iOS slide back to the VC that hides the navigation bar, the navigation bar flashes once

VCA: is a page that hides the navigation bar; VCA sets the navigation bar hidden in the Viewwillappear life cycle function:

// Hide Navigation bar  = YES;

VCB: is a normal page that does not hide the navigation bar;

VCA---"The VCB process in the viewwilldisappear periodic function of the VCA set the navigation bar to drive the picture hidden, and the navigation bar to open the slide back.

// Show navigation Bar
[Self.navigationcontroller Setnavigationbarhidden:no Animated:yes];

When there is no

iOS slide back to the VC that hides the navigation bar, the navigation bar flashes once