虽然晚了，但还是希望能帮到别人.我在 viewDidAppear:animated 中使用了 Stephens 代码，导航栏在返回选项卡时保持不变.这使我可以在导航栏上方使用徽标.我在 viewController 中使用了它.

Although late, I hope this can still help someone else out. I used Stephens code inside viewDidAppear:animated and the navigation bar stays put upon traveling back to the tab. This allowed me to use a logo above the navigation bar. I used this inside my viewController.

    - (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.navigationController.view.frame = CGRectMake(0.0, 100.0, 320.0, 426.0); 
self.navigationController.navigationBar.frame = CGRectMake(0.0, 0.0, 320.0, 44.0); 
[self loadData];
    }