ios - 尝试呈现 View Controller 时对开始/结束外观转换的不平衡调用

Question

当我尝试呈现之前添加为子 Controller 的 View Controller 时，出现对开始/结束外观转换的不平衡调用错误，如何解决这个问题？

Unbalanced calls to begin/end appearance transitions

class VideoViewController: UIViewController {

}


class BigPlayerVC: UIViewController {
    let videoVC = VideoViewController()

    override func viewDidLoad() {
        super.viewDidLoad()
        addChild(videoVC)
        view.addSubview(videoVC.view)
        videoVC.view.translatesAutoresizingMaskIntoConstraints = false
    //  view.constrainViewEqual(videoReactController.playerView, top: 0, bottom: 0, left: 0, righta: 0)
        videoVC.didMove(toParent: self)
    }

    @objc func onBTNClick() {
        videoVC.willMove(toParent: nil)
        videoVC.view.removeFromSuperview()
        videoVC.view.translatesAutoresizingMaskIntoConstraints = true
        videoVC.removeFromParent()
        self.present(videoVC, animated: false, completion: nil)
    }
}

Answer 1

我有一个临时解决方案:只需在 DispatchBlock 中延迟移动 present 方法如下所示:

DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.1) {
    self.present(videoVC, animated: false, completion: nil)
}