Is there a way to detect multiple pan gestures? - iphone

Question

I want the user to be able to pan from each thumb simultaneously but I can't figure out how to detect it with uigesturerecognizer. I can detect a tap and a pan simultaneously no problem.
It appears that the second pan will block the first.
Any help is appreciated.

Answer 1

I solved it by defining shouldReceiveTouch like so:
-(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if (gestureRecognizer == singleTap) {
return YES;
}
if (gestureRecognizer == pan1 && [touch locationInView:self].x > 160) {
return YES;
}
if (gestureRecognizer == pan2 && [touch locationInView:self].x <= 160) {
return YES;
}
return FALSE;
}
And initWithFrame has the following code:
self.userInteractionEnabled = YES;
singleTap = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(handleSingleTap:)];
singleTap.numberOfTapsRequired = 1;
[self addGestureRecognizer:singleTap];
[singleTap release];
NSLog(#"tap: %p", singleTap);
pan1 = [[UIPanGestureRecognizer alloc]
initWithTarget:self action:#selector(handlePan1:)];
[self addGestureRecognizer:pan1];
NSLog(#"pan1: %p", pan1);
pan2 = [[UIPanGestureRecognizer alloc]
initWithTarget:self action:#selector(handlePan2:)];
[self addGestureRecognizer:pan2];
for (UIGestureRecognizer *recognizer in self.gestureRecognizers) {
recognizer.delegate = self;
}
NSLog(#"pan2: %p", pan2);