ios - CAKeyFrameAnimation: Where/How to set the final position/scale? -

ios - CAKeyFrameAnimation: Where/How to set the final position/scale? -

i trying create button shrink/expand upon touch using code below.

- (void)touchesbegan:(nsset *)touches withevent:(uievent *)event { uitouch *mytouch = [touches anyobject]; uiview *view = [mytouch view]; view.transform = cgaffinetransformmakescale(0.7, 0.7);<--is correct?? cakeyframeanimation *scale = [cakeyframeanimation animationwithkeypath:@"transform.scale"]; scale.duration = 0.8; scale.values = @[@1.0, @0.7, @0.9, @0.7, @0.8, @0.7]; scale.keytimes = @[@0.13, @0.26, @0.39, @0.52, @0.65, @0.8]; scale.repeatcount = 1; scale.timingfunction = [camediatimingfunction functionwithname:kcamediatimingfunctionlinear]; [view.layer addanimation:scale forkey:@"scaleanimation"]; }

finally want maintain button in shrunk state after touch ended.

1. should seek permanently alter layers scale? touchesbegan? touchesended? 2. how should that? (see "<=== correct?" line)

i wouldn't utilize of code have written.

it looks you're trying "bounce" scale of button looks user has affected physically.

to can utilize modern block based animation , new (to ios7) version uses spring damping create animation curve.

this give effect of bouncing (but need numbers right).

[uiview animatewithduration:0.8 delay:0.0 usingspringwithdamping:0.0 // mess around initialspringvelocity:0.0 // , options:0 animations:^{ view.transform = cgaffinetransformmakescale(0.7, 0.7); } completion:^(bool finished){ // if want reset button here }];

you can read more function here...

apple docs uiview.

my blog function , parameters mean.

ios iphone core-animation cakeyframeanimation