Rate is a library to help you promote your iPhone apps by prompting users to rate the app after using it for a few days. This approach is one of the best ways to get positive app reviews by targeting only regular users (who presumably like the app or they wouldn't keep using it!).

Supported build target - iOS 9.0 (Xcode 7.3.1)

The Rate class is highly decoupled from functionalities like URL opening, alert presentation and data persistence: the class will only take care of the logic needed to calculate if the rate app prompt should be shown to the user or not.

To inject the dependencies, three protocols are used.

This protocol is simply used to describe an object that will contain the entire setup for the Rate class, that is, duration values, texts, and the App Store url string for the app.

This protocol is used by Rate to handle data persistence: the type that will be extended with this protocol should be able to save a retrieve objects of type Int, Bool, String and NSDate in correspondence to some String key. It should also be able to reset those values.

Because the data that will be saved is not complex, nor huge in size, NSUserDefaults could be good candidate to be extended with this protocol.

This protocol describes a generic type that can handle the opening of NSURL objects; the protocol is designed to make UIApplication extendable with no additional work, you just need to add a empty extension to UIApplication like this:

extension UIApplication: URLOpenerType {}