iOS-生命週期

1.應用生命週期

    Not running  →  Inactive → Active  →  Background → Suspended 

Not running 非運行狀態

Inactive  前臺非活動狀態

Active 前臺活動狀態

Background 後臺狀態

Suspended 掛起狀態

非運行狀態——應用啓動情景

Not running → Inactive → Active

        Not Running → Inactive    調用appliaction：didiFinishLaunchingWithOptions：方法

                                               發出UIApplicationDidFinshLanuchingNotification通知

        Inactive → Active              調用applicationDidBecomeActive：方法

                                                發出UIApplicationDidBecomeActiveNotification通知

點擊Home鍵——應用退出情景

應用能夠在後臺運行或者掛起

Active  →  Inactive → Background → Suspended

        Active  →  Inactive             調用applicationWillResignActive發：方法    

                                                發出UIApplicationWillResignActiveNotification通知

       Background → Suspended     調用applicationDidEnterBackground：方法

                                                 發出UIApplicationDidEnterBackgroundNotification通知

    應用不能夠在後臺運行或者掛起

Active  →  Inactive → Background → Suspended →  Not running 

      Background → Suspended         調用applicationDidEnterBackground：方法    

                                                    發出UIApplicationDidEnterBackgroundNotification通知

      Suspended →  Not running        調用applicationWillTerminate：方法

                                                    發出UIApplicationWillTerminateNotification通知    

 掛起從新運行情景

Suspended  → Background  →  Inactive → Active

    Background →  Inactive        調用applicationWiillEnterForeground：方法

                                               發出UIApplicationWiillEnterForegroundNotification通知

    nactive→Active                     調用applicationDidBecomeActive：方法

                                               發出UIApplicationDidBecomeActiveNotification通知

內存清除——應用終止情景

在內存清除場景俠，應用不會調用任何方法，也不會發出應用通知

2.視圖生命週期