iOS 13：@objc VC.navigationController（_：willShow：animated :)：违反线程：预期为主线程

Question

[当隐藏特定ViewController的NavigationBar时，仅iOS 13用户在Fabric Crashlytics上崩溃。

我尝试通过使用NavigationController的委托方法为特定的ViewController隐藏NavigationBar的方式

func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
    let hide = (viewController is MyVC)
    navigationController.setNavigationBarHidden(hide, animated: animated)
}

但是它还会在称为crashlytics的崩溃上产生崩溃>

Fatal Exception: NSInternalInconsistencyException

threading violation: expected the main thread

当隐藏特定ViewController的NavigationBar时，仅iOS 13用户在Crashlytics of Fabric上崩溃。我尝试通过隐藏NavigationBar来进行特定的操作...

Answer 1

隐藏在主线程上

Answer 2

您是否从后台线程调用navigationController.setNavigationBarHidden？