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eReader swipe and hidden bottom nav in UIWebView

/ Published in: iPhone
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wv is my UIWebView object

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  1. #define HORIZ_SWIPE_DRAG_MIN 100
  2. CGPoint mystartTouchPosition;
  3. BOOL isProcessingListMove;
  4.  
  5. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
  6. {
  7. 	UITouch *touch = [touches anyObject];
  8. 	CGPoint newTouchPosition = [touch locationInView:self.view];
  9. 	if(mystartTouchPosition.x != newTouchPosition.x || mystartTouchPosition.y != newTouchPosition.y) {
  10. 		isProcessingListMove = NO;
  11. 	}
  12. 	mystartTouchPosition = [touch locationInView:self.view];
  13. 	[super touchesBegan:touches withEvent:event];
  14. 	[[self.wv.subviews objectAtIndex:0] touchesBegan:touches withEvent:event];
  15. }
  16.  
  17. -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
  18. {
  19. 	UITouch *touch = touches.anyObject;
  20. 	CGPoint currentTouchPosition = [touch locationInView:self.view];
  21.  
  22. 	// If the swipe tracks correctly.
  23. 	double diffx = mystartTouchPosition.x - currentTouchPosition.x + 0.1; // adding 0.1 to avoid division by zero
  24. 	double diffy = mystartTouchPosition.y - currentTouchPosition.y + 0.1; // adding 0.1 to avoid division by zero
  25.  
  26. 	if(abs(diffx / diffy) > 1 && abs(diffx) > HORIZ_SWIPE_DRAG_MIN)
  27. 	{
  28. 		// It appears to be a swipe.
  29. 		if(isProcessingListMove) {
  30. 			// ignore move, we're currently processing the swipe
  31. 			return;
  32. 		}
  33.  
  34. 		if (mystartTouchPosition.x < currentTouchPosition.x) {
  35. 			isProcessingListMove = YES;
  36. 			[self moveToPreviousItem];
  37. 			return;
  38. 		}
  39. 		else {
  40. 			isProcessingListMove = YES;
  41. 			[self moveToNextItem];
  42. 			return;
  43. 		}
  44. 	}
  45. 	else if(abs(diffy / diffx) > 1)
  46. 	{
  47. 		isProcessingListMove = YES;
  48. 		[[self.wv.subviews objectAtIndex:0] touchesMoved:touches	withEvent:event];	
  49. 		[super touchesMoved:touches	withEvent:event];
  50. 	}
  51.  
  52. }
  53.  
  54. -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
  55. {
  56. 	isProcessingListMove = NO;
  57. 	[super touchesEnded:touches withEvent:event];
  58. 	[[self.wv.subviews objectAtIndex:0] touchesEnded:touches withEvent:event];
  59. }

URL: http://www.iphonedevsdk.com/forum/iphone-sdk-development/2168-how-did-they-do-ereader-swipe-hidden-bottom-nav-uiwebview.html

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