iOS/iPhone Pan Gesture Recognizer (UIPanGestureRecognizer) Panning or dragging

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
     
    // Pan Gesture
    UIPanGestureRecognizer *panGuesture = [[UIPanGestureRecognizer alloc]
                                           initWithTarget: self
                                           action: @selector(panGuestureHandle:)];
    [panGuesture setMinimumNumberOfTouches:1];
    [panGuesture setMaximumNumberOfTouches:1];
    [[self view] addGestureRecognizer:panGuesture];
}

-(void) panGuestureHandle:(UIPanGestureRecognizer *) sender {
    
    NSLog(@"Pan Gesture Handling");

}

//
//  ViewController.h
//  panGesture
//
//  Created by Weerachai on 11/17/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

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

@end

//
//  ViewController.m
//  panGesture
//
//  Created by Weerachai on 11/17/55 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.
     
    // Pan Gesture
    UIPanGestureRecognizer *panGuesture = [[UIPanGestureRecognizer alloc]
                                           initWithTarget: self
                                           action: @selector(panGuestureHandle:)];
    [panGuesture setMinimumNumberOfTouches:1];
    [panGuesture setMaximumNumberOfTouches:1];
    [[self view] addGestureRecognizer:panGuesture];
}

-(void) panGuestureHandle:(UIPanGestureRecognizer *) sender {
    
    NSLog(@"Pan Gesture Handling");
    
    UIPanGestureRecognizer *pangesture = (UIPanGestureRecognizer *)sender;
    CGPoint translation = [pangesture translationInView:self.view];
    
    CGPoint imageViewPosition = imgView.center;
    imageViewPosition.x += translation.x;
    imageViewPosition.y += translation.y;
    
    imgView.center = imageViewPosition;
    [pangesture setTranslation:CGPointZero inView:self.view];
}

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

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