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POmanagedContextObject passing error in objective-c
 

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  1. POmanagedContextObject passing error in objective-c
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    <p>I have this managedContextObject I want to pass from a view controller to another. From a view controller called CatalogueViewController this works fine with no problem. And this is the no-problem code:</p> <pre><code>- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@"AddItem"]) { UINavigationController *navigationController = segue.destinationViewController; DetailsItemViewController *detailsItemViewController = (DetailsItemViewController *) navigationController.topViewController; detailsItemViewController.delegate = self; detailsItemViewController.productToAdd = sender; //Mando il prodotto che ha provocato la segue (fatto manulamente sopra in didSelectRowAtIndexPath). detailsItemViewController.index = [prodotti.productsArray indexOfObject:sender]; detailsItemViewController.managedObjectContext = self.managedObjectContext; //Gli passo anche l'oggetto per registrare i prodotti aggiunti in core data. NSLog(@"::::::::::::INDICE DELL'OGGETTO: %d", [prodotti.productsArray indexOfObject:sender]); //delegato, vado ad aggiungere i metodi delegati } } </code></pre> <p>And the line <strong>detailsItemViewController.managedObjectContext = self.managedObjectContext; has no problem.</strong></p> <p>BUT! When I try to pass <strong>SAME THING</strong> to <strong>THE SAME detailsItemViewController</strong> (the only difference is that I do that from another view controller called CartViewController) and this is the code:</p> <pre><code>- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@"EditItem"]) { UINavigationController *navigationController = segue.destinationViewController; DetailsItemViewController *detailsItemViewController = (DetailsItemViewController *) navigationController.topViewController; detailsItemViewController.productToEdit = sender; //Mando il prodotto che ha provocato la segue (fatto manulamente sopra in didSelectRowAtIndexPath. detailsItemViewController.managedObjectContext = self.managedObjectContext; //Gli passo anche l'oggetto per registrare i prodotti aggiunti in core data. //Mi metto in ascolto di una notifica tramite il Notification Center. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(objectEditedFromDetailsViewController:) name:@"ObjectEdited" object:nil]; } } </code></pre> <p>on the line: <strong>detailsItemViewController.managedObjectContext = self.managedObjectContext;</strong> Xcode is giving me this error message: </p> <blockquote> <p>[...]CartViewController.m: error: Semantic Issue: <strong>Property 'managedObjectContext' not found on object of type 'DetailsItemViewController *'</strong></p> </blockquote> <p>that obviously is not true!</p> <p>WHY?!</p> <p>Just to be clearer:</p> <p><strong>I make the #import of DetailsItemViewController.h in CartViewController:</strong></p> <pre><code>#import "CartViewController.h" #import "Product.h" #import "CartCell.h" #import "CDProduct.h" #import "DetailsItemViewController.h" #import "UIImage+Resize.h" @implementation CartViewController { </code></pre> <p>All the lines but <strong>detailsItemViewController.managedObjectContext = self.managedObjectContext;</strong> work. All this lines work with no problem at all:</p> <pre><code>UINavigationController *navigationController = segue.destinationViewController; // &lt;---- WORKS DetailsItemViewController *detailsItemViewController = (DetailsItemViewController *) navigationController.topViewController; // &lt;---- WORKS detailsItemViewController.productToEdit = sender; // &lt;---- WORKS </code></pre> <p>In fact, for example, if I try to pick up another detailsItemViewController's property it works well! Only if I do <strong>detailsItemViewController.managedObjectContext = self.managedObjectContext;</strong> I get the error from Xcode.</p> <p>And here the DetailsItemViewController.h</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "Product.h" #import "ProductDetails.h" #import "CDProduct.h" //Delegato per lo screen successivo di aggiunta roba nel carrello. @class DetailsItemViewController; @class CatalogueItem; @protocol DetailsItemViewControllerDelegate &lt;NSObject&gt; - (void)detailsViewControllerDidCancel:(DetailsItemViewController *)controller; - (void)detailsViewControllerDidDone:(DetailsItemViewController *)controller didFinishAddingItem:(CatalogueItem *)item; @end //@class Product; //@class ProductDetails; @interface DetailsItemViewController : UIViewController &lt;NSURLConnectionDelegate&gt; @property (nonatomic, weak) id &lt;DetailsItemViewControllerDelegate&gt; delegate; @property (nonatomic, strong) Product *productToAdd; //Li differenzio così capisco quello che devo fare. NB: per chi legge questo codice:productToAdd non indica un oggetto da aggiungere ma un oggetto a cui si può modificare la quantità per aggiungerlo al carrello. @property (nonatomic, strong) CDProduct *productToEdit; @property (nonatomic, strong) ProductDetails *productToShow; //Qui ci metto il prodotto che ricavo da loadProducts. @property (strong, nonatomic) IBOutlet UIImageView *graphicImage; @property (strong, nonatomic) IBOutlet UIImageView *overviewImage; @property (strong, nonatomic) IBOutlet UIStepper *stepper; @property (strong, nonatomic) IBOutlet UILabel *stepperValueLabel; @property (strong, nonatomic) IBOutlet UILabel *productNameLabel; @property (strong, nonatomic) IBOutlet UILabel *priceLabel; //Il prezzo poi lo prendo facendo il parsing di un altra pagina. @property (strong, nonatomic) IBOutlet UILabel *totalPrice; @property (nonatomic, assign) int index; //In questa property ci metto l'indice dell'oggetto passato (productToAdd) in modo sapere che articolo dell'XML parsare. @property (nonatomic, strong) NSMutableData *receivedData; @property (nonatomic, strong) NSManagedObjectContext *managedObjectContext; //Per registrare i prodotti in core data. - (IBAction)cancel; - (IBAction)done; - (IBAction)changeValue:(UIStepper *)sender; @end </code></pre>
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    1. CODoesn't solve your problem, but if `productToEdit` is a NSManagedObject (or subclass) then it already contains a reference to your managed object context, so you don't need to pass it separately (`productToEdit.managedObjectContext`).
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    2. COYep, this doesn't solve my problem BUT this is very useful to know! Thank you very much man, i didn't think about it ^^
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    3. COCan you include the header of DetailsItemViewController in your question?
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