轻扫（swipe）手势

- (void)viewDidLoad{    [super viewDidLoad];    /*instantiate the object */    UISwipeGestureRecognizer *swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];    /*Swipes that are performed from right to left are to be detected*/    swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;    /*just one finger needed*/    swipeGestureRecognizer.numberOfTouchesRequired = 1;    /*add it to the view*/    [self.view addGestureRecognizer:swipeGestureRecognizer];}-(void)handleSwipes:(UISwipeGestureRecognizer *)paramSender{    NSLog(@"swipe to left");}