如果使用核心数据（布尔类型的属性），则应用崩溃

Question

I addded a new attribute (of type boolean) into my core data model and my data.swift class. I try to run my app after I added the attribute. All works fine. Now I try to work with the new attribute. I wrote some code, which work is working with the attribute. Now I tried a 2nd time to run the app. It's crashing. Does someone knows why?

Answer 1

A Bool is not an object, so it can't be managed. Instead, set the property to an NSNumber .

NSNumber has a property called boolValue that you can get and set to use it as a boolean.

Answer 2

Your problem is that your new DataModel isn't the same as you used when you created the datastore.

So you have to delete your app from your simulator. Then start your app again an it should work.