iOS/iPhone Image URL Display an Image from URL (Website)

     NSURL *url = [NSURL URLWithString:@"https://www.thaicreate.com/url/girl.jpg"];
     NSData *data = [NSData dataWithContentsOfURL:url];
     UIImage *img = [[UIImage alloc] initWithData:data];
     imgView.image = img;

- (IBAction)btnShowImage:(id)sender {
    
     NSURL *url = [NSURL URLWithString:@"https://www.thaicreate.com/url/girl.jpg"];
     NSData *data = [NSData dataWithContentsOfURL:url];
     UIImage *img = [[UIImage alloc] initWithData:data];
     CGSize size = img.size;
     imgView.image = img;
 
}

//
//  ViewController.h
//  imageFromURL
//
//  Created by Weerachai on 12/2/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UIImageView *imgView;
}

- (IBAction)btnShowImage:(id)sender;

@end

//
//  ViewController.m
//  imageFromURL
//
//  Created by Weerachai on 12/2/55 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.
}

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

- (void)dealloc {
    [imgView release];
    [super dealloc];
}

- (IBAction)btnShowImage:(id)sender {
    
    /*
     NSURL *url = [NSURL URLWithString:@"https://www.thaicreate.com/url/girl.jpg"];
     NSData *data = [NSData dataWithContentsOfURL:url];
     UIImage *img = [[UIImage alloc] initWithData:data];
     CGSize size = img.size;
     imgView.image = img;
     */
    
    NSData *receivedData = [[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://www.thaicreate.com/url/girl.jpg"]] retain];
    UIImage *image = [[UIImage alloc] initWithData:receivedData] ;
    
    imgView.image = image;
    
}

@end