Successful Swipe in UITextView?

Question

Has anyone been able to implement a successful swipe gesture on a UITableView? By default this is not possible due to the scrolling nature of the control. I\'ve tried subcla

Answer 1

I took Ross's code and added a few things that helped me. In particular, this code won't respond to the swipe until it stops. It also prevents a swipe from reversing direction partway through.

#import 

#define kMinimumGestureLength   25
#define kMaximumVariance        5

typedef enum swipeDirection {
    kSwipeNone,
    kSwipeLeft,
    kSwipeRight
} tSwipeDirection;

@interface SwipeableTextView : UITextView {
    CGPoint gestureStartPoint;
    tSwipeDirection swipeDirection;
}

@end

@implementation SwipeableTextView

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];

    swipeDirection = kSwipeNone;
    UITouch *touch =[touches anyObject];
    gestureStartPoint = [touch locationInView:self];

}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesMoved:touches withEvent:event];

    UITouch *touch = [touches anyObject];
    CGPoint currentPosition = [touch locationInView:self];

    CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
    CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);

    // Check if we already started a swipe in a particular direction
    // Don't let the user reverse once they get going
    if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance &&
        swipeDirection == kSwipeNone) {
        if (gestureStartPoint.x < currentPosition.x) {
            swipeDirection = kSwipeRight;
        }
        else {
            swipeDirection = kSwipeLeft;
        }
    }
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if (swipeDirection == kSwipeRight) {
        NSLog(@"Swipe right");
    }
    else if (swipeDirection == kSwipeLeft) {
        NSLog(@"Swipe left");
    }
    [super touchesEnded:touches withEvent:event];
} 

@end