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Editorial Team
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Asked: 2026-06-05T19:55:33+00:00

I have been struggling with Core Data sigh so I decided to work this

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I have been struggling with Core Data sigh so I decided to work this this Apple Core Data tutorial. I am at the point in the tutorial where it asks me to build the project I have put together so far. So I am presently right here in the tutorial. When I am building the project I am getting the following error:

Type of property 'managedObjectContext' ('NSManagedObjectContext *') does not match type of ivar 'managedObjectContext' ('MSManagedObject *__strong')

RootViewController.m

Ivar is declared here

That’s what I am getting in error window.

Here are what my files look like,

RootViewController.h http://pastie.org/4111206

RootViewController.m http://pastie.org/4111216

AppDelegate.h http://pastie.org/4111222

AppDelegate.m http://pastie.org/4111227

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1 Answer

  1. Editorial Team

    Your ivar is declared incorrectly. In RootViewController.h,

    NSManagedObject *managedObjectContext;

    should be written, as the error complains,

    NSManagedObjectContext *managedObjectContext;

    And actually, with the modern run-time, for quite a while it’s been unnecessary (and usually ill-advised) to explicitly declare backing ivars for @synthesize‘d properties. So you can just delete the ivar line entirely and let the compiler make an ivar for you.

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