Shadow generation too long

[axmav]

Hello!
I add ShadowView in my TableViewCell, but shadow generation is too long.
================================================================= Main Thread Checker: UI API called on a background thread: -[UIView layer] PID: 70222, TID: 17479263, Thread name: (none), Queue name: com.apple.root.utility-qos, QoS: 17 Backtrace: 4 ShadowView 0x000000010afb5e5d _T0So6UIViewC10ShadowViewE7asImageSo7UIImageCfg + 29 5 ShadowView 0x000000010afabf1d _T010ShadowViewAAC16createLayerImage33_9B9E92D7988F296C5B194A5602A768AFLLyyF + 61 6 ShadowView 0x000000010afabe96 _T010ShadowViewAAC06updateA0yyFyycfU_ + 150 7 ShadowView 0x000000010afabedc _T010ShadowViewAAC06updateA0yyFyycfU_TA + 12 8 ShadowView 0x000000010afacad9 _T0Ix_IyB_TR + 41 9 libdispatch.dylib 0x000000010f6f63f7 _dispatch_call_block_and_release + 12 10 libdispatch.dylib 0x000000010f6f743c _dispatch_client_callout + 8 11 libdispatch.dylib 0x000000010f703499 _dispatch_root_queue_drain + 1444 12 libdispatch.dylib 0x000000010f702e97 _dispatch_worker_thread3 + 132 13 libsystem_pthread.dylib 0x000000010fbba5a2 _pthread_wqthread + 1299 14 libsystem_pthread.dylib 0x000000010fbba07d start_wqthread + 13

[PierrePerrin]

Are you calling the shadow generation only on the main thread ?

[axmav]

@PierrePerrin yes in UITableViewCell awakeFromNib()