ios - CGContextSaveGState: invalid context 0x0 at App Launch -


i have set cg_context_show_backtrace environnement variable yes because had following error cgcontextsavegstate: invalid context 0x0.

the following stacktrace didn't me much. 

<error>: cgcontextsavegstate: invalid context 0x0. backtrace:       <-[uistatusbarbatteryitemview contentsimage]+773>        <-[uistatusbaritemview updatecontentsandwidth]+36>         <-[uistatusbaritemview initwithitem:data:actions:style:]+503>          <+[uistatusbaritemview createviewforitem:withdata:actions:foregroundstyle:]+159>           <-[uistatusbarlayoutmanager _createviewforitem:withdata:actions:]+168>            <-[uistatusbarlayoutmanager _prepareenableditemtype:withenableditems:withdata:actions:itemappearing:itemdisappearing:]+3             <-[uistatusbarlayoutmanager prepareenableditems:withdata:actions:]+108>              <-[uistatusbarforegroundview _setstatusbardata:actions:animated:]+951>               <-[uistatusbarforegroundview setstatusbardata:actions:animated:]+874>                <__51-[uistatusbar _preparetosetstyle:animation:forced:]_block_invoke+443>                 <+[uiview(animation) performwithoutanimation:]+82>                  <-[uistatusbar _preparetosetstyle:animation:forced:]+935>                   <-[uistatusbar _requeststyleattributes:animationparameters:forced:]+404>                    <-[uistatusbar requeststyle:animationparameters:forced:]+490>                     <-[uistatusbar requeststyle:animated:forced:]+113>                      <-[uistatusbar forceupdatestyleoverrides:]+97>                       <-[uistatusbar _evaluateserverregistration]+294>                        <-[uistatusbar didmovetosuperview]+33>                         <__45-[uiview(hierarchy) _postmovedfromsuperview:]_block_invoke+683>                          <-[uiview(hierarchy) _postmovedfromsuperview:]+484>                           <-[uiview(internal) _addsubview:positioned:relativeto:]+2305>                            <-[uiview(hierarchy) addsubview:]+56>                             <-[uistatusbarwindow setstatusbar:]+311>                              <-[uiapplication _createstatusbarwithrequestedstyle:orientation:hidden:]+384>                               <-[uiapplication _runwithmainscene:transitioncontext:completion:]+1047>                                <__84-[uiapplication _handleapplicationactivationwithscene:transitioncontext:completion:]_block_invo                                 <-[uiapplication workspacedidendtransaction:]+163>                                  <__37-[fbsworkspace clientendtransaction:]_block_invoke_2+71>                                   <__40-[fbsworkspace _performdelegatecallout:]_block_invoke+54>                                    <-[fbsserialqueue _performnext]+184>                                     <-[fbsserialqueue _performnextfromrunloopsource]+52>                                      <fbsserialqueuerunloopsourcehandler+33>                                       <__cfrunloop_is_calling_out_to_a_source0_perform_function__+15>                                        <__cfrunloopdosources0+523>                                         <__cfrunlooprun+1032>                                          <cfrunlooprunspecific+470>                                           <cfrunloopruninmode+123>                                            <-[uiapplication _run]+540>                                             <uiapplicationmain+160>                                              <main+94>

the error happening @ launch , there seems problem battery view. error ring bell ?

fww app written in swift 2.0, on ios9 xcode 7b6.

i have encountered same issue, , cause of was, playing around setting different status bar styles different screens. therefore , needed add "view controller-based status bar appearance" key inside plist. , warning goes away if remove key.


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