iPhone - How to drag and drop images in screen?

How to Drag and Drop images using iphone SDK? Following example illustrates a simple example.

Screen Shot

Code

//

//  DragImageViewController.h

//  DragImage

//

//  Created by Raja T S Sekhar on 3/9/11.

//  Copyright 2011 __MyCompanyName__. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface DragImageViewController : UIViewController {

IBOutlet UIImageView *imageView;

}

@end

//

//  DragImageViewController.m

//  DragImage

//

//  Created by Raja T S Sekhar on 3/9/11.

//  Copyright 2011 __MyCompanyName__. All rights reserved.

//

#import "DragImageViewController.h"

@implementation DragImageViewController

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

NSSet *allTouches = [event allTouches];

switch ([allTouches count]) {

case 1: {

UITouch *touch = [[allTouches allObjects] objectAtIndex:0];

CGPoint touchPoint = [touch locationInView:[self view]];

if (touchPoint.x > imageView.frame.origin.x  && 

touchPoint.x < imageView.frame.origin.x  + 

imageView.frame.size.width &&

touchPoint.y > imageView.frame.origin.y  && 

touchPoint.y < imageView.frame.origin.y  + 

imageView.frame.size.height

) {

[imageView setCenter:touchPoint];

}

}

break;

default:

break;

}

}

- (void)didReceiveMemoryWarning {

// Releases the view if it doesn't have a superview.

    [super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.

}

- (void)viewDidUnload {

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (void)dealloc {

    [super dealloc];

}

@end