKPinAnnotationColor.Green;
  return pointView;
  }

```

• 結果如下
  
• 這邊應該看出來整個Annotation的顯示方式都可以透過viewForAnnotation這個事件來改寫,所以下一篇就來介紹如何客製化Annotation的View