UIDatePicker select Month and Year

Question

I need a UIDatePicker for selecting Month and Year only. I checked the class reference documents. Looks like UIDatePicker is a UIView.

Answer 1

I just reset the day to first of the month when the value change event happens as below. So When the user selects a day, it scrolls back to 1st. I use following for selecting Start date (month & year).

-(void) resetDay {

 NSDate *currentDate  = [startDatePicker date];
 NSCalendar *gregorian = [[NSCalendar alloc]  initWithCalendarIdentifier:NSGregorianCalendar];
 NSDateComponents *componentsYear = [gregorian components:(NSYearCalendarUnit| NSMonthCalendarUnit) fromDate:currentDate];
 NSInteger yearNum = [ componentsYear year];
 NSInteger monthNum = [componentsYear month];
 NSLog(@"Month %d, Year %d", monthNum, yearNum);

 NSDateComponents *componentStartDate = [[NSDateComponents alloc] init];
 [componentStartDate setDay:1];
 [componentStartDate setMonth:monthNum];
 [componentStartDate setYear:yearNum];
 NSDate *startDate = [gregorian dateFromComponents:componentStartDate];

 [startDatePicker setDate:startDate animated:YES];
 [componentStartDate release];
 [gregorian release];
}

For selecting the End Date (month & year) it is little bit longer, because I wanted to set the day to 31st or 30th of the month selected.

-(NSInteger) findDaysInYear {
    NSDate *currentDate = [NSDate date];
    NSCalendar *gregorian = [[NSCalendar alloc]  initWithCalendarIdentifier:NSGregorianCalendar];


    NSDateComponents *componentsYear = [gregorian components:(NSYearCalendarUnit)   fromDate:currentDate];
    NSInteger yearNum = [ componentsYear year];

    NSDateComponents *componentStartDate = [[NSDateComponents alloc] init];
    [componentStartDate setDay:1];
    [componentStartDate setMonth:1];
    [componentStartDate setYear:yearNum];
    NSDate *startDate = [gregorian dateFromComponents:componentStartDate];
    NSLog(@"Start date set to %@", startDate);

    NSDateComponents *componentEndDate = [[NSDateComponents alloc] init];
    [componentEndDate setDay:31];
    [componentEndDate setMonth:12];
    [componentEndDate setYear:yearNum];

    NSDate *endDate = [gregorian dateFromComponents:componentEndDate];
    NSLog(@"End date set to %@", endDate);

    NSUInteger unitFlags = NSDayCalendarUnit ;
    NSDateComponents *componentsDay = [gregorian components:unitFlags   fromDate:startDate    toDate:endDate options:0];
    NSInteger days = [componentsDay day] +1;
    NSLog(@"Number of days in the year:%d, is %d", yearNum,days);
    [componentEndDate release];
    [componentStartDate release];
    [gregorian release];
    if (days != 365 && days != 366) {
        return 366;
    }
    return days;
}
-(NSInteger) findDaysInMonth:(NSInteger) monthNum {

    NSInteger days = 30;


    switch (monthNum) {
        case 1:
            days = 31;
            break;
        case 2:
            if([self findDaysInYear] == 366)        days = 29;
            else days = 28;
            break;
        case 3:
            days = 31;
            break;
        case 4:
            days = 30;
            break;
        case 5:
            days = 31;
            break;
        case 6:
            days = 30;
            break;
        case 7:
            days = 31;
            break;
        case 8:
            days = 31;
            break;
        case 9:
            days = 30;
            break;
        case 10:
            days = 31;
            break;
        case 11:
            days = 30;
            break;
        case 12:
            days = 31;
            break;
        default:
            break;
    }
    return days;

}

-(void) resetDay {

    NSDate *currentDate  = [endDatePicker date];
    NSCalendar *gregorian = [[NSCalendar alloc]  initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *componentsYear = [gregorian components:(NSYearCalendarUnit| NSMonthCalendarUnit)  fromDate:currentDate];
    NSInteger yearNum = [ componentsYear year];
    NSInteger monthNum = [componentsYear month];

    NSDateComponents *componentStartDate = [[NSDateComponents alloc] init];
    [componentStartDate setDay:[self findDaysInMonth:monthNum]];
    [componentStartDate setMonth:monthNum];
    [componentStartDate setYear:yearNum];
    NSDate *startDate = [gregorian dateFromComponents:componentStartDate];

    [endDatePicker setDate:startDate animated:YES];
    [componentStartDate release];
    [gregorian release];
}