Example of how to left pad in Objective-C

main.m

//
//  main.m
//  testcode
//
//  Created by Ron Sims II on 6/6/16.
//  Copyright © 2016 Ron Sims II. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
  @autoreleasepool {
      // insert code here...
    NSInteger foo = 142;
    NSString *formattedFoo = [NSString stringWithFormat:[NSString stringWithFormat:@"STJ%%0%ddT1", 4], foo];
      NSLog(@"Store Number: %@", formattedFoo);
  }
    return 0;
}