Question

So I have an app, and in the app there is a tableView, I have a uinavigationbarbutton that presents a modal viewController. When the user hits a go button in the modal interface, I want it dismiss the modal view and get some of the information in the modal view. I will than put that info in the tableView. To do this, I wrote a custom delegate, but it doesn’t work. I included my code below. Thanks for any help.

TrackerMainViewController.h //the tableView

#import "NewItemViewController.h"
@interface TrackerMainViewController : UITableViewController <UITableViewDelegate, DetailDelegate>

TrackerMainViewController.m

 -(void)finishedAddingFoodItemFromDetail:(NSDate *)date whatWasEaten:(NSString *)whatFood whichMeal:(NSString *)meal {
     NSLog(@"in delegate method here");
     [self.tableView reloadData];
     [self dismissModalViewControllerAnimated:YES];
}

NewItemViewController.h // the modal view

@protocol DetailDelegate <NSObject>
-(void)finishedAddingFoodItemFromDetail:(NSDate *)date whatWasEaten:(NSString *)whatFood whichMeal:(NSString *)meal;
@end

@interface NewItemViewController : UIViewController {
     id <DetailDelegate> _delegate;
}
@property (nonatomic, retain) id <DetailDelegate> delegate;
@end

NewItemViewController.h

@implementation NewItemViewController
@synthesize delegate = _delegate;
//the go button in the modal view

- (IBAction)Go:(id)sender {
[self.delegate finishedAddingFoodItemFromDetail:[NSDate date] whatWasEaten:@"chicken" whichMeal:@"breakfast"];
}

I put a log in both the go button and in the implementation of the delegate in the tableview, but only the go log is being called.

Thanks

Answer 1

In the code you posted, you dont set the delegate. You need to set it similar to this detailView.delegate = self, otherwise it is nil. You can send messages to a nil-object without any warning and error, nothing will happen.