如何在两个坐标内显示地图？

Question

我想显示两个坐标之间的地图。我已使用此代码显示包含两个坐标的地图矩形。但是我的两个坐标都没有显示，而是显示了两个坐标之间的区域，不包括坐标。 我应该怎么做才能包括我的两个坐标？

    let coordinate1 = CLLocationCoordinate2DMake(28.53, 77.39)
    let coordinate2 = CLLocationCoordinate2DMake(29.13,76.69)
    // convert them to MKMapPoint
    let p1 = MKMapPointForCoordinate (coordinate2);
    let p2 = MKMapPointForCoordinate (coordinate1);

    let mapRect = MKMapRectMake(fmin(p1.x,p2.x), fmin(p1.y,p2.y), fabs(p1.x-p2.x), fabs(p1.y-p2.y));
    mapView.setVisibleMapRect(mapRect, animated: true)

Answer 1

基本上这是由于自动布局。我们应该使用mapViewDidFinishLoadingMap(mapView: MKMapView)方法来设置它。

func mapViewDidFinishLoadingMap(mapView: MKMapView) {
    // this is where visible maprect should be set
    let coordinate1 = CLLocationCoordinate2DMake(28.53, 77.39)
    let coordinate2 = CLLocationCoordinate2DMake(29.13,76.69)
    // convert them to MKMapPoint
    let p1 = MKMapPointForCoordinate (coordinate2);
    let p2 = MKMapPointForCoordinate (coordinate1);

    let mapRect = MKMapRectMake(fmin(p1.x,p2.x), fmin(p1.y,p2.y), fabs(p1.x-p2.x), fabs(p1.y-p2.y));
    mapView.setVisibleMapRect(mapRect, animated: true)
}

Answer 2

你可以试试下面的函数，它使通过的点在地图中居中：

func centerLocationInMapView(centerPoint: CLLocationCoordinate2D) {
    floatForRadiusInMiles = 10.0 // you can ignore this i have taken this for my custom radius property
    var scalingFactor: Double = abs((cos(2 * M_PI * centerPoint.latitude / 360.0)))
    var coordinateSpan: MKCoordinateSpan = MKCoordinateSpanMake(floatForRadiusInMiles / 69.0, floatForRadiusInMiles / (scalingFactor * 69.0))
    var coordinateRegion: MKCoordinateRegion = MKCoordinateRegionMake(centerPoint, coordinateSpan)
    self.mapViewForHomeScreen.scrollEnabled = true
    mapViewForHomeScreen.setRegion(coordinateRegion, animated: TRUE)
    mapViewForHomeScreen.regionThatFits(coordinateRegion)
}

调用这个函数

self.centerLocationInMapView( (first latitude + second latitude)/2 , (first longitude + second longitude)/2 )

在两个纬度，经度之间传递中心点，以便中心成为地图 中心！