缩放MKMapView以适应Swift中的折线点

Question

我一直在寻找一种解决方案来缩放MapView以适应Swift中MKPolyline的边界。我已经能够找到Objective-C here on SO的示例代码，但我完全不熟悉Objective-C或者如何将它转换为Swift。

有没有人在Swift中有这样的例子？感谢。

-(void)zoomToPolyLine: (MKMapView*)map polyline: (MKPolyline*)polyline animated: (BOOL)animated
{
[map setVisibleMapRect:[polyline boundingMapRect] edgePadding:UIEdgeInsetsMake(10.0, 10.0, 10.0, 10.0) animated:animated];
}

Answer 1

此代码将区域设置为显示整条折线，每边都有12.5％的填充。

        var regionRect = myPolyline.boundingMapRect


        var wPadding = regionRect.size.width * 0.25
        var hPadding = regionRect.size.height * 0.25

        //Add padding to the region
        regionRect.size.width += wPadding
        regionRect.size.height += hPadding

        //Center the region on the line
        regionRect.origin.x -= wPadding / 2
        regionRect.origin.y -= hPadding / 2

        myMapView.setRegion(MKCoordinateRegionForMapRect(regionRect), animated: true)

如果您不想填充，只需执行此操作

        var regionRect = myPolyline.boundingMapRect
        myMapView.setRegion(MKCoordinateRegionForMapRect(regionRect), animated: true)

Answer 2

func zoomToPolyLine(map : MKMapView, polyLine : MKPolyline, animated : Bool)
{
 map.setRegion(MKCoordinateRegionForMapRect(polyLine.boundingMapRect), animated: animated)
 }

Answer 3

在计算出方向后，将其写在下面的代码行中。以下代码对我有用。

//this code is used to fit two points polyline in mapview
  let newDistance = CLLocation(latitude: pickupCoordinate.latitude, longitude: pickupCoordinate.longitude).distance(from: CLLocation(latitude: destinationCoordinate.latitude, longitude: destinationCoordinate.longitude))
  let region = MKCoordinateRegion(center: pickupCoordinate, latitudinalMeters: 2 * newDistance, longitudinalMeters: 2 * newDistance)
  let adjustRegion = self.mapView.regionThatFits(region)
  self.mapView.setRegion(adjustRegion, animated:true)

屏幕截图如下。

希望这会有所帮助。