iOS 13 报错:[Assert] Unsupported use of UIKit view-customization API off the main thread

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2021-05-11 15:36:38.174462+0800 App-Beta[1141:430280] [Assert] Unsupported use of UIKit view-customization API off the main thread. -setBackgroundColor: sent to <UIPickerTableView: 0x105ab2800; frame = (31 -37.6667; 103 291); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x2811fc4b0>; layer = <CALayer: 0x281e0ed60>; contentOffset: {0, 0}; contentSize: {0, 0}; adjustedContentInset: {0, 0, 291, 0}; dataSource: (null)>
2021-05-11 15:36:38.175889+0800 App-Beta[1141:430280] [Assert] Unsupported use of UIKit view-customization API off the main thread. -_setBackgroundEffects: sent to <UIPickerTableView: 0x105ab2800; frame = (31 -37.6667; 103 291); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x2811fc4b0>; layer = <CALayer: 0x281e0ed60>; contentOffset: {0, 0}; contentSize: {0, 0}; adjustedContentInset: {0, 0, 291, 0}; dataSource: (null)>
2021-05-11 15:36:38.176338+0800 App-Beta[1141:430280] [Assert] Unsupported use of UIKit view-customization API off the main thread. -setSeparatorColor: sent to <UIPickerTableView: 0x105ab2800; frame = (31 -37.6667; 103 291); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x2811fc4b0>; layer = <CALayer: 0x281e0ed60>; contentOffset: {0, 0}; contentSize: {0, 0}; adjustedContentInset: {0, 0, 291, 0}; dataSource: (null)>
2021-05-11 15:36:38.177102+0800 App-Beta[1141:430280] [Assert] Unsupported use of UIKit view-customization API off the main thread. -setSeparatorStyle: sent to <UIPickerTableView: 0x105ab2800; frame = (31 -37.6667; 103 291); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x2811fc4b0>; layer = <CALayer: 0x281e0ed60>; contentOffset: {0, 0}; contentSize: {0, 0}; adjustedContentInset: {0, 0, 291, 0}; dataSource: (null)>
...
2021-05-11 15:36:38.257101+0800 App-Beta[1141:430280] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread.'
...

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DispatchQueue.main.async {
// Update UI
}

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dispatch_async(dispatch_get_main_queue(){
// code here
})

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dispatch_async(dispatch_get_main_queue(), ^{
// code here
});