多用户的最佳实践：核心数据或NSUserDefaults

Question

I'm developing an app that can have multiple users. I mean, when a user downloads the app, he'll have 1 user ( default ), but he can add more users for his parents/sons/wife/etc. And each user will have his own data.

So my question is: What is the best way to handle these users' data ? I was thinking about using Core Data but i 'think' it's really complicated to add a new attribute to the Users entity ( i'm not sure! ). So, now i'm thinking about using NSUserDefaults ( this might be less complicated.. ).

I hope you can help me with this, even if i have to use/do something else.

Thank you, Bader Al-Rasheed

Answer 1

Do not use NSUserDefaults for data. Maybe one string here and there, but NEVER an entire data model.

As for building this with Core Data, it is fairly straightforward. You need to create a User entity with all necessary attributes and then you can create, insert, update, and delete your records using standard Core Data.

I made an example application that uses CoreData. Feel free to check it out: https://github.com/Jakenberg/CoreDataExample

Answer 2

Is there any overlap between users' data? If not, then use a separate datastore for each user. You could use NSUserDefaults to keep track of who the current user is, and then point your NSPersistentStoreCoordinator to the appropriate file when the user changes. Use a different URL for each user in the call to NSPersistentStore 's initWithPersistentStoreCoordinator:configurationName:URL:options .