CoreData錯誤如何將核心數據寫回

我只是試圖圍繞核心數據包頭。我已經設法加載一些數據到我applicationDidFinishLaunching，但現在我想做一些更復雜的事情。當我從視圖控制器B退回到viewController A時，我想將recipeName從B發送回A，然後將其寫入核心數據。我得到這個錯誤：CoreData錯誤如何將核心數據寫回

CoreData: error: Failed to call designated initializer on NSManagedObject class 'Recipe' 2013-11-01 19:10:07.886 RecipesWithCore[96409:70b] -[Recipe setRecipeName:]: unrecognized selector sent to instance 0x8c8cf40 2013-11-01 19:10:07.890 RecipesWithCore[96409:70b] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Recipe setRecipeName:]: unrecognized selector sent to instance 0x8c8cf40'

這是我unwindToRecipes：

-(IBAction) unwindToRecipes:(UIStoryboardSegue *)segue{ 
    DBKAddRecipeViewController *source = [segue sourceViewController]; 

    NSString *rn = source.recipe.recipeName; 
    if (recipe != nil){ 
     //Add the recipe to coredata 

     NSManagedObjectContext *context = [self managedObjectContext]; 
     NSManagedObject *newRecipe = [NSEntityDescription 
            insertNewObjectForEntityForName:@"Recipe" 
            inManagedObjectContext:context]; 

     [newRecipe setValue:rn forKey:@"recipeName"]; 

    } 
}

來源

2013-11-01 user1657563

看起來像您的'RecipeName'不是您的託管對象子類的屬性... –

看來insertNewObject返回Recipe類，而不是一個NSManagedObject。檢查你的Recipe類，並確保你的@interface中有正確的聲明，在@implementation中也有@dynamic recipeName。同時檢查您的託管對象模型並確保屬性名稱的確是recipeName。

來源

2013-11-02 09:25:56 Mundi

CoreData錯誤如何將核心數據寫回

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