UIImagePickerController 的相机视图在导航回它时冻结

Question

在UIImagePickerController使用相机拍摄图像时的委托中，另一个视图被推送到导航堆栈上：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    picker.pushViewController(otherViewController, animated: true)
}

在otherViewController导航栏中可见：

override func viewDidLoad() {
    super.viewDidLoad()
    navigationController?.setNavigationBarHidden(false, animated: false) 
}

当< Back点击导航栏中的按钮时，导航栏再次变得不可见，出现相机视图，但相机图像被冻结并且点击底部栏按钮无效。

这是为什么？

Answer 1

A workaround is not to offer the user to navigate back by replacing the Back button with a Cancel button. That dismisses the UIImagePickerController and automatically dismisses all higher views on the navigation stack, including the otherViewController.

// Replace `Back` button with `Cancel` button in the `otherViewController`
navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(self.cancelButtonTapped))

@objc func cancelButtonTapped() {

   // Dismiss the `UINavigationController`, e.g. by calling a delegate function
   // ...
}

As a result the user would have to start the process again from the beginning instead of just navigating back.