Question

Working in Xcode/iPhone simulator, I have an app where UIGestureRecognizers were working for pinch, tap, and pan. Without changing any code, pinches are no longer being recognized (I am holding down the option key while moving the mouse to show the two grey circles moving together or apart). Pan and tap still both work. Has anyone else experienced this problem?

It appears that something is wrong with the recognizer itself or the simulator because the code below for pinching never gets called, but it works for for panning.

- (void)pinch:(UIPinchGestureRecognizer *)gesture
{
NSLog(@"in pinch method");
if ((gesture.state == UIGestureRecognizerStateChanged) ||
    (gesture.state == UIGestureRecognizerStateEnded)) {
    self.scale *= gesture.scale; // adjust our scale
    gesture.scale = 1;           // reset gestures scale so future changes are incremental
}
}

- (void)tap:(UITapGestureRecognizer *)gesture
{
NSLog(@"in tap method");
if (gesture.state == UIGestureRecognizerStateEnded) 
    self.originInPixels = [gesture locationInView:self];
}

I tried creating a new app with a simple MKMapView, which loads the map properly, and pan and tap work – but pinch still doesn’t work.

I’m working in iOS 5.1.

Any ideas?

Answer 1

The UIGestureRecognizer began working again on its own, and I’m still not sure why. It may have been as simple as I wasn’t holding down the mouse button while also holding down the option key, but I thought I tried that before.

Thanks for the suggestions above.