iOSAPP前台后台切换的处理

来源：互联网发布：java aes 256 cbc 编辑：程序博客网时间：2024/06/15 23:22

对于APP前后台切换的监听，大家所熟知的就是，在AppDelegate中实现下面两个方法，能够监听从后台恢复到前台

- (void)applicationDidEnterBackground:(UIApplication *)application {     log4info(@"---applicationDidEnterBackground----");    //进入后台  }  - (void)applicationDidBecomeActive:(UIApplication *)application {      NSLog(@"---applicationDidBecomeActive----");     //进入前台        } - (void)applicationDidEnterBackground:(UIApplication *)application{    log4info(@"---applicationDidEnterBackground----");   //进入后台}- (void)applicationDidBecomeActive:(UIApplication *)application{    NSLog(@"---applicationDidBecomeActive----");    //进入前台   }

但是单个UIViewController怎么监听呢

在-viewDidLoad方法中，添加一下代码监听notification

[[NSNotificationCenter defaultCenter] addObserver:self                                          selector:@selector(someMethod:)                                              name:UIApplicationDidBecomeActiveNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self                                         selector:@selector(someMethod:)                                             name:UIApplicationDidBecomeActiveNotification object:nil];

别忘了在-dealloc中将监听移除：

[[NSNotificationCenter defaultCenter] removeObserver:self]; [[NSNotificationCenter defaultCenter] removeObserver:self];

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