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POApp crashed on iOS 7 for Map functionality developed using MKAnnotation, CGBitmapContextCreate and NSOperationQueue
 

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  1. POApp crashed on iOS 7 for Map functionality developed using MKAnnotation, CGBitmapContextCreate and NSOperationQueue
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    <p>Our App has Map and GPS based location tracking functionality. This app is already uploaded on Apple Store. The App contains following feature:</p> <ul> <li>Map Shows real-time traffic data Shows real-time traffic event (Accident, Traffic Jam etc.)</li> <li><p>User’s GPS location tracking The application runs fine for the iOS versions 5 and 6. We are facing following crashing issue for iOS 7 Beta while operating Map functionality in the app. We have used the following features of iOS to render the traffic data and traffic event on Map:</p></li> <li><p>MKAnnotation to render the traffic event</p></li> <li><p>To render the traffic data, app is using the CGBitmapContextCreate function.</p> <pre><code>context = CGBitmapContextCreate (NULL, self.mapView.frame.size.width, self.mapView.frame.size.height, 8,// bits per component bitmapBytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast); CGContextSetAllowsAntialiasing (context,YES) </code></pre></li> <li><p>Draw the line to display the traffic data on the Bitmap context.</p></li> <li><p>Created bitmap context will be displayed on map using the MKAnnotation API.</p></li> <li><p>App uses the NSOperationQueue to render the traffic and event data because the user interaction with map is smooth. Following is the snippet of the code:</p> <pre><code> [queue addOperationWithBlock:^{ [Set the required data], [Update the UI] }]; </code></pre></li> </ul> <p>Following are two crash logs which gets generated while random operation n of the Map functionality.</p> <p><strong>Crash Log - 1</strong></p> <p>Incident</p> <pre><code>Identifier: 471EAE21-E118-4E3D-AAAE-D7D82B1D6326 CrashReporter Key: bdbf75eb30240449214769478f38830aa7a14f7f Hardware Model: iPhone5,2 Process: {Application Name} [246] Path: /var/mobile/Applications/4FA0A7F2-4998-4F8F-A4C6-66D849D074B8/{Application Name}.app/{Application Name} Identifier: {Application bunald name} Version: X.X.X.X Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2013-08-30 14:21:24.523 +0530 OS Version: iOS 7.0 (11A4449d) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x8000000c Triggered by Thread: 0 Thread 0 Crashed: 0 libobjc.A.dylib 0x38ed3b66 objc_msgSend + 6 1 CoreFoundation 0x2ede773c -[__NSSetM removeObject:] + 92 2 MapKit 0x3002de96 -[MKAnnotationManager _removeRepresentationForAnnotation:fromCull:] + 490 3 MapKit 0x3004bc54 -[MKAnnotationManager _removeAnnotation:updateVisible:removeFromContainer:] + 272 4 MapKit 0x3004bb38 -[MKAnnotationManager removeAnnotation:] + 24 5 SLIM 0x00165828 -[TravelStarViewController mapView:viewForAnnotation:] (TravelStarViewController.m:1735) 6 MapKit 0x3005ea86 -[MKMapView annotationManager:representationForAnnotation:] + 74 7 MapKit 0x3002a136 -[MKAnnotationManager _addRepresentationForAnnotation:] + 362 8 MapKit 0x30028c4a -[MKAnnotationManager updateVisibleAnnotations] + 1034 9 Foundation 0x2f876358 __NSFireTimer + 60 10 CoreFoundation 0x2ee7ae84 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 12 11 CoreFoundation 0x2ee7aa9e __CFRunLoopDoTimer + 790 12 CoreFoundation 0x2ee78e26 __CFRunLoopRun + 1214 13 CoreFoundation 0x2ede353c CFRunLoopRunSpecific + 520 14 CoreFoundation 0x2ede331e CFRunLoopRunInMode + 102 15 GraphicsServices 0x3387733e GSEventRunModal + 134 16 UIKit 0x313fc7b0 UIApplicationMain + 1132 17 SLIM 0x000f3fa6 main (main.m:15) 18 SLIM 0x000f3efc start + 36 </code></pre>
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      1. USViktor Radchenko
 

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