使用通知中心观察App的生命周期

//在main函数上面定义一个观察类,并实现了一个方法观察通知

@interface Observe :NSObject

- (void)iwatch:(NSNotification *)note;

@end

@implementation Observe

- (void)iwatch:(NSNotification *)note

{    NSLog(@"name: %@\n object is :%@",note.name, [note.objectclass]);

}

@end

//在main函数中实例化一个观察对象,并注册到默认通知中心

int main(int argc,char * argv[]) {   

@autoreleasepool {               

Observe *observor = [[Observealloc]init];       

[[NSNotificationCenterdefaultCenter]addObserver:observorselector:@selector(iwatch:)name:nilobject:nil];                       

returnUIApplicationMain(argc, argv,nil,NSStringFromClass([AppDelegateclass]));    } }

/*App启动后的Log信息, 根视图控制器使用Xib文件初始化*/

2013-12-2019:45:21.162 animateSummary[3142:a0b] name: NSUserDefaultsDidChangeNotification object is :NSUserDefaults

//文档中的说明:当一个持久域中的默认值被改变时发出.来自NSUserDefaults对象,不包含userinfo.

2013-12-2019:45:21.448 animateSummary[3142:a0b] name: NSBundleDidLoadNotification
object is :NSBundle
//userinfo字典包含一个 NSLoadClasses 键;

2013-12-2019:45:21.454 animateSummary[3142:1003] name: AccessibilitySettingsLoaderDidUpdateSettings object is :(null)

//查不到

2013-12-2019:45:21.554 animateSummary[3142:a0b] Cannot find executablefor CFBundle0x8e92e30 </Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk/System/Library/AccessibilityBundles/CertUIFramework.axbundle> (not loaded)

//App启动后的一个提示.

2013-12-2019:45:21.563 animateSummary[3142:a0b] name: _UIWindowDidCreateWindowContextNotification object is :UIStatusBarWindow

//状态栏的window创建了.

2013-12-2019:45:21.631 animateSummary[3142:a0b] name: UIApplicationWillChangeStatusBarFrameNotification object is :UIApplication

//状态栏的frame将要设定.

2013-12-2019:45:21.632 animateSummary[3142:a0b] name: UIApplicationStatusBarHeightChangedNotification object is :UIApplication

//状态栏高度发生改变

2013-12-2019:45:21.633 animateSummary[3142:a0b] name: UIApplicationDidChangeStatusBarFrameNotification object is :UIApplication

//状态栏设定完成

2013-12-2019:45:21.634 animateSummary[3142:a0b] name: UIWindowDidBecomeVisibleNotification object is :UIStatusBarWindow

//状态栏可见.

2013-12-2019:45:21.650 animateSummary[3142:a0b] name: _UIWindowDidCreateWindowContextNotification object is :UIWindow

//window实例化.

2013-12-2019:45:21.651 animateSummary[3142:a0b] name: UIWindowDidBecomeVisibleNotification object is :UIWindow

//window可见化.

2013-12-2019:45:21.651 animateSummary[3142:a0b] name: UIWindowDidBecomeKeyNotification object is :UIWindow

//设置为主window

2013-12-2019:45:21.668 animateSummary[3142:a0b] name: UIApplicationDidFinishLaunchingNotification object is :UIApplication

//应用完成加载

2013-12-2019:45:21.668 animateSummary[3142:a0b] name: _UIApplicationDidRemoveDeactivationReasonNotification object is :UIApplication

//

2013-12-2019:45:21.669 animateSummary[3142:a0b] name: UIApplicationDidBecomeActiveNotification object is :UIApplication

//应用进入活动状态.

2013-12-2019:45:21.671 animateSummary[3142:a0b] name: UIDeviceOrientationDidChangeNotification object is :UIDevice

//设备朝向完成改变.

2013-12-2019:45:21.674 animateSummary[3142:a0b] name: UIApplicationDidEndResumeAnimationNotification object is :UIApplication

//应用完成动画效果启动.

2013-12-2019:45:22.308 animateSummary[3142:a0b] name: _UIWindowDidCreateWindowContextNotification object is :UITextEffectsWindow

//

2013-12-2019:45:22.309 animateSummary[3142:a0b] name: UITextEffectsWindowDidRotateNotification object is :UITextEffectsWindow

//

2013-12-2019:45:23.541 animateSummary[3142:a0b] name: NSUserDefaultsDidChangeNotification object is :NSUserDefaults

//用户默认设置改变

2013-12-2019:45:23.544 animateSummary[3142:3b0b] name: NSWillBecomeMultiThreadedNotification object is :(null)
//开启多线程


/*当home键被按下时*/
2013-12-2020:04:17.188 animateSummary[3142:a0b] name: UIApplicationWillBeginSuspendAnimationNotification object is :UIApplication

//挂起动画效果

2013-12-2020:04:17.800 animateSummary[3142:a0b] name: _UIApplicationWillAddDeactivationReasonNotification object is :UIApplication

//

2013-12-2020:04:17.801 animateSummary[3142:a0b] name: UIApplicationWillResignActiveNotification object is :UIApplication

//将要退出活动状态.

2013-12-2020:04:17.894 animateSummary[3142:a0b] name: UIApplicationSuspendedNotification object is :UIApplication

//

2013-12-2020:04:17.895 animateSummary[3142:a0b] name: UIApplicationDidEnterBackgroundNotification object is :UIApplication

//应用进去后台.

2013-12-2020:04:17.896 animateSummary[3142:a0b] name: UIStatusBarStyleOverridesDidChangeNotification object is :(null)

//状态条样式重写完成.

2013-12-2020:04:18.000 animateSummary[3142:a0b] name: UIStatusBarStyleOverridesDidChangeNotification object is :(null)

//

2013-12-2020:04:18.000 animateSummary[3142:a0b] name: _UIApplicationDidFinishSuspensionSnapshotNotification object is :UIApplication

//应用冻结.

 

2013-12-2020:04:18.001 animateSummary[3142:a0b] name: UIKeyboardCandidateCorrectionDidChangeNotification object is :(null)

//候选键盘改变.

2013-12-2020:04:18.001 animateSummary[3142:a0b] name: UIKeyboardCandidateCorrectionDidChangeNotification object is :(null)

//

2013-12-2020:04:18.002 animateSummary[3142:a0b] name: _UIWindowWillDestroyWindowContextNotification object is :UIStatusBarWindow

//状态栏销毁window环境

2013-12-2020:04:18.002 animateSummary[3142:a0b] name: _UIWindowWillDestroyWindowContextNotification object is :UIWindow

//window销毁window环境

2013-12-2020:04:18.003 animateSummary[3142:a0b] name: _UIWindowWillDestroyWindowContextNotification
object is :UITextEffectsWindow

//..