iOS系统的底层通知框架库

操作系统底层支持了一些预置的通知消息，这些通知消息在头文件notify_keys.h中被声明。这些预置的消息有针对目录服务的、有针对磁盘空间和卷挂起的、有针对网络配置改变的、有针对写日志通知的、有针对系统时区和时间改变的。每种具体的通知消息可以看文件中的说明，比如下面的例子实现对了对磁盘空间不足，网络状态改变以及对调整了系统的时间进行的监听处理：

#include <notify.h> 
#include <notify_keys.h> 
 
void foo() 
{ 
   int  token1, token2, token3; 
    //注册监听网络状态改变的通知。 
   notify_register_dispatch(kNotifySCNetworkChange, & token1, dispatch_get_main_queue(), ^(int token) { 
        //... 
    }); 
     
      
    //注册监听系统磁盘空间不足的通知 
    notify_register_dispatch(kNotifyVFSLowDiskSpaceRootFS, &token2, dispatch_get_main_queue(), ^(int token) { 
        //.... 
    }); 
   
     
   //注册监听系统时间被改变的通知。 
    notify_register_dispatch(kNotifyClockSet, &token3, dispatch_get_main_queue(), ^(int token) { 
        //... 
    }); 
     
} 

除了notify_keys.h文件中公开的通知消息外，还有一些未被公开的通知消息，我们可以通过这些未被公开的消息来获取更多关于系统状态的改变，下面的列表将列出所有的系统底层的通知消息，具体每个通知是什么意义就读者自行猜测和验证吧。

"com.apple.asl.remote" 
"com.apple.system.timezone" 
"com.apple.MCX._managementStatusChangedForDomains" 
"com.apple.CFPreferences._domainsChangedExternally" 
"com.apple.system.clock_set" 
"com.apple.system.timezone" 
"AppleNumberPreferencesChangedNotification" 
"AppleTimePreferencesChangedNotification" 
"AppleDatePreferencesChangedNotification" 
"AppleLanguagePreferencesChangedNotification" 
"AppleTextBehaviorPreferencesChangedNotification" 
"com.apple.librarian.account-token-changed" 
"com.apple.system.batterysavermode" 
"com.apple.accessibility.cache.forcetouch.sensitivity.changed" 
"com.apple.networkd.started" 
"com.apple.neconfigurationchanged" 
"com.apple.networkd.settings" 
"com.apple.system.config.network_change" 
"com.apple.CoreAnimation.CAWindowServer.DisplayChanged" 
"com.apple.networkd.proxy_count" 
"com.apple.iohideventsystem.available" 
"com.apple.backboardd.rawOrientation" 
"com.apple.springboard.hasBlankedScreen" 
"UIBacklightLevelChangedNotification" 
"com.apple.accessibility.wob.status" 
"com.apple.backboardd.videosettingschanged" 
"com.apple.mobile.keybagd.user_changed" 
"com.apple.LaunchServices.database" 
"com.apple.accessibility.cache.enhance.text.legibility" 
"com.apple.frontboard.systemappservices.serverNotifyToken" 
"com.apple.frontboard.workspace.serverNotifyToken" 
"com.apple.accessibility.cache.captioning" 
"com.apple.accessibility.cache.vot" 
"com.apple.accessibility.cache.ax" 
"com.apple.accessibility.cache.app.ax" 
"com.apple.accessibility.status" 
"com.apple.language.changed" 
"com.apple.springboard.showingAlertItem" 
"com.apple.mobile.keybagd.lock_status" 
"NameLayerTree" 
"ApplePreferredContentSizeCategoryChangedNotification" 
"kKeepAppsUpToDateEnabledChangedNotification" 
"com.apple.accessibility.cache.reduce.motion" 
"UIKeyboardSpringBoardKeyboardShow" 
"UIKeyboardSpringBoardKeyboardHide" 
"com.apple.locationd.registration" 
"kCTDaemonReadyNotification" 
"com.apple.system.config.network_change" 
"com.apple.system.timezone./var/db/timezone/zoneinfo/UTC" 
"com.apple.system.info:/etc/hosts" 
"com.apple.MSVLoggingConfigurationDidChange" 
"com.apple.managedconfiguration.defaultsdidchange" 
"com.apple.AppSupport.loggingDefaultsChanged" 
"com.apple.mobileipod.MPMusicPlayerController.launched" 
"com.apple.networkd.nat64.ifstate" 
"com.apple.ManagedConfiguration.profileListChanged" 
"com.apple.backboardd.unambiguousOrientation" 
"com.apple.accessibility.cache.button.shapes.enabled" 
"com.apple.accessibility.cache.use.single.system.color.enabled" 
"com.apple.accessibility.cache.darken.system.colors.enabled" 
"com.apple.coreui.statistics" 
"com.apple.UIKit.UIScreenEdgeGestureMode" 
"com.apple.managedconfiguration.restrictionchanged" 
"com.apple.managedconfiguration.passcodechanged" 
"PINPolicyChangedNotification" 
"com.apple.managedconfiguration.settingschanged" 
"com.apple.managedconfiguration.effectivesettingschanged" 
"com.apple.managedconfiguration.appwhitelistdidchange" 
"com.apple.managedconfiguration.defaultsdidchange" 
"com.apple.managedconfiguration.keyboardsettingschanged" 
"com.apple.managedconfiguration.clientrestrictionschanged" 
"com.apple.managedconfiguration.webFilterUIActiveDidChange" 
"com.apple.ManagedConfiguration.managedAppsChanged" 
"MCManagedBooksChanged" 
"com.apple.managedconfiguration.allowpasscodemodificationchanged" 
"com.apple.mediaserverd.up" 
"com.apple.hangtracer.prefchangednotification" 
"com.apple.accessibility.cache.enhance.background.contrast" 
"com.apple.system.thermalpressurelevel" 
"com.apple.backboardd.backlight.changed" 
"com.apple.accessibility.QuickSpeakEnabled" 
"com.apple.accessibility.cache.quick.speak" 
"com.apple.powerlog.state_changed" 
"com.apple.powerlog.clientPermissionState" 

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