各位大神，求助点击高德地图添加 MACircle不显示的问题～～

各位大神，我是IOS开发新手，今天在做高德地图点击添加MACircle的案例时，发现圆不出来。。rendererForOverlay也不执行。MAMapViewDelegate接口已经在.m里面加上去了，各位帮帮忙不胜感激//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];
}