objective c - How to control CAKeyframeAnimation with touch gesture? -

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i have caemitterlayer animated along bezier path (closed form, '8', out of 4 control points) cakeyframeanimation. want control animation slide of touch-finger along (but not on) path. how possible , possible?

make cgpoint click; variable remember initial "drag" point, create local nsevent handler...

[nsevent addlocalmonitorforeventsmatchingmask: nsmousemovedmask                                              | nsleftmousedownmask                                        handler:^(nsevent *e) {     if ( e.type == nsleftmousedown ) click = e.locationinwindow;     else "yourdelta" = click - e.locationinwindow;  // pseudocode      return e; }];

"yourdelta" offset of initial point current location... achieve similar results scroll events, monitoring nseventscrollwheelmask... , looking @ e.deltax , e.deltay values.

edit: i'm not familiar event handling on ios.. same technique applied normal event handlers... ie.

- (void)touchesbegan:(nsset *)touches withevent:(uievent*)e {     click = [e locationinview:_yourview];        } - (void)touchesmoved:(nsset *)touches withevent:(uievent*)e {     "yourdelta" = click - [e locationinview:_yourview];  // pseudocode  }

as "seeking" animation.. 1 possible way [layer addanimation:thenewanimation], using previous tovalue's, instead of basing fromvalue's of 0, or model layer... use layer.presentationlayer values instead? hard without seeing full content of cakeyframeanimation.


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