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Editorial Team
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Asked: 2026-06-08T17:46:26+00:00

I have problem with custom overlay. The problem is I cant identify error code,

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I have problem with custom overlay. The problem is I cant identify error code, its occurs randomly

Maybe someone will be able to help me basic on this stack. What is pointCount?

2012-07-30 02:02:01.187 MyApp[454:8107] -[MyRegionOverlay pointCount]: unrecognized selector sent to instance 0x5d7dab0
2012-07-30 02:02:01.190 MyApp[454:8107] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MyRegionOverlay pointCount]: unrecognized selector sent to instance 0x5d7dab0'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x016c15a9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x01815313 objc_exception_throw + 44
    2   CoreFoundation                      0x016c30bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x01632966 ___forwarding___ + 966
    4   CoreFoundation                      0x01632522 _CF_forwarding_prep_0 + 50
    5   MapKit                              0x008186c4 _ZL20createPathForPolygonP9MKPolygon10MKMapPoint + 55
    6   MapKit                              0x00818817 -[MKPolygonView createPath] + 95
    7   MapKit                              0x0081d715 -[MKOverlayPathView drawMapRect:zoomScale:inContext:] + 79
    8   MapKit                              0x00838328 -[MKOverlayClusterView drawLayer:inContext:] + 1450
    9   QuartzCore                          0x00472b5e -[CALayer drawInContext:] + 143
    10  QuartzCore                          0x00489283 _ZL18tiled_layer_renderP16_CAImageProviderjjjjPv + 1648
    11  QuartzCore                          0x003d1eb2 _ZL21CAImageProviderThreadPjb + 475
    12  libSystem.B.dylib                   0x91bce781 _pthread_wqthread + 390
    13  libSystem.B.dylib                   0x91bce5c6 start_wqthread + 30
)
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1 Answer

  1. Editorial Team

    What the error means is that there is an MKPolygonView in your overlay. The polygon property of the MKPolygonView is set to an instance of MyRegionOverlay. Unfortunately MyRegionOverlay is not a subclass of MKPolygon as it is supposed to be. So when the pointCount message is sent to the MyRegionOverlay you get a run time error “unrecognized selector” since MyRegionOverlay apparently does not respond to pointCount.

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