Reputation: 42139
I am loading multiple MKPolylines
as overlays
onto an MKMapView
. I would like to be able to distinguish these some how so change things like color, line width, etc.
But, when viewForOverlay:
gets called, it sees all my MKPolylines
the same, which doesn't allow me to change any of them.
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {
if ([overlay isKindOfClass:[MKPolyline class]]) {
MKPolylineView *aView = [[[MKPolylineView alloc] initWithPolyline:(MKPolyline*)overlay] autorelease];
aView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.7];
MKZoomScale currentZoomScale = (CGFloat)(mapView.bounds.size.width / mapView.visibleMapRect.size.width);
aView.lineWidth = MKRoadWidthAtZoomScale(currentZoomScale);
return aView;
}
// Want to color my next overlay red
return nil;
}
How can I do this? Could I somehow attach tag to each MKPolyline
? Or, another, better way to do this?
Upvotes: 3
Views: 4332
Reputation: 1889
i'm using mkcircle as an example
MKCircle *circle = [MKCircle circleWithCenterCoordinate:currentPoint radius:radius];
[circle setTitle:@"circle1"];
[map addOverlay:circle];
- (MKOverlayView *)mapView:(MKMapView *)map viewForOverlay:(id <MKOverlay>)overlay
{
NSLog(@"overlay %@",overlay);
if ([[overlay title] isEqualToString:@"circle1"]){
circleView = [[MKCircleView alloc] initWithOverlay:overlay];
//circleView.strokeColor = [UIColor redColor];
circleView.fillColor = [[UIColor redColor] colorWithAlphaComponent:0.3];
return circleView;
}
}
Upvotes: 0
Reputation:
MKPolyline
inherits from MKShape
which has a settable title
(and subtitle
) property which you can use to tell them apart.
This answer has an example of how to use it with MKPolygon
objects.
If title
and subtitle
are not sufficient for your requirements, then you can subclass as Mundi commented.
Upvotes: 8
Reputation: 80265
MKPolyLine
is a subclass of could be subclassed to add a tag-like identifier. UIView
. Thus I would go with tags. This also makes it quite easy to refer to the lines when you need them (with viewWithTag
)
Upvotes: 0