Could not find a storyboard named 'Main' in bundle NSBundle

1、刪掉工程中main.storyboard 后要刪除plist文件中對應的鍵值，否則會報如下錯誤： Could not find a storyboard named 'Main' in bundle NSBundle

2、刪除main.storyboard后，需要在AppDelegate.m中初始化一個window進行使用，否則應用程序沒有window可用。

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];