dismissViewControllerAnimated calling method in another view

Question

I am new to iOS Programming and now i have a problem.

There is a login screen that use [self presentViewController:loginview animated:YES completion:nil]; to show it out in MasterViewController.

And now i want to call a method (reload data) after [self dismissViewControllerAnimated:YES completion:nil]

this is my code:

[self dismissViewControllerAnimated:YES completion:^ {
   [self getPostData];                 // Reload Data
   [self.tableView reloadData];        // Reload Data
}];

but it is not working.

(the reload method is in the MasterViewController)

Anyone can help me?

What's `self`? Should it be the same object in your completionhandler? — Larme, May 07 '14 at 10:52
There are two ways, 1. Use `NSNotificationCenter` to notify a message to MasterViewController to call the above method defined in MasterViewController only. 2. Use `Protocol` — iphonic, May 07 '14 at 10:59
@iphonic sorry but can you say clearer about how to use `NSNotificationCenter`? Thanks — He Yifei 何一非, May 07 '14 at 11:12
Do you wants to call method of one class from another class?? — Mohit, May 07 '14 at 11:25
@Arefly checkout this http://stackoverflow.com/questions/7688495/ios-call-a-method-in-another-class — Mohit, May 07 '14 at 11:29

score 9 · Accepted Answer · answered May 07 '14 at 11:26

9

You can use NSNotificationCenter for your problem.

Define a NSNotification in your MasterViewController viewDidLoad like below

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

And then define the method as below

-(void)closeModal:(NSNotification *)notification{
    UIViewController *controller=(UIViewController *)notification.object;

    [controller dismissViewControllerAnimated:YES completion:^ {
         [self getPostData];                 // Reload Data
         [self.tableView reloadData];        // Reload Data
    }];

}

And at last from your other controller from where you are actually trying to dismiss your controller use code below

[[NSNotificationCenter defaultCenter] postNotificationName:@"CloseModal" object:self];

answered May 07 '14 at 11:26

iphonic

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i've try the code but it do not have any change to the APP (it still not reload the data) – He Yifei 何一非 May 07 '14 at 11:29
but are you sure it is the only way? i hope there are some easiler ways and this one looks like a trick not a proper way :p – He Yifei 何一非 May 07 '14 at 11:33
No this is one way, but as I said you can use `Protocols` too, or you can create a parent controller property in your other controller and pass MasterViewController reference and dismiss by calling a function in Master. – iphonic May 07 '14 at 11:38
um... seems more difficult for me XD i will just use your solution. THX! – He Yifei 何一非 May 07 '14 at 11:39

2intor · Answer 2 · 2014-05-07T12:07:48.213

1

what you should do is basically call method on presenting view controller as below

[(MasterViewController*)self.presentingViewController reloadData];

edited May 07 '14 at 12:07

answered May 07 '14 at 11:04

2intor

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but it says No visible @interface for 'UIViewController' declares the selector 'reloadData' – He Yifei 何一非 May 07 '14 at 11:08

score 0 · Answer 3 · answered Nov 16 '15 at 10:45

You can call the presentingViewController's methods which updates the Presenting view.

for example: I have a modal view which can be launched from multiple Views. And all the presenting views have the view reloading code within view will appear.

Add the below code before dissmissing the modal view.

        [self.presentingViewController viewWillAppear:YES];

[self dismissViewControllerAnimated:YES completion:Nil];

dismissViewControllerAnimated calling method in another view

3 Answers3