从地图Xcode上删除折线

Question

我正在实施一个iPhone应用程序.我有一个地图和对象数组,其中包含要在地图上绘制的坐标.并且在这些点之间绘制折线.所以我想知道如何删除这条折线.不显示/隐藏,但删除.

这是我如何绘制它的代码

int pointCount = [routeLatitudes count]/2; // routeLatitudes是包含坐标纬度后跟经度的数组.

    MKMapPoint* pointArr = malloc(sizeof(MKMapPoint) * pointCount);

    int pointArrIndex = 0;  
    for (int idx = 0; idx < [routeLatitudes count]; idx=idx+2)
    {
        CLLocationCoordinate2D workingCoordinate;       
        workingCoordinate.latitude=[[routeLatitudes objectAtIndex:idx] doubleValue];
        workingCoordinate.longitude=[[routeLatitudes objectAtIndex:idx+1] doubleValue];  
        MKMapPoint point = MKMapPointForCoordinate(workingCoordinate);
        pointArr[pointArrIndex] = point;
        pointArrIndex++;
    }   

    // create the polyline based on the array of points. 
    routeLine = [MKPolyline polylineWithPoints:pointArr count:pointCount];

    [mapView addOverlay:routeLine];
    free(pointArr);  

并显示/隐藏折线我创建了一个参考MKOverlayView*overlayView = nil;

overlayView.hidden =假/真;

现在我需要知道如何删除/删除绘制的折线.

预先感谢.

Answer 1

试试这个

 [mapView removeOverlays:mapView.overlays];