[xcode]スワイプ（スライド）の処理サンプル

xcode4.5.2

スワイプの処理サンプルです。

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
    NSDate *startTime;
    CGPoint startPt;
    int swipe_direction;
}

@property (nonatomic, retain) NSDate *startTime;

@end

ViewController.m

#import "ViewController.h"

#define HORIZ_SWIPE_MIN 12
#define VERT_SWIPE_MAX 8
#define SWIPE_NON 0
#define SWIPE_LEFT 1
#define SWIPE_RIGHT 2

@interface ViewController ()

@end

@implementation ViewController

@synthesize startTime;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view.
}

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

// タッチ開始
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    startPt = [[touches anyObject] locationInView:self.view];
    startTime = [[NSDate date] retain];
    swipe_direction = SWIPE_NON;
}

// タッチ移動
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint curPt = [[touches anyObject] locationInView:self.view];
    
    // 水平
    if (fabsf(startPt.x - curPt.x) >= HORIZ_SWIPE_MIN && fabsf(startPt.y - curPt.y) <= VERT_SWIPE_MAX) {
        if (startPt.x < curPt.x) {
            // 左にスワイプ
            swipe_direction = SWIPE_LEFT;
        } else {
            // 右にスワイプ
            swipe_direction = SWIPE_RIGHT;
        }
    }
}

// タッチ終了
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint curPt = [[touches anyObject] locationInView:self.view];
    if (swipe_direction != SWIPE_NON) {
        // スワイプの状態
        // 動いた時間
        NSTimeInterval dt = -[startTime timeIntervalSinceNow];
        // 移動距離
        int dx = fabsf(startPt.x - curPt.x);
        // 移動スピード
        double speed = dx / dt;
        
        NSLog(@"dir:%i, dx:%i, dt:%f, speed:%f",swipe_direction, dx, dt, speed);
    }
}
        
@end

右にスワイプは2、左にスワイプは1とでます。

Via:[iOS SDK]UIViewでスワイプを検出する方法
Via:[PDF]iOSイベント処理ガイド (TP40009541 1.5) – Apple Developer