DAY 16 『改用 xib 进行界面创作』

storyboard 有三个概念是最容易混淆：
1. xib：实际是个xml文件，xib = XML nib，可通过拖拽文件进行界面创作和布局。
2. nib：xib编译之後就得到nib文件，nib= NeXT Interface Builder
3. storyboard：类似升级版的xib，可以同时管理多个xib文件。
storyboard VS xib：

storyboard 注重於多个页面的层级关系及跳转
xib 注重於单个页面的布局，若多人开发同个专案，xib 比较推荐

先建专案

设定存档路径

New Group

New File

选Cocoa Touch Class

p.s: MainVC = Main ViewController

info.plist -> Application Scene Manifest -> Scene Configuration -> Application Session Role -> Item0 ( Default Configuration ) -> 删掉 Storyboard Name

选择xib档

找到 SceneDelegate.swift 下的 scene 函数

修改为此

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        
        guard let windowScene = (scene as? UIWindowScene) else { return }
                
                // MARK: Without NavigationController
                // let rootVC = MainVC(nibName: String(describing: MainVC.self), bundle: nil)
                // MARK: With NavigationController
                 let rootVC = UINavigationController(rootViewController: MainVC())
                
                window = UIWindow(frame: windowScene.coordinateSpace.bounds)
                window?.windowScene = windowScene
                window?.rootViewController = rootVC //navController
                window?.makeKeyAndVisible()
        
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).

    }

删除这两个档案