how to increment month and year from calendar in ios - ios

Question

i am trying to increment date and year from calendar, but it is incrementing only one value which means (it is incrementing from jan to feb, but it is not incrementing after feb) my requirement is to incrementing upto 12 month and also simultaneously year has to increment. could you please tell me how to resolve this issue this is my code
- (IBAction)right:(id)sender {
[datearray removeAllObjects];
NSCalendar *cal = [NSCalendar currentCalendar];
date = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"MMM YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar.text=stringFromDate;
NSString *y1=yar.text;
NSArray * arr = [y1 componentsSeparatedByString:#" "];
NSString *m=arr[0];
NSString *yy=arr[1];
spinner = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
spinner.mode = MBProgressHUDModeCustomView;
[spinner setLabelText:#"Loading....."];
[spinner setLabelFont:[UIFont systemFontOfSize:15]];
[spinner show:YES];
//[self.coutweek setText:[NSString stringWithFormat:#"%d",week]];
NSString *urlString = [NSString stringWithFormat:#"http://edvancepreschoolsadminpanel.com/viverobranch/json/json_lunch.php?key=agile89rise98&food=%#&month=%#&year=%#&username=%#",scl,m,yy,temp];
NSLog(#"the url string==%#",urlString);
NSURL *url = [NSURL URLWithString:urlString];
NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
NSLog(#"the str==%#",jsonString);
NSDictionary *results = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:0 error:nil];
NSLog(#"%#",results);
luncharray = [[NSMutableArray alloc]init];
NSArray *array=[results objectForKey:#"lunch_menu"];
for (int i=0; i<[array count]; i++) {
NSString *dat =[[array objectAtIndex:i]objectForKey:#"date"];
NSString *mon =[[array objectAtIndex:i]objectForKey:#"month"];
NSString *yea =[[array objectAtIndex:i]objectForKey:#"year"];
NSString *luh =[[array objectAtIndex:i]objectForKey:#"food"];
NSString *tim =[[array objectAtIndex:i]objectForKey:#"time"];
ipadlunch *myimg =[[ipadlunch alloc]initWithdat:dat andmon:mon andyea:yea andlunch:luh andtime:tim];
NSLog(#"%#",myimg);
[luncharray addObject:myimg];
// NSLog(#"the field==%#",videoarray1);
}