Drawing a circle on mapkit

Question

我必须在地图上画一个圆，它必须以一个点为中心约1.8英里。我该怎么做？

Answer 1

Basically you need to do 2 steps:

1. Create MKCircle object using circleWithCenterCoordinate:radius: method and add it to your mapView (using addOverlay: method)
2. In mapView delegate implement mapView:viewForOverlay: method, create and setup MKCircleView instance there and return it

If you have different overlay types you may need to perform some type-checks in delegate method to create overlay views appropriate for each type of overlay.