iOS/iPhone Image View and NSURLConnection ActivityIndicator Progress

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

#import <UIKit/UIKit.h>

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

@property(nonatomic,assign) NSMutableData *receivedData;

@end

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

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize receivedData;


- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    NSURLRequest *theRequest =
    [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.thaicreate.com/url/girl.jpg"]
                     cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                 timeoutInterval:10.0];

    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    
    [loading startAnimating];
    
    if (theConnection) {
        self.receivedData = nil;
    } else {
		UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Failed in viewDidLoad"  delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
		[connectFailMessage show];
		[connectFailMessage release];
    }
    
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    receivedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    sleep(1);
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    
    [connection release];
    [receivedData release];
    
    // inform the user
    UIAlertView *didFailWithErrorMessage = [[UIAlertView alloc] initWithTitle: @"NSURLConnection " message: @"didFailWithError"  delegate: self cancelButtonTitle: @"Ok" otherButtonTitles: nil];
    [didFailWithErrorMessage show];
    [didFailWithErrorMessage release];
	
    //inform the user
    NSLog(@"Connection failed! Error - %@", [error localizedDescription]);
    
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    if(receivedData)
    {
        NSLog(@"%@",receivedData);
        
        UIImage *image = [[UIImage alloc] initWithData:receivedData];
        
		//self.image = image;
		[self performSelectorOnMainThread:@selector(setImageView:) withObject:image
                            waitUntilDone:YES];
        
		[image release];
        [loading stopAnimating];
        [loading setHidden:TRUE];
    }
    
                                                 
    // release the connection, and the data object
    [connection release];
    [receivedData release];
}

// Display Image
- (void) setImageView:(UIImage *) img
{
    imgView.image = img;
}

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

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