pointCounts錯誤使用MKOverlay

我有自定義覆蓋問題。問題是我不能識別錯誤代碼，它發生隨機pointCounts錯誤使用MKOverlay

也許有人能夠幫助我在這個堆棧基本。什麼是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 
)

來源

2012-07-30 Marks app

錯誤的含義是您的覆蓋圖中有MKPolygonView。 MKPolygonView的polygon屬性設置爲MyRegionOverlay的實例。不幸的是，MyRegionOverlay不是MKPolygon的子類，因爲它應該是。因此，當pointCount消息發送到MyRegionOverlay時，會出現運行時錯誤「無法識別的選擇器」，因爲MyRegionOverlay顯然不響應pointCount。

來源

2012-07-30 00:53:44

pointCounts錯誤使用MKOverlay

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