Gesture Recognition

gistfile1.m

/********************************************************************
* Add Recognizer to view
*
* UITapGestureRecognizer
* UISwipeGestureRecognizer
* UIPinchGestureRecognizer
* UIRotationGestureRecognizer
* UIPanGestureRecognizer
* UILongPressGestureRecognizer
*/
// For tap gesture
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
[tapRecognizer setNumberOfTapsRequired:1];
// [tapRecognizer requireGestureRecognizerToFail:doubleTap]; // For resolve gesture confliction
// [tapRecognizer setNumberOfTouchesRequired:2];
// [tapRecognizer setDelegate:self]; // for web view
[holderView addGestureRecognizer:tapRecognizer];
[tapRecognizer release];



// For swipe gesture
UISwipeGestureRecognizer* swipeLeftOnMainView = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeOnMainView:)];
swipeLeftOnMainView.direction = UISwipeGestureRecognizerDirectionLeft;
[self.mainView addGestureRecognizer:swipeLeftOnMainView];
[swipeLeftOnMainView release];

// For two finger pinch
UIPinchGestureRecognizer *twoFingerPinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)];
[[self view] addGestureRecognizer:twoFingerPinch];
[twoFingerPinch release];

// For two finger rotate  
UIRotationGestureRecognizer *twoFingersRotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)];
[[self view] addGestureRecognizer:twoFingersRotate];
[twoFingersRotate release];



/********************************************************************
* Gesture Recognizer Action Methods
* - (void)handleGesture
* - (void)handleGesture:(UIGestureRecognizer *)sender
*/

- (void)oneFingerTwoTaps
{
  NSLog(@"Action: One finger, two taps");
}

- (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer 
{ 
  CGPoint point = [recognizer locationInView:[self view]];
  NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);
}
 
- (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer 
{
  // Convert the radian value to show the degree of rotation
  NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
}
 
- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer 
{
  NSLog(@"Pinch scale: %f", recognizer.scale);
}

/********************************************************************
* - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
* - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
* - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
*   shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
* 
* For add gesture recognizer to UIWebView, we need to set delegate 
* for it so that it'll recognize gestures simultaneously
*/
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

        return YES;
}