1. AppDelegate.h 加上 window 属性

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (nonatomic, strong) UIWindow *window;

@end

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2. 删除 AppDelegate.m 中的 UISceneSession lifecycle

#pragma mark - UISceneSession lifecycle
- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {
    // Called when a new scene session is being created.
    // Use this method to select a configuration to create the new scene with.
    return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];
}

- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {
    // Called when the user discards a scene session.
    // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
    // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}

3. 删除 info.plist 的 Application Scene Manifest

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4. 设置项目前缀

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5. 设置Deployment Info

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6. 新建 PCH 文件，#import 常用的类和自定义分类

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7. 新建 .h 文件，设置用于适配屏幕的宏和自定义宏

新建一个类文件，继承于NSObject，新建后去掉.m文件即可

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8. 新建 Supporting Files 文件夹，将 AppDelegate 和新建好的文件拖进去

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9. 设置 PCH 文件的位置

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10. 设置 info.plist 文件的位置

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11.根据你当前项目的布局新建加了前缀的 UITabbarController 或 UIViewController 作为主控制器

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最后

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