While a existing transition or presentation is occurring; The navigation stack won't be updated

PopToViewController:transition:called on < When using navigation for logical jump using Uialertcontroller hint information Uinavigationcontroller 0x7fc27b8ac000> while a existing transition or presentation is occurring; The navigation stack won't be updated. Error.

Cause: The dismiss operation cannot be done before the stack or stack operation is completed.

Workaround: Use the block callback to make a callback after the dismiss operation is completed, and execute the stack and stack in the callback.

While a existing transition or presentation is occurring; The navigation stack won't be updated