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POOccasionally ios MKMapView Crashes when going to other screen and comeback to MapScreen
 

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    <p>In my IOS App I declared Map contained view controller as a shared instance.</p> <pre><code>Exception Type: EXC_BAD_ACCESS (SIG SEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000028 Crashed Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 VectorKit 0x37058b86 __64-[VKMapCanvas animateToMapRegion:pitch:yaw:duration:completion:]_block_invoke_0168 + 50 1 VectorKit 0x37003bee -[VKAnimation _stopAnimation:] + 38 2 VectorKit 0x36fcd4a8 -[VKAnimation onTimerFired:] + 48 3 VectorKit 0x36fcd2d0 -[VKMainLoop displayTimerFired:] + 352 4 QuartzCore 0x3ab6706c CA::Display::DisplayLink::dispatch(unsigned long long, unsigned long long) + 156 5 QuartzCore 0x3ab66fc4 CA::Display::IOMFBDisplayLink::callback(__ IOMobile Frame buffer*, unsigned long long, unsigned long long, unsigned long long, void*) + 60 6 IO Mobile Frame buffer 0x34609fd4 IO Mobile Frame buffer VsyncNotify Func + 152 7 IOKit 0x3b2f7446 IODispatchCalloutFromCFMessage + 190 8 CoreFoundation 0x33d1d5d8 __CFMachPortPerform + 116 9 CoreFoundation 0x33d28170 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32 10 CoreFoundation 0x33d28112 __CFRunLoopDoSource1 + 134 11 CoreFoundation 0x33d26f94 __CFRunLoopRun + 1380 12 CoreFoundation 0x33c99eb8 CFRunLoopRunSpecific + 352 13 CoreFoundation 0x33c99d44 CFRunLoopRunInMode + 100 14 GraphicsServices 0x3ba972e6 GSEventRunModal + 70 15 UIKit 0x3b5552f4 UIApplicationMain + 1116 16 DNA 0x000dd860 main (main.m:17) 17 DNA 0x000dd3dc start + 36 </code></pre> <p><strong>I am not using VKMapCanvas Framework</strong> but I am using Mapkit framework, when we keep moving and switching between view controllers it is crashing.For every 25 meters I am adding and removing the annotations, I searched in stackoverflow someone pointed out crashing because of annotations handling.I am unable to understand whether we are getting crash because of this.</p> <pre><code>-(void)getFieldTips:(id)response { if([response objectForKey:@"No Net"]){ } else{ [self removeTipAnnotations]; [fieldTipsMArray removeAllObjects]; fieldTipsMArray = [response objectForKey:@"data"]; if ([fieldTipsMArray count]) { [self addFieldtipsToRoute:fieldTipsMArray]; } } } - (void)removeTipAnnotations { NSMutableArray *locs = [[NSMutableArray alloc] init]; for (id &lt;MKAnnotation&gt; annot in [self.theMapView annotations]) { if ( [annot isKindOfClass:[ MKUserLocation class]] ) { } else if([annot.title isEqualToString:@"tip"]) { [locs addObject:annot]; } } [self.theMapView removeAnnotations:locs]; locs = nil; } - (void)addFieldtipsToRoute: (NSMutableArray *)fieldTipsMutableArray{ [fieldTipsMutableArray enumerateObjectsUsingBlock:^(id fieldTipsObjectFromService, NSUInteger fieldTipsIndex, BOOL *stop) { fieldTipsObjectFromService = [fieldTipsMArray objectAtIndex:fieldTipsIndex]; Annotation *ann = [[Annotation alloc] initWithLatitude:[[fieldTipsObjectFromService objectForKey:@"lat"] doubleValue] Longitude:[[fieldTipsObjectFromService objectForKey:@"lon"] doubleValue]]; ann.title = @"tip"; ann.tagForAnnotation = fieldTipsIndex; [self.theMapView addAnnotation:ann]; }]; } </code></pre> <p><strong>and Using below things for UserTracking</strong></p> <pre><code>[self.theMapView setUserTrackingMode:MKUserTrackingModeFollowWithHeading animated:YES]; - (void)mapView:(MKMapView *)mapView didChangeUserTrackingMode:(MKUserTrackingMode)mode animated:(BOOL)animated { dispatch_async(dispatch_get_main_queue(),^{ if ([CLLocationManager locationServicesEnabled]) { if ([CLLocationManager headingAvailable]) { [self.theMapView setUserTrackingMode:MKUserTrackingModeFollowWithHeading animated:NO]; }else{ [self.theMapView setUserTrackingMode:MKUserTrackingModeFollow animated:NO]; } }else{ [self.theMapView setUserTrackingMode:MKUserTrackingModeNone animated:NO]; } }); } </code></pre>
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