我有一个BarCodeScanner-viewController，可以从3个不同的视图调用它。我的应用程序还具有一个tabbarController。问题是，标签栏从两个viewController中隐藏，而第三个则始终显示tabbarController，而在cameraMode（barCodeScanner）中。

我试图在viewDidLoad（），viewDidAppear（）和viewWillAppear（）两者中都设置“ self.tabBarController？.tabBar.isHidden = true”，并在viewWillDisappear（）上将其更改为false

我还测试了将'scanner.hidesBottomBarWhenPushed = true'设置为无结果。

// working:
setUpBackButton(withTitle: NSLocalizedString("button_cancel",comment: ""))
        let scanner = BarCodeScanner()
        self.navigationController?.pushViewController(scanner,animated: true)
        scanner.callback = { result in
            // code with result
        }


// working: 
setUpBackButton()
        let scanner = BarCodeScanner()
        scanner.modalPresentationStyle = .overCurrentContext
        self.navigationController?.pushViewController(scanner,animated: true)
        scanner.callback = { result in
            // code with result
        }


// NOT WORKING (i.e. not hiding the tabbarController):
let scanner = BarCodeScanner()
        setupBackButton()
        scanner.modalPresentationStyle = .overCurrentContext
        self.navigationController?.pushViewController(scanner,animated: true)
        scanner.callback = { result in
            // code with result
        }

在第三个示例中，我也不会隐藏选项卡。