Calling method to view controller delegate, won't dismiss modal view - objective-c

Question

I have the following simple view controller class set up
#protocol ThermoFluidsSelectorViewControllerDelegate;
#interface ThermoFluidsSelectorViewController : UIViewController <UITextFieldDelegate>
#property (weak, nonatomic) id <ThermoFluidsSelectorViewControllerDelegate> delegate;
// user hits done button
- (IBAction)done:(id)sender;
#end
#protocol ThermoFluidsSelectorViewControllerDelegate <NSObject>
-(void) didFinishSelection:(ThermoFluidsSelectorViewController *)controller fluidID: (NSString *)fluidID;
#end
the 'didFinishSeletion: fluidID:' method is defined in the master view controller and should dismiss the selector view controller when called. When the done button is pressed the following method is called:
- (IBAction)done:(id)sender
{
[[self delegate] didFinishSelection:self fluidID:nil];
}
the 'done:' method gets called (checked with an alert) but 'didFinishSelection...' is not getting called so the view will not revert back to the main screen. Any ideas?

Answer 1

It sounds like you have not assigned your delegate in your master view controller.
You should have something like this in your master view controller which sets up the delegate:
ThermoFluidsSelectorViewController *view = [[ThermoFluidsSelectorViewController alloc] init];
view.delegate = self;
here you can see I create the view, then set the delegate of the view back to myself.
If you are not creating the Thermo... view controller programatically, but have used a storyboard, then you can set the delegate in the prepareForSegue: method of your master view controller:
// Do some customisation of our new view when a table item has been selected
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure we're referring to the correct segue
if ([[segue identifier] isEqualToString:#"MySegueID"]) {
// Get reference to the destination view controller
ThermoFluidsSelectorViewController *cont = [segue destinationViewController];
// set the delegate
cont.delegate = self;
Hope this helps.