MKMapViewDelegate: How to identifiy overlay in rendererForOverlay
来源： https://stackoverflow.com/questions/32348942/mkmapviewdelegate-how-to-identifiy-overlay-in-rendererforoverlay
mkoverlaypathrenderer
MKMapViewDelegate: How to identifiy overlay in rendererForOverlay
来源： https://stackoverflow.com/questions/32348942/mkmapviewdelegate-how-to-identifiy-overlay-in-rendererforoverlay
how to get visible overlays in MapKit? (i.e. MKOverlay/MKOverlayRender from a Mapkit Ivew)
问题 How does one get a list (array) of currently visible overlay from a MapkitView? Background - for example I want to show direction arrows to the center of certain Overlay types on my mapkitview, however how do I get the visible ones? There seems to be no way to do this I can see? So do I need to got through all overlays (actually ~8000) and do my own check to see what would be showing on the screen? Seems a waste if MapKit would have already effectively done this as part of deciding what
Adding MKOverlayPathRenderer as overlay to MKMapView gets exception
问题 Everything said in topic, so here is the code - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. _pathRenderer = [[MKOverlayPathRenderer alloc] init]; _pathRenderer.lineWidth = 8.0f; _pathRenderer.strokeColor = [UIColor redColor]; _pathRenderer.path = CGPathCreateMutable(); [_mapView addOverlay:_pathRenderer]; } At the last line it drops with exception: Terminating app due to uncaught exception 'NSInvalidArgumentException',
Adding MKOverlayPathRenderer as overlay to MKMapView gets exception
Everything said in topic, so here is the code - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. _pathRenderer = [[MKOverlayPathRenderer alloc] init]; _pathRenderer.lineWidth = 8.0f; _pathRenderer.strokeColor = [UIColor redColor]; _pathRenderer.path = CGPathCreateMutable(); [_mapView addOverlay:_pathRenderer]; } At the last line it drops with exception: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MKOverlayPathRenderer boundingMapRect]: unrecognized selector It means that i'm using wrong