Weex NavigationBar hides the sliding top and shows it?

question:
weex has a very strange problem under ios, that is, setting a hidden navigationbar, in ViewController will not display on the phone, but when the top position is slid down, the navigationbar will show up? Are there any students who encounter such a problem? How can it not be displayed, and it is useless to set it in the code?

the ios code is as follows:

[self.navigationController setNavigationBarHidden:YES animated:animated];

Environment:
Weex SDK 0.18

Mar.09,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3abbf-2ba84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3abbf-2ba84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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