横向呈现模态 VC 时，父 VC 中的安全区域发生变化

Question

第一个 UI 中的安全区域插入ViewController 当我显示第二个时，更改为横向安全区域插入ViewController，它仅支持横向。

GIF with described bug

GIF with described bug that touches TabBar and TableView

第一个ViewController:

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)
  }
}

第二个ViewController:

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

Answer 1

我就是这样解决约束问题的： https://gist.github.com/filletofish/b56600e9e661aa6e49cc0a56a98b37a3

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?()
    })
  }

横向呈现模态 VC 时，父 VC 中的安全区域发生变化

Safe Area changes in parent VC when presenting modally VC in landscape

ios

ios11

landscape

landscape-portrait

safearealayoutguide