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2011-11-08T00:05:56.260
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wow, you posted your whole app! No offense intended but you need to learn how view controllers work. I strongly recommended digging into the Apple docs. You may have other issues but start with this. You should never sending <code>viewWillDisappear</code> explicitly. Your view controller will receive that message from the OS. You should make at least the following changes: <pre><code>- (void) finishedEditing { // DON'T DO THIS // [self viewWillDisappear: YES]; // DO THIS contact.name = contactName.text; contact.mobile = [NSNumber numberWithFloat: [contactMobile.text floatValue]]; NSManagedObjectContext *context = contact.managedObjectContext; NSError *error = nil; [context save: &error]; [self.navigationController popViewControllerAnimated:YES]; } </code></pre> You should commit changes to the data model based on the appropriate user action or app trigger. Being notified that the view will disappear is not a good place to do that. Also, you should not pop the navigation controller stack from viewWillDisappear.. So, all the stuff you did in <code>viewWillDisappear</code> shouldn't happen there. <pre><code>- (void)viewWillDisappear:(BOOL)animated { // contact.name = contactName.text; // contact.mobile = [NSNumber numberWithFloat: [contactMobile.text floatValue]]; // NSManagedObjectContext *context = contact.managedObjectContext; // NSError *error = nil; // [context save: &error]; // [self.navigationController popViewControllerAnimated: YES]; } </code></pre>
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1. PONSUnknownKeyException xcode navigation controller
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1. COThank you for the response. Im very new to IPhone programming. Thanks for the help but its still throwing the exception.
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2. COyou clearly have other issues. the error specifically is referring to a reference to the key `navigationController` on your app delegate object. Your app delegate doesn't have `navigationController` as a property. The code you posted doesn't show this. You should look in your NIB files and see if there is anything references the non-existent `navigationController` outlet on your app delegate.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.