控制器view及UIApplication的生命周期

一、控制器View的生命周期：

/***  view加载完毕*/
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        NSLog(@"ICKOneViewController-viewDidLoad");
    }
    
/***  view即将显示到window上**/
    - (void)viewWillAppear:(BOOL)animated
    {
        [super viewWillAppear:animated];
        NSLog(@"ICKOneViewController-viewWillAppear");
    }
    
/***  view显示完毕(已经显示到窗口)*/
    - (void)viewDidAppear:(BOOL)animated
    {
        [super viewDidAppear:animated];
        NSLog(@"ICKOneViewController-viewDidAppear");
    }
    
/***  view即将从window上移除(即将看不见)**/
    - (void)viewWillDisappear:(BOOL)animated
    {
        [super viewWillDisappear:animated];
        NSLog(@"ICKOneViewController-viewWillDisappear");
    }
    
/***  view从window上完全移除(完全看不见)**/
    - (void)viewDidDisappear:(BOOL)animated
    {
        [super viewDidDisappear:animated];
        NSLog(@"ICKOneViewController-viewDidDisappear");
    }


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/***  view即将销毁的时候调用*/
    - (void)viewWillUnload
    {
        [super viewWillUnload];
    }

/***  view销毁完毕的时候调用*/
    - (void)viewDidUnload
    {
        [super viewDidUnload];
        // 由于控制器的view已经不在了,需要显示在view上面的一些数据也不需要
        self.apps = nil;
        self.persons = nil;
    //    
    //    [self.apps release];
    //    [self.persons release];
    }

/***  当接收到内存警告的时候*/
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
    }

二、application的生命周期：

      // 1、程序启动完成的时候调用
    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
           NSLog(@"%s",__func__);
        return YES;
    }

        // 2、当app失去焦点的时候调用
    - (void)applicationWillResignActive:(UIApplication *)application {
            NSLog(@"%s",__func__);
      }

      // 3、app进入后台的时候调用
      // app忽然打断的时候，在这里保存一些需要用到的数据
    - (void)applicationDidEnterBackground:(UIApplication *)application {
            NSLog(@"%s",__func__);
        }


        // 4、app进入即将前台
    - (void)applicationWillEnterForeground:(UIApplication *)application {
            NSLog(@"%s",__func__);
        }

       // 5、当app获取到焦点的时候调用，意味着app可以与用户交互
    - (void)applicationDidBecomeActive:(UIApplication *)application {
            NSLog(@"%s",__func__);
       }

       // 6、app被关闭的时候调用
    - (void)applicationWillTerminate:(UIApplication *)application {
            NSLog(@"%s",__func__);
    }


      // 7、app接收到内存警告的时候调用
      // 清空图片的缓存
    - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
    {
        NSLog(@"%s",__func__);
    }