iOS/iPhone Pinch Gesture Recognizer (UIPinchGestureRecognizer) Pinching in and out (for zooming a view)

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

-(void) pinGuestureHandle:(UIPinchGestureRecognizer *) sender {
    
    NSLog(@"Pin Gesture Handling");
    
}

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

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UILabel *lblString;
}

@end

//
//  ViewController.m
//  pinchGesture
//
//  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.
    
    UIPinchGestureRecognizer *pinchGuesture = [[UIPinchGestureRecognizer alloc]
                                               initWithTarget: self
                                               action: @selector(pinGuestureHandle:)];
    [[self view] addGestureRecognizer:pinchGuesture];
}

-(void) pinGuestureHandle:(UIPinchGestureRecognizer *) sender {
    
    NSLog(@"Pin Gesture Handling");
    
    UIFont *font = lblString.font;
    CGFloat pointSize = font.pointSize;
    NSString *name = font.fontName;
    pointSize = ((sender.velocity > 0) ? 1 : -1) * 1 + pointSize;
    
    if (pointSize < 14)
        pointSize = 14;
    if (pointSize > 38)
        pointSize = 38;
    lblString.font = [UIFont fontWithName:name size:pointSize];
    
}

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

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