iOS 13：@objc VC.navigationController（_：willShow：animated :)：违反线程：预期主线程 [英] iOS 13: @objc VC.navigationController(_:willShow:animated:) : threading violation: expected the main thread

问题描述

当隐藏特定ViewController的NavigationBar时，我仅在iOS 13用户上遇到了Crashlytics of Fabric崩溃的情况。

I got the crash on Crashlytics of Fabric only for iOS 13 users when the NavigationBar of the particular ViewController is being hidden.

我尝试通过隐藏特定的NavigationBar的方法使用NavigationController的委托方法的ViewController

I tried by hiding the NavigationBar for particular ViewController by using NavigationController's delegate method

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

但它也会在称为crashp的crashlytics上产生崩溃

But it also generating the crash on crashlytics called

Fatal Exception: NSInternalInconsistencyException

threading violation: expected the main thread

推荐答案

I得到了上述问题的解决方案，

I got a solution for the above issue,

我使用Xcode 10.2.1上传了应用程序的版本，但现在没有崩溃。

I used Xcode 10.2.1 to upload the build of the app, and I didn't get any crashes now.

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