IOS不使用默认的mainStroryboard作为首个controller的方法

步骤1：

删除info.plist文件下的一条配置，如图

步骤2：

编辑AppDelegate.m，参考以下代码

@interface AppDelegate ()
//@property (strong, nonatomic) UIWindow * window;
@property(nonatomic,strong) UIWindow * win;
@property(nonatomic,strong) MyViewController * mainVC;
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
	// 创建自己的window
    self.win = [[UIWindow alloc]initWithFrame:UIScreen.mainScreen.bounds];
    // 创建主controller
    self.mainVC = [MyViewController new];
    // 创建导航，可选
    UINavigationController * nav = [[UINavigationController alloc]initWithRootViewController:_mainVC];
    self.win.rootViewController = nav;
    [self.win makeKeyAndVisible];
    return YES;
}

OK，两个步骤完事！