4
當我的ViewController獲取釋放時,我的應用崩潰,而我的CATiledLayer正在檢索要在後臺線程中繪製的圖像。我得到一個消息CATiledLayer drawLayer:inContext:崩潰當視圖被釋放而正在檢索要繪製的圖像
-[MyViewController respondsToSelector:]: message sent to deallocated instance 0x8f58e00
和調試器顯示
0 ___forwarding___
1 __forwarding_prep_0__
2 -[CATiledLayer(CATiledLayerPrivate) canDrawRect:levelOfDetail:]
3 tiled_layer_render
4 CAImageProviderThread
5 CAImageProviderBackgroundThread
6 CA::DispatchGroup::thread
7 thread_fun
8 _pthread_start
現在,我想釋放MyViewController的某些實例,因爲我不需要它了。但是,當它從後臺線程返回時,我該如何阻止它崩潰?