Dismissing Popover and reload parentViewController

Question

I m actually new to developing iOS application. I currently developing an iPad application where there is two UIViewController (A and B). A is my parent view controller and B is my UITableView popover that don cover the entire A.

After a row select at B, i manage to dismissed B but it don reflect changes made to A. How do i reload the parent view or is a something like android called the onResume method. Or ways to solve this problem.

Please provide me with some pointers, have being stuck for hours. Thanks

You need to use delegate pattern. http://stackoverflow.com/questions/8055052/call-a-parent-view-controller-through-a-navigationcontroller/8055480#8055480 — user523234, Sep 16 '13 at 04:44

score 0 · Accepted Answer · answered Sep 16 '13 at 15:59

It depends on the situation. I would suggest 2 ways:

As someone mentioned before, you can make a delegate mechanism so that controller B can call something like -reloadData on controller A. This is a tight coupling but can solve your problem.

You can post a NSNotification from controller B and then listen to it in controller A. In controller B:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Do your logic here

    [[NSNotificationCenter defaultCenter] postNotificationWithName:@"SettingsSavedNotification" object:nil];

    // Dismiss B controller
}

And in controller A:

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveSettingsSavedNotification:) name:@"SettingsSavedNotification" object:nil];

    // Proceed with controller/view setup
}

- (void)didReceiveSettingsSavedNotification:(NSNotification *)notification
{
    // Reload data here
}

Don't forget to call -removeObserver:name:object: on controller A teardown.

score -1 · Answer 2 · answered Sep 16 '13 at 03:53

-1

Use – popoverDidClose: NSPopover class delegate method for update your data, or you may use cocoa binding.

answered Sep 16 '13 at 03:53

Nikolai Nagornyi

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`NSPopover` isn't the name of a class, and `popoverDidClose:` isn't a real selector. – Jared Egan Sep 16 '13 at 04:15
NSPopover is a class and popoverDidClose: real selector. My mistake that this this answer for OS X. – Nikolai Nagornyi Sep 16 '13 at 06:03
Ah, my bad. That makes sense. Still not an answer for iOS. – Jared Egan Sep 16 '13 at 15:17

score -1 · Answer 3 · answered Sep 16 '13 at 04:20

Two things:

1) You want to make sure you are the delegate to the UIPopoverController you are using to show your popover view controller "B". See the docs here: https://developer.apple.com/library/ios/documentation/uikit/reference/UIPopoverControllerDelegate_protocol/Reference/Reference.html

Then you'll want to implement one of those methods, e.g.:

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController {
    // Reload my view controller "A"
}

2) How do you know which row was selected in view controller B? It's possible you're updating some singleton that both view controllers have access to, but a better design pattern might be to create your own protocol and for view controller "A" to conform to it. In that case view controller B should have a weak delegate property that it sends a message to when the user selects a row. Just look at another class that uses the delegate/protocol pattern to see how it works, you could even look at the .h file of UIPopoverController by CMD + clicking the class name, or CMD + Shift + O to the file name.

score -1 · Answer 4 · answered Sep 16 '13 at 15:36

-1

Cant you just use - (void)viewWillAppear:(BOOL)animated ?

answered Sep 16 '13 at 15:36

AMAN77

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Dismissing Popover and reload parentViewController

4 Answers4