IOS中AppDelegate的生命周期

/** *  app加载完毕的时候调用(一般只调用一次) * */- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    NSLog(@"didFinishLaunchingWithOptions");    return YES;}/** *  app失去焦点的时候调用(UI控件不能正常使用) */- (void)applicationWillResignActive:(UIApplication *)application{    NSLog(@"applicationWillResignActive");}/** *  app进入后台的时候调用(app消失不见) */- (void)applicationDidEnterBackground:(UIApplication *)application{    NSLog(@"applicationDidEnterBackground");}/** *  app进入前台的时候调用(app显示出来) */- (void)applicationWillEnterForeground:(UIApplication *)application{    NSLog(@"applicationWillEnterForeground");}/** *  当app获得焦点的时候调用(这时候整个app的UI控件都能正常使用) */- (void)applicationDidBecomeActive:(UIApplication *)application{//    UITabBarController *tabbarVc = (UITabBarController *)self.window.rootViewController;//    NSLog(@"%@", NSStringFromCGRect(tabbarVc.tabBar.frame));   //    for (UIView *child in tabbarVc.tabBar.subviews) {//        if ([child isKindOfClass:[UIImageView class]]) {//            [child removeFromSuperview];//        }//    }    NSLog(@"applicationDidBecomeActive");}//app进入后台:休眠,  不能接受事情(比如关闭)/** *  app关闭的时候调用(一般情况下不会调用) */- (void)applicationWillTerminate:(UIApplication *)application{    NSLog(@"applicationWillTerminate");}