Obj-C - Convert milliseconds to a formatted output string of hours:minutes:seconds with applied padding

TimeFormatter.h

//
//  TimeFormatter.h
//  ElectroDeluxe
//
//  Convert milliseconds to a formatted output string containing hours:minutes:seconds
//  with padding zero.
//
//  Copyright © 2015 srmds. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface TimeFormatter : NSObject

-(NSString *) getFormattedDuration:(NSNumber*)trackDuration;

@end

TimeFormatter.m

//
//  TimeFormatter.m
//  ElectroDeluxe
//
//  Convert milliseconds to a formatted output string containing hours:minutes:seconds
//  with padding zero.
//
//  Copyright © 2015 srmds. All rights reserved.
//

#import "TimeFormatter.h"

@implementation TimeFormatter

-(NSString *) getFormattedDuration:(NSNumber*)trackDuration{
    
    if([trackDuration intValue] < 1000)
        return @"00:00:00";
    
    unsigned long milliseconds = [trackDuration floatValue];
    unsigned long seconds = milliseconds / 1000;
    unsigned long minutes = seconds / 60;
    seconds %= 60;
    unsigned long hours = minutes / 60;
    minutes %= 60;
    
    NSMutableDictionary *timeComponents = [[NSMutableDictionary alloc]initWithCapacity:3];
    
    [timeComponents setObject:[NSNumber numberWithInteger:[@(hours) integerValue]] forKey:@"hours"];
    [timeComponents setObject:[NSNumber numberWithInteger:[@(minutes) integerValue]] forKey:@"minutes"];
    [timeComponents setObject:[NSNumber numberWithInteger:[@(seconds) integerValue]] forKey:@"seconds"];
    
    return [self durationStringBuilder: timeComponents];
}

-(NSString *)durationStringBuilder:(NSDictionary *)timeComponents {
    
    int hours = [[timeComponents valueForKey:@"hours"] intValue];
    int minutes = [[timeComponents valueForKey:@"minutes"] intValue];
    int seconds = [[timeComponents valueForKey:@"seconds"] intValue];
    
    NSMutableString * result = [NSMutableString new];
    
    [result appendString:[self setZeroPadding:hours delimiter:false]];
    [result appendString:[self setZeroPadding:minutes delimiter:false]];
    [result appendString:[self setZeroPadding:seconds delimiter:true]];
    
    return result;
}

-(NSString*)setZeroPadding:(int)timeComponent delimiter:(BOOL)delimiter {

    NSMutableString * result = [NSMutableString new];

    if (timeComponent) {
        if(timeComponent < 10){
            if(!delimiter)
                [result appendFormat: @"0%d:", timeComponent];
            else
                [result appendFormat: @"0%d", timeComponent];
        }
        else{
            if(!delimiter)
                [result appendFormat: @"%d:", timeComponent];
            else
                [result appendFormat: @"%d", timeComponent];
        }
        
    } else {
        if (!delimiter)
            [result appendString:@"00:"];
        else
            [result appendString:@"00"];
    }

    return result;
}

@end