if the user is registering first time in my app he has to signup otherwise he has to do just login.what is the condition we use to check whether user is new or existing user.
I’m following this link
By using this you can get whole list of users and then you can compare
Parse has a complete run down of how to implement this into your project. Assuming your coding for objective c look at their documentation and their own tutorial for signing up or signing in users