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//创建手势
UITapGestureRecognizer *mapTapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(mapTouchUpInside:)];
[mapView addGestureRecognizer:mapTapGestureRecognizer];
-(void) mapTouchUpInside:(UITapGestureRecognizer *)recognizer{
CLLocationCoordinate2D lCoord=[mapView convertPoint:[recognizer locationInView:mapView] toCoordinateFromView:mapView];
//构造圆
MACircle *circle = [MACircle circleWithCenterCoordinate:lCoord radius:100];
//在地图上添加圆
[mapView addOverlay: circle];
}