采用X代码4.2,我用表格格式模板制作了新的标识。 出于某种原因,这一模板没有给你列入核心数据的选择,因此,我不得不人工添加这一模板。
然而,当我掌握情况时,我发现这一错误:
Cannot create an NSPersistentStoreCoordinator with a nil model
我如何使这一模式变得不成熟? 我建立了模型.xcdatamodeld,并增加了一个具有属性的实体(Cat)。
Also, I want to have the app begin with 5 cats for example, but the user will be able to create more cats. Where/How do I create the original 5 cats? It doesn t seem logical to create them every time the app starts, but how can you create them in the first place?
在你试图建立一个持续的仓库协调员之前,你需要立即采用一种模式。 你们可以这样做,其中一种方法是:+合并的ModelFromBundles:。 请注意,如果你采用这种方法,就会寻找模型的主要障碍,这或许是你想要的。
为了向仓库提供一些初步数据,你有一些选择。 当你开始并重新设立核心数据组时,你或许会寻找一个现有的固定储存库。 如果你发现的话,你就能够创建老板,给协调员增加,并着手进行。 如果找不到,一种选择是建立一个新的仓库,并在方案上增加一些物体。 另一种选择是,在贵轴心中保存一个预先储存的永久存放文件,然后打开。 三分之一可能读到网络服务器的缺省数据,并用于新储存。
固定如下:
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"Model" withExtension:@"momd"];
“示范”是“TEMP”。
我仍然不知道如何制造5个物体。
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