iOS/iPhone Substring / Split / Replace String (Objective-C)

    // SubString
    NSString* input = @"2012-12-12 15:15:34";
    NSString* year  = [input substringWithRange: NSMakeRange( 0, 4)];
    NSString* month = [input substringWithRange: NSMakeRange( 5, 2)];
    NSString* day   = [input substringWithRange: NSMakeRange( 8, 2)];
    NSString* time  = [input substringWithRange: NSMakeRange(11, 8)];
    
    NSString* output = [NSString stringWithFormat:@"%@.%@.%@ %@",day,month,year,time];
    NSLog(@"Substring = %@",output);

    // Split
    NSArray* arr = [@"12-12-2012" componentsSeparatedByString: @"-"];
    //NSString* d = [arr objectAtIndex: 0];
    for (NSString *str in arr)
    {
        NSLog(@"split = %@",str);
    }

    // Replace
    NSString *str = @"Welcome to thaicreate.com";
    str = [str stringByReplacingOccurrencesOfString:@"thaicreate.com" // string
                                         withString:@"https://www.thaicreate.com"]; // replace
    NSLog(@"Replace = %@",str);

//
//  ViewController.h
//  SubStringSplit
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

//
//  ViewController.m
//  SubStringSplit
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    // SubString
    NSString* input = @"2012-12-12 15:15:34";
    NSString* year  = [input substringWithRange: NSMakeRange( 0, 4)];
    NSString* month = [input substringWithRange: NSMakeRange( 5, 2)];
    NSString* day   = [input substringWithRange: NSMakeRange( 8, 2)];
    NSString* time  = [input substringWithRange: NSMakeRange(11, 8)];
    
    NSString* output = [NSString stringWithFormat:@"%@.%@.%@ %@",day,month,year,time];
    NSLog(@"Substring = %@",output);
    
    // Split
    NSArray* arr = [@"12-12-2012" componentsSeparatedByString: @"-"];
    //NSString* d = [arr objectAtIndex: 0];
    for (NSString *str in arr)
    {
        NSLog(@"split = %@",str);
    }
    
    // Replace
    NSString *str = @"Welcome to thaicreate.com";
    str = [str stringByReplacingOccurrencesOfString:@"thaicreate.com"
                                         withString:@"https://www.thaicreate.com"];
    NSLog(@"Replace = %@",str);
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end