CODEWITHSUNDEEP
iphoneiosipaduigesturerecognizer
Xavier
Xavier

Reputation: 9049

Is there a way to detect multiple pan gestures?

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.

Upvotes: 3

Views: 2695

Answers (1)

Xavier
Xavier

Reputation: 9049

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);

Upvotes: 2

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