'invalid context 0x0' after Migration to iOS 9

objective-c logging ios9 xcode7 crashlytics
Mikhail picture Mikhail · Sep 12, 2015 · Viewed 8.1k times · Source

I've migrated the app to iOS 9, and it works as usually, but there three log messages:

<Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextRestoreGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

Maybe helps that the next message from Crashlytics is: 

[Crashlytics:Crash] Warning: iOS 9 workaround for binary image loading issue in place.

Does anybody know how to fix it?

Answer

Radu Vlad picture Radu Vlad · Sep 14, 2015

This happens when there is a definition of UIViewControllerBasedStatusBarAppearance with false in info.plist.

If you don't need this you can set the key <key>UIViewControllerBasedStatusBarAppearance</key> to true in the file manually or change View controller-based status bar appearance option from Info to YES.

Also, I saw some posts that state there is no problem with this. As far as I know there's no way to set UIViewControllerBasedStatusBarAppearance from code, so I guess we'll have to wait until Apple will fix this issue. You can find more here.

Later Edit: It seems that iOS 9.1 solves this encountered errors. From last stable Xcode, running on iOS 9.1 result in no errors, while 9.0 still has the problems above.

Related questions

Where is Logfile stored using cocoaLumberjack

I am Using cocoaLumberjack logging framework for iOS logging. For storing logs in a file I used this code. DDFileLogger* fileLogger = [[DDFileLogger alloc] init]; fileLogger.rollingFrequency = 60 * 60 * 24; fileLogger.logFileManager.maximumNumberOfLogFiles = 7; [DDLog addLogger:fileLogger]; DDLogVerbose(@"hello"); NSLog(@"hihihihihi"); I am unable to …

Read More
Difference between NSLog and DLog

Can anyone tell me what the difference is between NSLog and DLog? I found about this DLog when I was looking over this project code: http://code.google.com/p/iphone-socks-proxy/

Read More
Google analytics 3.08 IOS idfa class missing, won't collect idfa

I downloaded google analytics and i followed their instructions how to implement analytics in application. But whatever i tried i get this log in xcode: idfa class missing, won't collect idfa. So i google it and found that apple will …

Read More