You have to do touch analysis on your own.
It is not that difficult, but it is not done for you. Here a sample from some code I am actually using. It is not meant as a full-scale solution. It only detects basic tap/swipe/pinch gestures in a very concrete context (that of my app), and uses a rather uncool mechanism to deliver the gestures (notifications). So, it might apply to your case or more likely not, but I hope it gives you an idea of what is required.
NSSet* allTouches = [event allTouches];
UITouch* touch = [allTouches anyObject];
UIView* touchView = [touch view];
if (touch.phase == UITouchPhaseBegan) {
_initialView = touchView;
startTouchPosition1 = [touch locationInView:self];
startTouchTime = touch.timestamp;
if ([allTouches count] > 1) {
startTouchPosition2 = [[[allTouches allObjects] objectAtIndex:1] locationInView:self];
previousTouchPosition1 = startTouchPosition1;
previousTouchPosition2 = startTouchPosition2;
}
}
if (touch.phase == UITouchPhaseMoved) {
if ([allTouches count] > 1) {
CGPoint currentTouchPosition1 = [[[allTouches allObjects] objectAtIndex:0] locationInView:self];
CGPoint currentTouchPosition2 = [[[allTouches allObjects] objectAtIndex:1] locationInView:self];
CGFloat currentFingerDistance = CGPointDist(currentTouchPosition1, currentTouchPosition2);
CGFloat previousFingerDistance = CGPointDist(previousTouchPosition1, previousTouchPosition2);
if (fabs(currentFingerDistance - previousFingerDistance) > ZOOM_DRAG_MIN) {
NSNumber* movedDistance = [NSNumber numberWithFloat:currentFingerDistance - previousFingerDistance];
if (currentFingerDistance > previousFingerDistance) {
// NSLog(@"zoom in");
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ZOOM_IN object:movedDistance];
} else {
// NSLog(@"zoom out");
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ZOOM_OUT object:movedDistance];
}
}
}
}
if (touch.phase == UITouchPhaseEnded) {
CGPoint currentTouchPosition = [touch locationInView:self];
// Check if it's a swipe
if (fabsf(startTouchPosition1.x - currentTouchPosition.x) >= SWIPE_DRAG_HORIZ_MIN &&
fabsf(startTouchPosition1.x - currentTouchPosition.x) > fabsf(startTouchPosition1.y - currentTouchPosition.y) &&
touch.timestamp - startTouchTime < 0.7)
{
// It appears to be a swipe.
if (startTouchPosition1.x < currentTouchPosition.x) {
NSLog(@"swipe right");
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_SWIPE_RIGHT object:self];
} else {
NSLog(@"swipe left");
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_SWIPE_LEFT object:self];
}
} else {
//-- else, check if it's a single touch
if (touch.tapCount == 1) {
NSDictionary* uInfo = [NSDictionary dictionaryWithObject:touch forKey:@"touch"];
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_TAP object:self userInfo:uInfo];
}/* else if (touch.tapCount > 1) {
handle multi-touch
}
*/
}
startTouchPosition1 = CGPointMake(-1, -1);
_initialView = nil;
}
if (touch.phase == UITouchPhaseCancelled) {
_initialView = nil;
// NSLog(@"TOUCH CANCEL");
}