iphone - iOS: Can I override pinch in/out behavior of UIScrollView? -


i'm drawing graph on uiview, contained uiscrollview user can scroll horizontally around entire graph.

now want zoom graph when user pinches in 2 fingers, instead of zooming in view same rate x , y direction, want zoom in x direction changing x scale, without changing y scale.

i think have catch pinch in/out gesture , redraw graph, overriding default zooming behavior.

but there way this?

i've been having difficult time catch pinch gesture on uiscrollview, cancels touches when starts scroll. want zooming work after uiscrollview cancels touches. :(

thanks, kura

although cannot delete existing pinch gesture recognizer, can disable , add own:

// disable existing recognizer (uigesturerecognizer* recognizer in [_scrollview gesturerecognizers]) {     if ([recognizer iskindofclass:[uipinchgesturerecognizer class]]) {         [recognizer setenabled:no];     } }  // add our own uipinchgesturerecognizer* pinchrecognizer =    [[uipinchgesturerecognizer alloc] initwithtarget:self                                              action:@selector(pinch:)]; [_scrollview addgesturerecognizer:pinchrecognizer]; [pinchrecognizer release];

then in

- (void) pinch:(uipinchgesturerecognizer*)recognizer { .. }

use 

[recognizer locationoftouch:0 inview:..] [recognizer locationoftouch:1 inview:..]

to figure out if user pinching horizontally or vertically.


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