轻量级迁移时我的应用程序崩溃

Question

I have created a new version of Core Data Model with a non-optional 'new attribute'. When I run my app in previous build. My app crashes.

can you give me any suggestion?

Answer 1

Just set the default value of your 'new attribute'. If you don't set default value then the 'new attribute' will be assigned by a nil value which eventually crashes your app.

 NSString *yourAttribute = @"Default";