ios - Implement button dragging with momentum? -

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i've managed implement draggable button in objective-c iphone app using code shown @ link: http://www.cocoanetics.com/2010/11/draggable-buttons-labels/

i wondering if library exists implement dragging momentum? if user moved button , let go, continue move little while, depending on drag coefficient.

i searched library, googled "ios button momentum" came empty...

if have support ios 6

you can animate change button's center when pan gesture ends:

if(pangesturerecognizer.state == uigesturerecognizerstatedended) {     finalvelocty.x = velocity.x;     finalyvelocity.y = velocity.y;     nstimeinterval animationtime = 0.25; //adjust time needs     [uiview animatewithduration:0.25 animations:^{       button.center = ... // calculate button's 'final' center (depending on velocity?)     } completion:nil];  }

for ios 7 or newer

apple's introduced uikit dynamics framework (consisting of uidynamicanimator , uidynamicitembehavior subclasses) in ios 7. it's physics engine integrated uikit. can use achieve "momentum" effect.

an example may find useful: http://www.teehanlax.com/blog/introduction-to-uimotioneffect/


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