ios 监听app从后台恢复到前台

- (void)applicationDidEnterBackground:(UIApplication * )application
{
    NSLog(@"---applicationDidEnterBackground----")
    // 进入后台
}

- (void)applicationDidBecomeActive:(UIApplication * )application
{
    NSLog(@"---applicationDidBecomeActive----")
    // 进入前台
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    NSLog(@"---applicationDidEnterBackground----")
    // 进入后台
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    NSLog(@"---applicationDidBecomeActive----")
    // 进入前台
}

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(someMethod1:) 
                                             name:UIApplicationDidBecomeActiveNotification object:nil];