CoreData：error：无法调用NSManagedObject类上的指定初始化程序 [英] CoreData: error: Failed to call designated initializer on NSManagedObject class

问题描述

我有一个关于CoreData的一个小问题。我想插入一个新的Object，所以我先创建一个。这是通过代码：

I have a little damn problem with CoreData. I want to insert a new Object, so I first have to create one. This is done by that code:

Challenges *newChallenge = [[Challenges alloc] init];
[newChallenge setName:@"TestChallenge"];
[newChallenge setRounds:[[NSNumber alloc] initWithInt:12]];
[newChallenge setShots:[[NSNumber alloc] initWithInt:5]];
[newChallenge setDate:[NSDate date]];

但是在alloc init之后，我得到这个错误：

But however after the alloc init I get this error:

CoreData: error: Failed to call designated initializer on NSManagedObject class 'Challenges'

解决问题是什么？

推荐答案

我认为问题是， code> NSManagedObject 类，您需要指定的初始化程序：

I think the problem is that Challenges is a NSManagedObject class and you need the designated initializer:

initWithEntity:insertIntoManagedObjectContext:

而不是

Challenges *newChallenge = [[Challenges alloc] init];

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