exxbrain edited a comment on issue #530: iOS: "UI API called on a background 
thread" and plugin is VERY slow to initialise
URL: 
https://github.com/apache/cordova-plugin-camera/issues/530#issuecomment-577229486
 
 
   Hello, why is it closed? The problem is not fixed yet. 
   As I see the pull request is still not merged...
   
https://github.com/ryaa/cordova-plugin-camera/commit/a998ef45d902b514fc1dea53ebb24439034ac108
   
   ```
   Main Thread Checker: UI API called on a background thread: 
-[UIImagePickerController setSourceType:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90a48 +[CDVCameraPicker 
createFromPictureOptions:] + 200
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   ...
   2020-01-22 17:59:59.131966+0300 [7288:2296174] [reports] Main Thread 
Checker: UI API called on a background thread: -[UIImagePickerController 
setSourceType:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90a48 +[CDVCameraPicker 
createFromPictureOptions:] + 200
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   ...
   =================================================================
   Main Thread Checker: UI API called on a background thread: 
-[UIImagePickerController setAllowsEditing:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90a84 +[CDVCameraPicker 
createFromPictureOptions:] + 260
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   7   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + ...
   2020-01-22 17:59:59.213461+0300 Correqts[7288:2296174] [reports] Main Thread 
Checker: UI API called on a background thread: -[UIImagePickerController 
setAllowsEditing:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90a84 +[CDVCameraPicker 
createFromPictureOptions:] + 260
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   7   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 7008
   8   TCC                                 0x00000001b767ab28 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 23336
   ....
   =================================================================
   Main Thread Checker: UI API called on a background thread: 
-[UIImagePickerController sourceType]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90a9c +[CDVCameraPicker 
createFromPictureOptions:] + 284
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   7   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 7008
   8   TCC                                 0x00000001b767ab28 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + ....
   2020-01-22 17:59:59.262280+0300 [7288:2296174] [reports] Main Thread 
Checker: UI API called on a background thread: -[UIImagePickerController 
sourceType]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90a9c +[CDVCameraPicker 
createFromPictureOptions:] + 284
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   ....
   =================================================================
   Main Thread Checker: UI API called on a background thread: 
-[UIImagePickerController setMediaTypes:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90b08 +[CDVCameraPicker 
createFromPictureOptions:] + 392
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   7   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 7008
   8   TCC                                 0x00000001b767ab28 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 23336
   ...
   2020-01-22 17:59:59.310221+0300 Correqts[7288:2296174] [reports] Main Thread 
Checker: UI API called on a background thread: -[UIImagePickerController 
setMediaTypes:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90b08 +[CDVCameraPicker 
createFromPictureOptions:] + 392
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   7   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 7008
   8   TCC                                 0x00000001b767ab28 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 23336
   ...
   =================================================================
   Main Thread Checker: UI API called on a background thread: 
-[UIImagePickerController setCameraDevice:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90b48 +[CDVCameraPicker 
createFromPictureOptions:] + 456
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   7   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 7008
   8   TCC                                 0x00000001b767ab28 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 23336
   9   libxpc.dylib                        0x00000001b104ec84 
D263F3EB-967C-33B9-AF70-D48644FA8411 + 97412
   10  libxpc.dylib                        0x00000001b1042f18 
D263F3EB-967C-33B9-AF70-D48644FA8411 + 48920
   11  libdispatch.dylib                   0x00000001060a6c58 
_dispatch_client_callout3 + 16
   12  libdispatch.dylib                   0x00000001060c229c 
_dispatch_mach_msg_async_reply_invoke + 388
   13  libdispatch.dylib                   0x00000001060b903c 
_dispatch_kevent_worker_thread + 1376
   14  libsystem_pthread.dylib             0x00000001b1192bc0 _pthread_wqthread 
+ 332
   15  libsystem_pthread.dylib             0x00000001b1195760 start_wqthread + 8
   2020-01-22 17:59:59.350378+0300 Correqts[7288:2296174] [reports] Main Thread 
Checker: UI API called on a background thread: -[UIImagePickerController 
setCameraDevice:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d90b48 +[CDVCameraPicker 
createFromPictureOptions:] + 456
   5   Correqts                            0x0000000104d8acb8 -[CDVCamera 
showCameraPicker:withOptions:] + 108
   6   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   ...
   =================================================================
   Main Thread Checker: UI API called on a background thread: 
-[UINavigationController setDelegate:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d8ad0c -[CDVCamera 
showCameraPicker:withOptions:] + 192
   5   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   6   TCC                                 0x00000001b7676b60 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 7008
   7   TCC                                 0x00000001b767ab28 
B49C034E-858E-3F03-BA88-BB8BD0A811C1 + 23336
   8   libxpc.dylib                        0x00000001b104ec84 
D263F3EB-967C-33B9-AF70-D48644FA8411 + 97412
   9   libxpc.dylib                        0x00000001b1042f18 
D263F3EB-967C-33B9-AF70-D48644FA8411 + 48920
   10  libdispatch.dylib                   0x00000001060a6c58 
_dispatch_client_callout3 + 16
   11  libdispatch.dylib                   0x00000001060c229c 
_dispatch_mach_msg_async_reply_invoke + 388
   12  libdispatch.dylib                   0x00000001060b903c 
_dispatch_kevent_worker_thread + 1376
   13  libsystem_pthread.dylib             0x00000001b1192bc0 _pthread_wqthread 
+ 332
   14  libsystem_pthread.dylib             0x00000001b1195760 start_wqthread + 8
   2020-01-22 17:59:59.390398+0300 Correqts[7288:2296174] [reports] Main Thread 
Checker: UI API called on a background thread: -[UINavigationController 
setDelegate:]
   PID: 7288, TID: 2296174, Thread name: (none), Queue name: 
com.apple.root.default-qos, QoS: 0
   Backtrace:
   4   Correqts                            0x0000000104d8ad0c -[CDVCamera 
showCameraPicker:withOptions:] + 192
   5   Correqts                            0x0000000104d8a318 __25-[CDVCamera 
takePicture:]_block_invoke_2 + 336
   ```

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