Xcode 11创建项目

前言

前段时间更新了Xcode 11，创建新项目时，发现工程里面多了新的类`SceneDelegate`，而且原来的`AppDelegate`中没有了Window，原来`SceneDelegate`是iOS 13中新加入的管理App生命周期的类，而且通过Storyboard加载页面，下面我就如何不使用Storuboard，来完成App启动。

OC

1.首先，肯定是在工程中找到Main.storyboard这个文件，然后删掉他。

2.在工程中Targets->项目名->General->Main Interface->删掉Main

3.工程中info.plist 找到ApplicationSceneManifest->Scene Configurations->ApplicationSessionRole->删掉StoryboardName

在SceneDelegate.m

- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.window.windowScene = scene;
ViewController *new = [ViewController new];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:new];
self.window.rootViewController = nav;
[self.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).
}

这样就可以了

Swfit

1、2、3步一样，在SceneDelegate.swift

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // 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).
    guard let windowScene = (scene as? UIWindowScene) else { return }
    
    window = UIWindow.init(frame: windowScene.coordinateSpace.bounds)
    window?.windowScene = windowScene
    window?.rootViewController = ViewController()
    window?.makeKeyAndVisible()
}