iOS - Rate the App in AppStore

Download the File  -   https://github.com/nicklockwood/iRate/archive/master.zip

Unzip the iRate-master.zip --> Click the iRate-master folder  --> Click the iRate Folder --> Select the all files into your project.
In iRate Folder has Files are

        1. iRate.bundle
        2. iRate.h
        3. iRate.m

Step 1:
Create a new project --> Name as rate me & tick the use automatic reference counting 

                                                   (or)

Existing Project --> select the Project --> click the target(Project Name) --> Selct the buildPhases --> Compiled Sources --> double click the iRate.m --> Type the -fobjc-arc

Step 2:
AppDelegate.m

#import "iRate.h"

+ (void)initialize

{

    //configure iRate

    [iRate sharedInstance].applicationBundleID = @"com.company.appname";// Replace this

    [iRate sharedInstance].usesUntilPrompt = 4;

    [iRate sharedInstance].previewMode = YES;

}

Button Coding to Rate your App:

-(IBAction)action_rate:(id)sender

{

    [[iRate sharedInstance] openRatingsPageInAppStore];

}