How to refresh UITableView after app comes becomes active again?

Question

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

Just call `[self.tableView reloadData]` . Does it work for you? What do you mean by reference the current UITableView? — vodkhang, Jul 21 '10 at 15:06
i think more information about how the tableView is created, is it in the rootdelegate or a seperate controller? this would be helpful in providing an answer — Aaron Saunders, Jul 21 '10 at 15:09
Updated my post, my UITableView is managed by a seperate controller — Sheehan Alam, Jul 21 '10 at 15:16

score 30 · Accepted Answer · edited Mar 06 '11 at 17:54

30

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];
}

edited Mar 06 '11 at 17:54

John Topley

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answered Jul 21 '10 at 15:58

Aaron Saunders

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what happens when this is run on anything but an iPhone 4? – Sheehan Alam Jul 21 '10 at 16:18
You may need to do some macro if else for different iphone version – vodkhang Jul 21 '10 at 16:23
How can I determine what phone version the user is running? – Sheehan Alam Jul 21 '10 at 16:55
1

this really is a new question.... http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIDevice_Class/Reference/UIDevice.html#//apple_ref/occ/instp/UIDevice/model – Aaron Saunders Jul 21 '10 at 17:08
There's no need to clean up the notification if I have ARC on, right? – thisiscrazy4 Dec 13 '12 at 21:52

score 3 · Answer 2 · answered Jul 21 '10 at 15:31

3

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

answered Jul 21 '10 at 15:31

Ole Begemann

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Can you show me an example of how I can use UIApplicationDidBecomeActiveNotification in my view controller? – Sheehan Alam Jul 21 '10 at 15:37

score 0 · Answer 3 · answered Jul 21 '10 at 15:41

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]; }

How to refresh UITableView after app comes becomes active again?

3 Answers3

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