Question

im using mkmapview to show route between current location and a coordinate. im using polyline to show the route. i have added annotation to start and destination. im using the following api to get the in between coordinates.

now if i change the coordinates the already existing route also is visible. how do i remove the existing route and add a new route? thanks in advance.

Answer 1

如果你已经计算和显示,那么,除非我没有在你询问中找到任何东西,否则,你们都需要做的是删除旧的一条,并添加新的一条。你的法典将看像什么。

// generating new data, do this however you like
MKPolyline *routeLine = [self generateNewRoutLine];
MyPinAnnotation *startPin = [self generateNewStartPin];
MyPinAnnotation *endPin = [self generateNewEndPin];

// removing old overlays and adding new
[myMapView removeOverlays:myMapView.overlays]; // removes all overlays
[myMapView removeAnnotations:myMapView.annotations]; // removes all pins
[myMapView addOverlay:routeLine];
[myMapView addAnnotations:[NSArray arrayWithObjects:startPin, endPin, nil]];

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