Looking for code to ask "Please rate this app"

I am looking for code to ask the user if they want to rate the app, after they have been using it for X amount of time. I have seen this in some of the big g开发者_如何学编程aming apps.

This is widely used for prompting to rate apps.

http://arashpayan.com/blog/2009/09/07/presenting-appirater/

Edit:

Getting Started

Add the Appirater code into your project 
Add the CFNetwork and SystemConfiguration frameworks to your project 
Call [Appirater appLaunched:YES] at the end of your app delegate's application:didFinishLaunchingWithOptions: method. 
Call [Appirater appEnteredForeground:YES] in your app delegate's applicationWillEnterForeground: method. 
(OPTIONAL) Call [Appirater userDidSignificantEvent:YES] when the user does something 'significant' in the app. 
Finally, set the APPIRATER_APP_ID in Appirater.h to your Apple provided software id.

https://github.com/nicklockwood/iRate is also another library to do the same thing.

RMRecurringURLAlert does what you want.