Why do you need to migrate?
When you release an app and add new features, there will be a time you need to update you persistent store. This is easy to do when you are in a development stage, because you can just delete your app and the persistent store will be re-generated. But when you are live and people have downloaded your app, you need to be careful. They won’t like it if suddenly their saved data has disappeared!
Continue reading How to do a lightweight Core Data migration
There is a nice API for face/person recognition on the internet at http://www.face.com/.
Their API provides quite a lot of interesting data, such as
- Position of the eyes
- Position of the nose
- Position of the mouth (right, center, left bounds)
- Yaw/roll/pitch rotation of the detected head
- Attributes: gender, wearing glasses, smiling, mood, …
And the best of all … it’s a free service which gives you 5000 calls an hour to their API which is more than enough for a little experiment.
Continue reading iOS Face recognition