IOS 前后台切换

- (void)applicationDidEnterBackground {      NSLog(@"=======applicationDidEnterBackground========");  }    - (void)applicationWillEnterForeground {      [CheckNetwork isExistenceNetwork];      NSLog(@"=======applicationWillEnterForeground========");  }    - (void)viewDidLoad {      [super viewDidLoad];      [UIApplication sharedApplication].statusBarHidden = NO;            [[NSNotificationCenter defaultCenter] addObserver:self                                                selector:@selector(applicationDidEnterBackground)                                                   name:UIApplicationDidEnterBackgroundNotification                                                      object:[UIApplication sharedApplication]];      [[NSNotificationCenter defaultCenter] addObserver:self                                                selector:@selector(applicationWillEnterForeground)                                                   name:UIApplicationWillEnterForegroundNotification                                                 object:[UIApplication sharedApplication]];  }  

转载于:https://www.cnblogs.com/wangdoubleyan/archive/2012/05/22/2512851.html