iOS/iPhone Rotation Gesture Recognizer (UIRotationGestureRecognizer)

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    // Rotation Gesture
    UIRotationGestureRecognizer *rotationGesture =[[UIRotationGestureRecognizer alloc]
                                                   initWithTarget: self
                                                   action: @selector(rotationGuestureHandle:)];
    [[self view] addGestureRecognizer:rotationGesture];
}

-(void) rotationGuestureHandle:(UIRotationGestureRecognizer *) sender {
    
    NSLog(@"Rotation Gesture Handling");
    
}

//
//  ViewController.h
//  rotationGesture
//
//  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
//  rotationGesture
//
//  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.
    
    // Rotation Gesture
    UIRotationGestureRecognizer *rotationGesture =[[UIRotationGestureRecognizer alloc]
                                                   initWithTarget: self
                                                   action: @selector(rotationGuestureHandle:)];
    [[self view] addGestureRecognizer:rotationGesture];
}

-(void) rotationGuestureHandle:(UIRotationGestureRecognizer *) sender {
    
    NSLog(@"Rotation Gesture Handling");
    
    UIRotationGestureRecognizer *rotation = (UIRotationGestureRecognizer *)sender;
    
    CGFloat angle = rotation.rotation;
    imgView.transform = CGAffineTransformRotate(imgView.transform, angle);
    rotation.rotation=0.0;
}

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

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