If you were to show an app rating alert for active users of your app who have used your app at least on 3 unique days in the last 5 days. Please provide code for it.

RateMyAppLogic.m

// The way I would approach this problem would be to save a set of two distinct dates to 
// NSUserDefaults and if these three days (the two days from the set plus today's third date) lie within the last five days,
// I'll show the alert.  If we have two dates in the set, replace the oldest with the newest/current date.

// I'm using NSSet because it's distinct dates, versus an array where we might have duplicate dates.

// I'm making JetDate as a subclass of NSDate where the time component of NSDate (02-17-2015 00:00:00 GMTz) 
// is dropped and only the date is considered

- (BOOL) shouldShowRatingAlert
{
    NSMutableSet *dateSet = [[NSUserDefaults standardDefaults] getDateSet]; // getDateSet is a custom method which handles unarchiving NSDates!
    
    JetDate *currentDate = [JetDate date];
    
    // check to make sure today's date isn't already in the date set...
    // if so, we either displayed the rating alert or we didn't, but we already looked at this
    
    // if there's less than 2 dates in the dateset, we don't need to show the rating alert
    if([dateSet count] < 2)
    {
       // add today's date
       [dateSet addObject: currentDate];
       return NO;
    }

    // if we are here, we have two dates and today's use would be the third date
    // calculate the distance between the oldest date and today's date
    const NSTimeInterval fiveDaysTimeInterval = 60 * 60 * 24 * 5; // 60 seconds * 60 minutes * 24 hours * 5 days
    
    NSMutableArray *dateArray = [[dateSet allObjects] mutableCopy]; // to get the date set as an array
    NSTimeInterval firstDateTimeIntervalSinceNow = [currentDate timeIntervalSinceDate: [dateArray objectAtIndex:0]];
    NSTimeInterval secondDateTimeIntervalSinceNow = [currentDate timeIntervalSinceDate: [dateArray objectAtIndex:1]];
    
    if(firstDateTimeIntervalSinceNow > secondDateTimeIntervalSinceNow)
    {
       [dateArray replaceObject: [dateArray objectAtIndex:0] with: currentDate];
    } else {
       [dateArray replaceObject: [dateArray objectAtIndex:1] with: currentDate];
    }
    
    // convert array back into set and save it...
    NSSet *newSet = [[NSSet alloc] initWithArray: dateArray];
    
    [[NSUserDefaults standardDefaults] setDateSet: newSet]; // replaces the previous date set
    
    if(firstDateTimeIntervalSinceNow < fiveDaysTimeInterval) && (secondDateTimeIntervalSinceNow < fiveDaysTimeInterval)
    {
        // if the user has never seen the rating dialog before, or simply clicked on the "remind me later" button, that's
        // when we should display the rating dialog
        NSNumber *shouldShowRatingLater = [[NSUserDefault standardUserDefaults] objectForKey: @"RemindMeLater"];
        
        // if RemindMeLater returns false, the rating dialog has been seen before and the user
        // never wants to see it again...
        if((shouldShowRatingLater == nil) || ([shouldShowRatingLater boolValue] == true))
        {
           return YES;
        }
    }

    return NO;
}

- (IBAction) ratingButtonsTouched: (UIButton *) buttonTouched
{
   // if the user clicks YES or NO, set "RemindMeLater" to "false" in NSUserDefaults
   
   // if the user clicks "Remind me later", set "RemindMeLater" to "true" in NSUserDefaults

}