为什么让我的视图的框架 return 全屏，即使视图已通过 safeArea 约束运行？

Question

在展示我的 GameScene 之前，我将 safeAreaLayoutGuide 应用到初始视图屏幕 （下面的代码来自 GameViewController）.

如果在我调用之前的任何时候 view.presentScene(scene) 我尝试获取视图的框架，我得到一个空集。

如果我得到框架，在呈现场景后，我得到全屏的矩形，即使视图确实出现在 safeAreaLayoutGuide 中。

如何获取视图的安全调整屏幕坐标？ 我应该注意我这样做是为了我可以对我的 GameScene 应用适当的约束，因为我只能找到如何为 UIView 做这件事。

class GameViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() if let view = self.view as! SKView?{ let screenWidthInPoints = UIScreen.main.bounds.width let screenHeightInPoints = UIScreen.main.bounds.height let imageView = UIView() imageView.backgroundColor = .red view.addSubview(imageView) imageView.translatesAutoresizingMaskIntoConstraints = false imageView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor).isActive = true imageView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true imageView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor).isActive = true imageView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor , constant: -0).isActive = true let scene = GameScene(size: CGSize(width: screenWidthInPoints, height: screenHeightInPoints)) scene.backgroundColor = .black scene.scaleMode = .aspectFit view.presentScene(scene) var myRect = view.frame

Answer 1

UIScreen.main.bounds代表整个屏幕，而不仅仅是安全区域。您将必须创建一个单独的视图，将其限制为安全区域插图以获得正确的安全区域大小。在您的情况下，您已经将 imageView 放置在安全区域内。尝试在添加约束后打印出它的大小并在 DispatchQueue.main.async 内执行以确保它仅在当前 pass 布局完成后才被调用。

    let imageView = UIView()
    imageView.backgroundColor = .red
    view.addSubview(imageView)
    
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor).isActive = true
    imageView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0).isActive = true
    imageView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor).isActive = true
    imageView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor , constant: -0).isActive = true
    
    
    DispatchQueue.main.async {
        print("imageView.frame: ", imageView.frame)
        
        let scene = GameScene(size: CGSize(width: imageView.frame.width,
                                           height: imageView.frame.height))
        scene.backgroundColor = .black
        scene.scaleMode = .aspectFit
        view.presentScene(scene)
    }

为什么让我的视图的框架 return 全屏，即使视图已通过 safeArea 约束运行？

Why does getting my view's frame return the full screen, even tho the view has been run through the safeArea constraints?

uikit

uiview

swift

safearealayoutguide