ios - MKPolyline 边界MapRect 插入

Question

如何向 MKPolyline 的 boundingMapRect 添加插图以将其与 MKMapSnapshotter 一起使用？

    let polyLine = MKPolyline(coordinates:locations , count: locations.count)

    var region = MKCoordinateRegionForMapRect(polyLine.boundingMapRect)
    mapSnapshotOptions.region = region

    mapSnapshotOptions.scale = UIScreen.main.scale
    mapSnapshotOptions.size = imageViewRect.size

    mapSnapshotOptions.showsBuildings = true
    mapSnapshotOptions.showsPointsOfInterest = true

    let snapShotter = MKMapSnapshotter(options: mapSnapshotOptions)
    snapShotter.start { (snapshot, error) in
     //use snapshot
    }

Answer 1

您可以向该区域添加跨度，如下所示:

// This will add a 10% increase in the span.
var region = MKCoordinateRegion(polyLine.boundingMapRect)
region.span.latitudeDelta = 1.1
region.span.longitudeDelta = 1.1

编辑:

这也是一种替代方案:

let region = polyLine.boundingMapRect
map.setVisibleMapRect(region, edgePadding: UIEdgeInsets(top: 50.0, left: 50.0, bottom: 50.0, right: 50.0), animated: true)