Ios 在景观中呈现模态VC时，父VC的安全区域发生变化

当我演示第二个ViewController时，第一个UIViewController中的安全区域插入将更改为横向安全区域插入，后者仅支持横向

FirstViewController：

class ViewController: UIViewController {

  @IBAction func showSecondVC(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let controller = storyboard.instantiateViewController(withIdentifier: "SecondViewController")

    self.present(controller, animated: true, completion: {
      print("completed")
    })
  }

  override func viewSafeAreaInsetsDidChange() {
    print(view.safeAreaInsets)
    super.viewSafeAreaInsetsDidChange()
    print(view.safeAreaInsets)
  }
}

class SecondViewController: UIViewController {
  override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    return [.landscape]
  }

  @IBAction func dismissYourSelff(_ sender: Any) {
    self.dismiss(animated: true, completion: nil)
  }
}

第二视图控制器：

class ViewController: UIViewController {

  @IBAction func showSecondVC(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let controller = storyboard.instantiateViewController(withIdentifier: "SecondViewController")

    self.present(controller, animated: true, completion: {
      print("completed")
    })
  }

  override func viewSafeAreaInsetsDidChange() {
    print(view.safeAreaInsets)
    super.viewSafeAreaInsetsDidChange()
    print(view.safeAreaInsets)
  }
}

class SecondViewController: UIViewController {
  override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    return [.landscape]
  }

  @IBAction func dismissYourSelff(_ sender: Any) {
    self.dismiss(animated: true, completion: nil)
  }
}

控制台输出：

UIEdgeInsets(top: 44.0, left: 0.0, bottom: 34.0, right: 0.0)
UIEdgeInsets(top: 44.0, left: 0.0, bottom: 34.0, right: 0.0)
UIEdgeInsets(top: 0.0, left: 44.0, bottom: 21.0, right: 44.0)
UIEdgeInsets(top: 0.0, left: 44.0, bottom: 21.0, right: 44.0)
completed

---

这就是我解决约束问题的方法：

我不得不使用快照来防止TabBar和TableView的错误布局

override func present(_ viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)? = nil) {
    var completionToRemoveSnapshot: (() -> ())? = nil

    let shouldUseSnapshot = SDiOSVersion.deviceSize() == .Screen5Dot8inch &&
      viewControllerToPresent.supportedInterfaceOrientations == .landscape

    if shouldUseSnapshot {
      if let snapShot = self.view.snapshotView(afterScreenUpdates: true) {
        viewController.view.addSubview(snapShot)
        completionToRemoveSnapshot = { snapShot.removeFromSuperview() }
      }
    }

    super.present(viewControllerToPresent, animated: flag, completion: {
      completionToRemoveSnapshot?()
      completion?()
    })
  }

---

您找到解决方案了吗？@MrJre请在下面检查我的答案。我修复了它，在演示期间显示快照，然后将其删除。仅适用于iPhone X设备。