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1步.main函數(shù)
2步.UIApplicationMain
*創(chuàng)建UIApplication對(duì)象
*創(chuàng)建UIApplication的delegate對(duì)象
3步.delegate對(duì)象開始處理(監(jiān)聽)系統(tǒng)事件(沒有storyboard)
*程序啟動(dòng)完畢的時(shí)候,就會(huì)調(diào)用代理的application:didFinishLaunchingWithOptions:方法
*在application:didFinishLaunchingWithOptions:中創(chuàng)建UIWindow
*創(chuàng)建和設(shè)置UIWindow的rootViewController
*顯示窗口
3.1步.根據(jù)Info.plist獲得最主要storyboard的文件名,加載最主要的storyboard(有storyboard)
*創(chuàng)建UIWindow
*創(chuàng)建和設(shè)置UIWindow的rootViewController
*顯示窗口