After I set the backgroundImage for the backButton Image, it will disappear.
But when I clicked it once time, it will appear again.
UIImage *barBackBtnImg = [[UIImage imageNamed:@"btn_back"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
[self.navigationController.navigationBar setBackIndicatorImage:barBackBtnImg];
[self.navigationController.navigationBar setBackIndicatorTransitionMaskImage:barBackBtnImg];
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