在细节之后更新表视图数据

Question

I have got a problem. I need to update data of master view data on segue from detail view. I've tried to implement prepareForSegue method, but it's not called on tapping back button.

What's the way i can do that?

Answer 1

Prepare for segue doesn't get called when popping a view controller from the navigation stack. I'd suggest calling [tableView reloadData] either in the detail view's viewWillDisappear method, or in the master view's viewWillAppear method. Alternatively, if you want to reload your table view after making a change, you can try using notifications. Something like the following in your master view controller:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refresh:) name:@"RefreshMasterNotification" object:nil];
}

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

- (void)refresh:(NSNotification *)notification
{
    [tableView reloadData];
}

And something like the following whenever you make a change in your detail view controller:

[[NSNotificationCenter defaultCenter] postNotificationName:@"RefreshMasterNotification"];