移除main.storyboard

解决方法如下：

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@property(nonatomic, strong) UIWindow *window;

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- (void) createAppWindow {
    if(@available(iOS 13.0, *)) {
        
    } else {
        self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
        self.window.rootViewController = [[ViewController alloc] init];
        self.window.backgroundColor = [UIColor whiteColor];
        [self.window makeKeyAndVisible];
    }
}

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if(scene) {
        UIWindowScene *windowScene = (UIWindowScene*)scene;
        self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
        self.window.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);
        self.window.rootViewController = [[ViewController alloc] init];
        self.window.backgroundColor = [UIColor whiteColor];
        [self.window makeKeyAndVisible];
    }