EXC_BAD_ACCESS与MKPinAnnotationView

我在iOS的mapView上显示MKPinAnnotationView时出现问题。 我得到这个错误，但我不明白错误来自哪里：“EXC_BAD_ACCESS”。 我的代码看起来不错：

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation { MKPinAnnotationView *pv = [[MKPinAnnotationView alloc] init]; [pv setPinColor:MKPinAnnotationColorGreen]; [pv setCanShowCallout:YES]; [pv setRightCalloutAccessoryView:[UIButton buttonWithType:UIButtonTypeDetailDisclosure]]; return pv; 

}

当我设置断点到应用程序，这里是我的控制台显示使用gdb：

  continue Current language: auto; currently objective-c Program received signal: “EXC_BAD_ACCESS”. (gdb) bt #0 0x023d1dfe in -[MKPinAnnotationView _setPinType:] () #1 0x0000324c in -[iSouvenirView mapView:viewForAnnotation:] (self=0x761abe0, _cmd=0x24221fd, mapView=0x7613410, annotation=0x761d360) at /Users/m2sar/iSouvenir/iSouvenirView.m:125 #2 0x02398130 in -[MKAnnotationContainerView _addViewForAnnotation:] () #3 0x02392b2a in -[MKAnnotationContainerView _addViewsForAnnotations:animated:] () #4 0x0238e657 in -[MKAnnotationContainerView showAddedAnnotationsAnimated:] () #5 0x0236837c in -[MKMapView _showAddedAnnotationsAndRouteAnimated:] () #6 0x02367cc8 in -[MKMapView mapTileViewDidFinishRendering:] () #7 0x023e7ae0 in -[MKMapTileView _didFinishRendering] () #8 0x000471c9 in __NSFireTimer () #9 0x025cff73 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ () #10 0x025d15b4 in __CFRunLoopDoTimer () #11 0x0252ddd9 in __CFRunLoopRun () #12 0x0252d350 in CFRunLoopRunSpecific () #13 0x0252d271 in CFRunLoopRunInMode () #14 0x0326000c in GSEventRunModal () #15 0x032600d1 in GSEventRun () #16 0x002bfaf2 in UIApplicationMain () #17 0x00002388 in main (argc=1, argv=0xbffff070) at /Users/m2sar/iSouvenir/main.m:14 (gdb) 

错误在代码的第二行。 任何build议？

谢谢你的帮助

Answer 1

您必须使用initWithAnnotation:reuseIdentifier:来初始化注解视图initWithAnnotation:reuseIdentifier: 例如：

 MKPinAnnotationView *pv = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annot"] autorelease]; 

但是，您还应该先通过调用dequeueReusableAnnotationViewWithIdentifier来利用注释视图的重用。

编辑：
在MKAnnotationView的文档中 ，标题为“重用注释视图”的段落解释了为什么您应该使用dequeueReusableAnnotationViewWithIdentifier 。 所以viewForAnnotation的代码如下所示：

 -(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation { static NSString *myAnnotationIdentifier = @"annot"; MKPinAnnotationView *pv = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:myAnnotationIdentifier]; if (!pv) { pv = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:myAnnotationIdentifier] autorelease]; [pv setPinColor:MKPinAnnotationColorGreen]; [pv setCanShowCallout:YES]; [pv setRightCalloutAccessoryView:[UIButton buttonWithType:UIButtonTypeDetailDisclosure]]; } else { //we're re-using an annotation view //update annotation property in case re-used view was for another pv.annotation = annotation; } return pv; } 

Answer 2

尝试：

 MKPinAnnotationView *pv = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil];