CODEWITHSUNDEEP
iphoneobjective-cxcodeuiviewmethods
Nlks
Nlks

Reputation: 45

How to call a method in another view when controller is dismissed

Basically the problem I am having is I am unable to call a method in my Main view controller(called Recorder) from another view called Table.

The table view is loaded as a Modalview controller(presentmodalViewController) from Recorder when the user clicks on a button. The table view lets my users change from setting 1 to setting 2 and has a done button (which calls dismissmodalviewcontroller) and returns the user to the main view(Recorder).

What I want is to call a method in Recorder when the done button is clicked on Table View. This method is called Changeview and changes the setting. I am currently unable to call this method properly.

The current code I have is:

changeView method

- (void)changeView
{

    [levelsView changeView];

}

TableViewController interface file

RecorderViewController*recorderViewController;

@property (nonatomic, retain) RecorderViewController *recorderViewController;

TableViewController implementation file

@synthesize recorderViewController;

    - (void)viewWillDisappear:(BOOL)animated
    {
        [super viewWillDisappear:animated];
        [recorderViewController changeView];

    }

Method called when Done button is pressed

- (IBAction) Switch: (id) sender { 

 [self dismissModalViewControllerAnimated:YES];

}

The current code does not give me any errors but it also does not change the setting. I have also tried to setup notifications with no luck. Any insight into this?

Upvotes: 1

Views: 2112

Answers (1)

Scott Forbes
Scott Forbes

Reputation: 7417

Are you setting the value of recorderViewController when you initialize the tableViewController (i.e., are you setting tableViewController.recorderViewController = self in your Recorder class)? If not, then your call to [recorderViewController changeView] is sending a message to nil – which doesn't crash, but it doesn't do anything either.

As an aside, passing your TableViewController a reference to your RecorderViewController is probably not the best way for two controllers to communicate: You may want to consider using NSNotificationCenter, or passing a model object and using Key-Value Observing.

Upvotes: 1

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