1、我們在mean.storyBoard中建立一個viewController，如果沒有‘Initial View Controller’，會Log“Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?”。
2、我們建立一個storyBoard，命名：Second_StoryBoard。若想将其添加為第一顯示界面，我們不僅要“Intial View Controller”，還要在TARGETS中設定Deployment Target的Mian Interface為“Second_StoryBoard”.
