相关疑难解决方法(0)

我有经度和经度,我想打开我的地图应用程序.我从这里试过这段代码.

    func goToMap(){

    var lat1 : NSString = self.venueLat
    var lng1 : NSString = self.venueLng

    var latitude:CLLocationDegrees =  lat1.doubleValue
    var longitude:CLLocationDegrees =  lng1.doubleValue

    var coordinate = CLLocationCoordinate2DMake(latitude, longitude)

    var placemark : MKPlacemark = MKPlacemark(coordinate: coordinate, addressDictionary:nil)

    var mapItem:MKMapItem = MKMapItem(placemark: placemark)

    mapItem.name = "Target location"

    let launchOptions:NSDictionary = NSDictionary(object: MKLaunchOptionsDirectionsModeDriving, forKey: MKLaunchOptionsDirectionsModeKey)

    var currentLocationMapItem:MKMapItem = MKMapItem.mapItemForCurrentLocation()

    MKMapItem.openMapsWithItems([currentLocationMapItem, mapItem], launchOptions: launchOptions)

}

此功能可以成功打开地图,但不会显示任何图钉.它还显示了我不想要的用户位置.我只想在地图上找到所提供纬度和经度的图钉.

正如标题所述,我想通过按下按钮在我自己的应用程序中打开ios设备中的本机地图应用程序.目前我使用了一个MKmapview显示一个简单的引脚,从json文件中取出lat/long .

代码是这样的:

- (void)viewDidLoad {
    [super viewDidLoad]; 
}


// We are delegate for map view
self.mapView.delegate = self;

// Set title
self.title = self.location.title;

// set texts...
self.placeLabel.text = self.location.place;


self.telephoneLabel.text = self.location.telephone;
self.urlLabel.text = self.location.url;


**// Make a map annotation for a pin from the longitude/latitude points
MapAnnotation *mapPoint = [[MapAnnotation alloc] init];
mapPoint.coordinate = CLLocationCoordinate2DMake([self.location.latitude doubleValue], [self.location.longitude doubleValue]);
mapPoint.title = self.location.title;**

// Add it to the map view
[self.mapView addAnnotation:mapPoint];

// Zoom to …