UIApplication中的一些方法用途

//启动基本完成程序准备开始运行.
- ( BOOL )application:( UIApplication *)application didFinishLaunchingWithOptions:( NSDictionary *)launchOptions {
     return YES ;
}
//当应用程序将要进入非活动状态.在此期间,应用程序不接收消息或事件,好比来电话了.
- ( void )applicationWillResignActive:( UIApplication *)application {}
//当程序被推送到后台的时候调用。因此要设置后台继续运行,则在这个函数里面设置便可.
- ( void )applicationDidEnterBackground:( UIApplication *)application {}
//当程序从后台将要从新回到前台时候调用.
- ( void )applicationWillEnterForeground:( UIApplication *)application {}
//当应用程序入活动状态执行.
- ( void )applicationDidBecomeActive:( UIApplication *)application {}
//当程序将要退出是被调用,一般是用来保存数据和一些退出前的清理工做。这个须要要设置UIApplicationExitsOnSuspend的键值。
- ( void )applicationWillTerminate:( UIApplication *)application {}
//请求委托打开一个 URL资源
- ( BOOL ) application:( UIApplication *) application handleOpenURL:( NSURL *)url{}
//请求委托打开一个 URL资源
- ( BOOL ) application:( UIApplication *) application openURL:( NSURL *)url sourceApplication:( NSString *)sourceApplication annotation:( id )annotation{}
//当内存低告警时
- ( void )applicationDidReceiveMemoryWarning:( UIApplication *)application{}
//当系统时间发生显著改变时
-( void )applicationSignificantTimeChange:( UIApplication *)application{}
//当一个运行着的应用程序收到一个远程的通知 发送到委托去...7.0以前
- ( void )application:( UIApplication *)application didReceiveRemoteNotification:( NSDictionary *)userInfo{}
//当一个运行着的应用程序收到一个远程的通知 发送到委托去...7.0以后
- ( void )application:( UIApplication *)application didReceiveRemoteNotification:( NSDictionary *)userInfo fetchCompletionHandler:( void (^)( UIBackgroundFetchResult ))completionHandler{}
//当一个应用程序成功的注册一个推送服务(APS) 发送到委托去...
-( void ) application :( UIApplication *) application didRegisterForRemoteNotificationsWithDeviceToken:( NSData *) deviceToken{}
//当 APS没法成功的完成向 程序进程推送时 发送到委托去..
-( void ) application :( UIApplication *) application didFailToRegisterForRemoteNotificationsWithError:( NSError *) error{}
//当一个运行着的应用程序收到一个本地的通知 发送到委托去...
-( void ) application :( UIApplication *) application didReceiveLocalNotification:( UILocalNotification *)notification{}
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