UI Gesture in iPhone

Sachin Bhardwaj
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Article

Introduction

In this article I will create a Single view application. Here I use a single label from outlet. When we perform a gesture it shows the relevant message on the Simulator screen.

To understand it we use the following.

Step 1

Open XCode by double-clicking on it.

Step 2

Create a New XCode Project by clicking on it.

Step 3

Now Select Single View Application and click on Next.

Step 4

Now provide your Product Name and Company Identifier.

Step 5

Select the location where you want to save your project and click on Create.

Step 6

Now here we write code:

RecognizerViewController.h

//
// RecognizerViewController.h
// UIGesture
//
// Created by Sachin Bhardwaj on 11/12/12.
// Copyright (c) 2012 Sachin Bhardwaj. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface RecognizerViewController : UIViewController

@property (strong, nonatomic) IBOutlet UILabel *statusLabel;

@end

RecognizerViewController.m

//
// RecognizerViewController.m
// UIGesture
//
// Created by Sachin Bhardwaj on 11/12/12.
// Copyright (c) 2012 Sachin Bhardwaj. All rights reserved.
//

#import "RecognizerViewController.h"

@interface RecognizerViewController ()

@end

@implementation RecognizerViewController
@synthesize statusLabel;
- (void)viewDidLoad
{
    [super viewDidLoad];
      UITapGestureRecognizer *doubleTap =
    [[UITapGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(tapDetected:)];
    doubleTap.numberOfTapsRequired = 2;
    [self.view addGestureRecognizer:doubleTap];

    UITapGestureRecognizer *SingleTap =
    [[UITapGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(tapDetectedS:)];
    SingleTap.numberOfTapsRequired = 1;
  [self.view addGestureRecognizer:SingleTap];


    UIPinchGestureRecognizer *pinchRecognizer =
    [[UIPinchGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(pinchDetected:)];
    [self.view addGestureRecognizer:pinchRecognizer];

    UIRotationGestureRecognizer *rotationRecognizer =
    [[UIRotationGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(rotationDetected:)];
    [self.view addGestureRecognizer:rotationRecognizer];

    UISwipeGestureRecognizer *swipeRecognizerR =
    [[UISwipeGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(swipeDetected:)];
    swipeRecognizerR.direction = UISwipeGestureRecognizerDirectionRight;
    [self.view addGestureRecognizer:swipeRecognizerR];

    UISwipeGestureRecognizer *swipeRecognizerUp =
    [[UISwipeGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(swipeDetectedUp:)];
    swipeRecognizerUp.direction = UISwipeGestureRecognizerDirectionUp;
    [self.view addGestureRecognizer:swipeRecognizerUp];

    UISwipeGestureRecognizer *swipeRecognizerDown =
    [[UISwipeGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(swipeDetectedDown:)];
    swipeRecognizerDown.direction = UISwipeGestureRecognizerDirectionDown;
    [self.view addGestureRecognizer:swipeRecognizerDown];

    UISwipeGestureRecognizer *swipeRecognizerL =
    [[UISwipeGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(swipeDetectedL:)];
    swipeRecognizerL.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipeRecognizerL];


    UILongPressGestureRecognizer *longPressRecognizer =
    [[UILongPressGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(longPressDetected:)];
    longPressRecognizer.minimumPressDuration = 2;
    longPressRecognizer.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:longPressRecognizer];
}

- (IBAction)longPressDetected:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Long Press";
}

- (IBAction)swipeDetectedUp:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Up Swipe";
}

- (IBAction)swipeDetectedDown:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Down Swipe";
}

- (IBAction)swipeDetected:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Right Swipe";
}

- (IBAction)swipeDetectedL:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Left Swipe";
}

- (IBAction)tapDetectedS:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Single Tap";
}
- (IBAction)tapDetected:(UIGestureRecognizer *)sender {
    statusLabel.text = @"Double Tap";
}

- (IBAction)pinchDetected:(UIGestureRecognizer *)sender {

    CGFloat scale =
    [(UIPinchGestureRecognizer *)sender scale];
    CGFloat velocity =
    [(UIPinchGestureRecognizer *)sender velocity];

    NSString *resultString = [[NSString alloc] initWithFormat:
                              @"Pinch - scale = %f, velocity = %f",
                              scale, velocity];
    statusLabel.text = resultString;
}

- (IBAction)rotationDetected:(UIGestureRecognizer *)sender {
    CGFloat radians =
    [(UIRotationGestureRecognizer *)sender rotation];
    CGFloat velocity =
    [(UIRotationGestureRecognizer *)sender velocity];

    NSString *resultString = [[NSString alloc] initWithFormat:
                              @"Rotation - Radians = %f, velocity = %f",
                              radians, velocity];
    statusLabel.text = resultString;
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end