Simultaneous gesture recognizers in Iphone SDK

Question

I need to catch two different swipping gestures using UISwipeGestureRecognizer(for example, UISwipeGestureRecognizerDirectionRight and UISwipeGestureRecognizerDirectionLeft). When I add two different recognisers with addGestureRecognizer method, only last added recognizer works. I've read that I need to implement gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: method of UIGestureRecognizerDelegate protocol, but nothing works.

Can anyone help with simple example of catching two or more same gestures? Thanks!

Answer 1

It was really easy:

At first we should create class, that implements UIGestureRecognizerDelegate protocol:

@interface MyGestureDelegate : NSObject <UIGestureRecognizerDelegate> 

  @implementation MyGestureDelegate  - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{     return YES; }  - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{     return YES; } - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{     return YES; }  

And use it like this:

      UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc]                                               initWithTarget:self action:@selector(handleSwipeGestureLeft:)];     [self.view addGestureRecognizer:swipeGestureLeft];     swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft;     [swipeGestureLeft release];      UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc]                                           initWithTarget:self action:@selector(handleSwipeGesture:)];     swipeGesture.direction = UISwipeGestureRecognizerDirectionRight;     [self.view addGestureRecognizer:swipeGesture];      MyGestureDelegate *deleg = [[MyGestureDelegate alloc] init];      [swipeGesture setDelegate:deleg];     [swipeGesture release];