iOS 13下XCode开发应用全屏显示异常问题求助

针对你遇到的iOS 13上应用被安全区域裁剪、无法全屏的问题，可尝试以下针对性解决思路：

1. 修正根视图的安全区域忽略逻辑 #

确保SwiftUI根视图的edgesIgnoringSafeArea(.all)应用在最外层容器，配合frame(maxWidth: .infinity, maxHeight: .infinity)彻底摆脱安全区域限制：

let rootView = MainView()
    .frame(maxWidth: .infinity, maxHeight: .infinity)
    .edgesIgnoringSafeArea(.all)

2. iOS 13下UIHostingController的特殊兼容 #

iOS 13的UIHostingController在安全区域处理逻辑上与iOS 14+存在差异，可通过重置additionalSafeAreaInsets强制移除额外边距：

let hostingController = UIHostingController(rootView: rootView)
if #available(iOS 14, *) {
    // iOS14+ 系统已自动兼容，无需额外操作
} else {
    hostingController.additionalSafeAreaInsets = UIEdgeInsets(
        top: -hostingController.additionalSafeAreaInsets.top,
        left: -hostingController.additionalSafeAreaInsets.left,
        bottom: -hostingController.additionalSafeAreaInsets.bottom,
        right: -hostingController.additionalSafeAreaInsets.right
    )
}

3. 强制设置窗口全屏Frame #

iOS 13下手动将窗口Frame绑定到屏幕边界，避免系统自动限制窗口尺寸：

let window = UIWindow(windowScene: windowScene)
window.frame = windowScene.screen.bounds // 强制全屏
window.rootViewController = hostingController
self.window = window
window.makeKeyAndVisible()

4. 补充排查方向 #

• 检查全局UIViewController扩展或类别是否修改了安全区域属性，导致布局异常
• 确认启动页（Launch Screen）的约束配置，iOS 13下启动页的安全区域设置可能影响应用启动后的布局
• 在iOS 13模拟器中调试，打印window.safeAreaInsets和hostingController.view.safeAreaInsets的值，定位具体边距来源

修改后的完整SceneDelegate代码 #

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = scene as? UIWindowScene else { return }
        
        let rootView = MainView()
            .frame(maxWidth: .infinity, maxHeight: .infinity)
            .edgesIgnoringSafeArea(.all)
        
        let hostingController = UIHostingController(rootView: rootView)
        if #available(iOS 14, *) {
            // iOS14+ 兼容处理
        } else {
            hostingController.additionalSafeAreaInsets = UIEdgeInsets(
                top: -hostingController.additionalSafeAreaInsets.top,
                left: -hostingController.additionalSafeAreaInsets.left,
                bottom: -hostingController.additionalSafeAreaInsets.bottom,
                right: -hostingController.additionalSafeAreaInsets.right
            )
        }
        
        let window = UIWindow(windowScene: windowScene)
        window.frame = windowScene.screen.bounds
        window.rootViewController = hostingController
        self.window = window
        window.makeKeyAndVisible()
        
        UNUserNotificationCenter.current().delegate = self
    }

    func sceneDidDisconnect(_ scene: UIScene) {}
    func sceneWillResignActive(_ scene: UIScene) {}
    func sceneWillEnterForeground(_ scene: UIScene) {}
}

内容的提问来源于stack exchange，提问作者Bharat Sharma