Ios 如何在委托函数中处理多个MKOverlays

我想要一个带有两个不同覆盖层的MKMapView

首先，我有一个“地图上的图像覆盖”（TileOverlay）， 第二，我想在地图上画一条路线

如果我在两个不同的项目（一个是图像覆盖，另一个是路线覆盖）中做这些事情，一切都会很好

现在，我想知道如果合并项目，viewForOverlay委托函数应该是什么样子

对于我的图像（平铺）覆盖，我当前的外观如下：

- (MKOverlayView *) mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{    
    TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
    tileView.tileAlpha = 1.0;
    return tileView;
}

- (MKOverlayView*)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
    polylineView.lineJoin = kCGLineJoinRound;
    polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
    return polylineView;
}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if ([overlay isKindOfClass:[MKPolyline class]]) {   

        MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
        polylineView.lineJoin = kCGLineJoinRound;
        polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
        return polylineView;

    } else {

        TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
        tileView.tileAlpha = 1.0;
        return tileView;
    }

-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖
{    
TileOverlayView*tileView=[[TileOverlayView alloc]INITWITHOVERLAYVIEW:overlay]；
tileView.tileAlpha=1.0；
返回tileView；
}

对于“我的路线覆盖”，它如下所示：

- (MKOverlayView *) mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{    
    TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
    tileView.tileAlpha = 1.0;
    return tileView;
}

- (MKOverlayView*)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
    polylineView.lineJoin = kCGLineJoinRound;
    polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
    return polylineView;
}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if ([overlay isKindOfClass:[MKPolyline class]]) {   

        MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
        polylineView.lineJoin = kCGLineJoinRound;
        polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
        return polylineView;

    } else {

        TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
        tileView.tileAlpha = 1.0;
        return tileView;
    }

-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖
{
MKPolylineView*polylineView=[[MKPolylineView alloc]initWithPolyline:overlay]；
polylineView.lineJoin=kCGLineJoinRound；
polylineView.strokeColor=[[UIColor blueColor]colorWithAlphaComponent:0.4]；
返回多段线视图；
}

现在，如果我想“合并”这些（到一个项目中），这个方法应该是什么样子

 - (MKOverlayView*)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{
    //what comes here?
}

-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖
{
//什么来了？
}

您可以通过首先检查传递到

mapView:viewForOverlay:

方法中的覆盖类型来处理这种情况，如下所示：

- (MKOverlayView *) mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{    
    TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
    tileView.tileAlpha = 1.0;
    return tileView;
}

- (MKOverlayView*)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
    polylineView.lineJoin = kCGLineJoinRound;
    polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
    return polylineView;
}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if ([overlay isKindOfClass:[MKPolyline class]]) {   

        MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
        polylineView.lineJoin = kCGLineJoinRound;
        polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
        return polylineView;

    } else {

        TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
        tileView.tileAlpha = 1.0;
        return tileView;
    }

-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖{
如果（[overlay iskindof类：[MKPolyline类]]）{
MKPolylineView*polylineView=[[MKPolylineView alloc]initWithPolyline:overlay]；
polylineView.lineJoin=kCGLineJoinRound；
polylineView.strokeColor=[[UIColor blueColor]colorWithAlphaComponent:0.4]；
返回多段线视图；
}否则{
TileOverlayView*tileView=[[TileOverlayView alloc]INITWITHOVERLAYVIEW:overlay]；
tileView.tileAlpha=1.0；
返回tileView；
}

您可以通过首先检查传递到

mapView:viewForOverlay:

方法中的覆盖类型来处理这种情况，如下所示：

- (MKOverlayView *) mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{    
    TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
    tileView.tileAlpha = 1.0;
    return tileView;
}

- (MKOverlayView*)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
    polylineView.lineJoin = kCGLineJoinRound;
    polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
    return polylineView;
}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if ([overlay isKindOfClass:[MKPolyline class]]) {   

        MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
        polylineView.lineJoin = kCGLineJoinRound;
        polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.4];
        return polylineView;

    } else {

        TileOverlayView *tileView = [[TileOverlayView alloc] initWithOverlay:overlay];
        tileView.tileAlpha = 1.0;
        return tileView;
    }

-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖{
如果（[overlay iskindof类：[MKPolyline类]]）{
MKPolylineView*polylineView=[[MKPolylineView alloc]initWithPolyline:overlay]；
polylineView.lineJoin=kCGLineJoinRound；
polylineView.strokeColor=[[UIColor blueColor]colorWithAlphaComponent:0.4]；
返回多段线视图；
}否则{
TileOverlayView*tileView=[[TileOverlayView alloc]INITWITHOVERLAYVIEW:overlay]；
tileView.tileAlpha=1.0；
返回tileView；
}

好的，谢谢，但是我应该返回什么？我不需要返回一个包含两个覆盖的MKOverlayView吗？或者如果它是类MKPolyline，我只需要返回polylineView，如果它是类tileView，我需要返回tileView吗？好的，谢谢，但是我应该返回什么？我不需要返回一个包含两个覆盖的MKOverlayView吗？？或者，如果polylineView是类MKPolyline，我就必须返回polylineView，如果它是类tileView，我就必须返回tileView？