所有默认的生命周期函数
• applicationWillFinishLaunching
• applicationDilFinishLaunching
• applicationWillBecomeActive
• applicationDidBecomeActive
• applicationWillResignActive
• applicationDidResignActive
• applicationWillUpdate
• applicationDidUpdate
• applicationWillHide
• applicationDidHide
• applicationWillUnhide
• applicationDidUnhide
• applicationDidChangeOcclusionState
• applicationShouldTerminate
• applicationWillTerminate
应用程序启动时
• applicationWillFinishLaunching
• applicationWillBecomeActive
• applicationDidBecomeActive
• applicationDidFinishLaunching
• applicationDidChangeOcclusionState
应用程序退出时
• applicationShouldTerminate
• applicationWillTerminate
点击隐藏应用（Hide）
• applicationWillHide
• applicationDidHide
• applicationWillResignActive
• applicationDidResignActive
• applicationDidChangeOcclusionState
点击展示应该（show）
• applicationWillUnhide
• applicationDidUnhide
• applicationWillBecomeActive
• applicationDidBecomeActive
• applicationDidChangeOcclusionState
点击最小化
• applicationDidChangeOcclusionState
• applicationWillResignActive
• applicationDidResignActive
最小化后展示
• applicationDidChangeOcclusionState
• applicationWillBecomeActive
• applicationDidBecomeActive
变成活跃状态
• applicationWillBecomeActive
• applicationDidBecodeActive
退出活跃状态
• applicationWillResignActive
• applicationDidResignActive
改变界面的状态
• applicationDidChangeOcclusionState
更新状态
• applicationWillUpdate
• applicationDidUpdate
下一篇将会对每一个生命周期函数进行详解：
AppDelegate 生命周期二：https://www.cnblogs.com/Jaryer/p/14036641.html