Question

我正在尝试提供一个新的VC，但是当我点击代码应用程序时，它被卡住了，无法执行任何操作。这是一个很奇怪的问题，我该如何解决？我展示新VC的代码是这样，

let vc : PropertyDetailController! =
        UIStoryboard.viewController(identifier: "PropertyDetailController", storyBoard: "Explore") as? PropertyDetailController

    vc.propertyDetailData = property
    vc.hidesBottomBarWhenPushed = true
    vc.modalTransitionStyle = .crossDissolve
    vc.modalPresentationStyle = .fullScreen
    self.navigationController?.present(vc, animated: true, completion: nil)

这就是它在控制台中显示的内容，

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

它不存在新的VC。这就是我的应用卡住的方式，请检查gif链接， enter link description here

Answer 1

正如我在您的代码中看到的那样，您正在使用新的故事板，因此有必要通过UINavigationController

其中一个示例代码可能会对您有所帮助

let storyBoard: UIStoryboard = UIStoryboard(name: "YOUR_STORYBOARD", bundle: nil)
let aVC: YOUR_VC = storyBoard.instantiateViewController(withIdentifier: "YOUR_VC_ID") as! YOUR_VC
let navigationController = UINavigationController(rootViewController: aVC)
self.present(navigationController, animated: true, completion: nil)

Answer 2

[在此处输入图片描述] [1]首先确保当前视图控制器已嵌入导航控制器。

现在使用以下代码解决此问题。

let storyboard = UIStoryboard(name: "Explore", bundle: nil)

        guard let vc = storyboard.instantiateViewController(withIdentifier: "PropertyDetailController") as? PropertyDetailController else {return}
        vc.hidesBottomBarWhenPushed = true
        vc.modalTransitionStyle = .crossDissolve
        vc.modalPresentationStyle = .fullScreen
        self.navigationController?.present(vc, animated: true, completion: nil)


  [1]: https://i.stack.imgur.com/c7iBr.png

Answer 3

如果要显示视图控制器，请尝试
self.present(vc, animated: true, completion: nil)

如果要推送视图控制器，请尝试
self.navigationController?.pushViewController(vc, animated: true)

Answer 4

尝试将推送代码移至主线程，

DispatchQueue.main.async {[weak self] in
    self?.navigationController?.pushViewController(vc, animated: true)
}

存在或推送，所有UI处理都必须在主线程上完成。

编辑：

如果要显示vc，请使用

DispatchQueue.main.async {[weak self] in
    self?.present(vc, animated: true, completion: nil)
}

快速呈现新VC时应用程序卡住

4 个答案: