How to refresh UITableView after app comes becomes active again?

问题

I would like my UITableView to reloadData once my app is active again, after a user exits the application. I know I need to implement (in my app delegate):

- (void)applicationDidBecomeActive:(UIApplication *)application

but im not sure how to reference the current UITableView?

UPDATE: My UITableView is a separate controller. It is actually presented as follows

AppDelegate > Root View Controller > Pushes UITabBarController modally which has a UITableViewController

回答1:

following up on Ole's answer above

add this when initializing the viewcontroller

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

add the actual method in the controller

- (void)becomeActive:(NSNotification *)notification {
    NSLog(@"becoming active");
}

be sure to clean up the notification

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super dealloc];
}

回答2:

If you can't access your view controller from the app delegate, you could also have your controller listen to the UIApplicationDidBecomeActiveNotification notification.

回答3:

you can create your class called TableViewManager. in there register list of UITableView so that you can refresh any table you want. it's like this, in yourTableViewManager class, you have a method called

- (void)RefreshTableView:(UITableView *)tableView {
if(tableView != nil)
    [tableView reloadData]; }

来源：https://stackoverflow.com/questions/3300694/how-to-refresh-uitableview-after-app-comes-becomes-active-again