ios - CABasicAnimation + UIBezierPath -

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i'm trying create circular bar such 1 can find around recording button in native camera on ios when doing timelapse.

a circle created along animation, , once completed removed again "naturally".

i tried next code:

cashapelayer *circle = [cashapelayer layer]; circle.path = [uibezierpath bezierpathwitharccenter:cgpointmake(self.lapsebtnoutlet.center.x, self.lapsebtnoutlet.center.y) radius:28 startangle:2*m_pi*0-m_pi_2 endangle:2*m_pi*1-m_pi_2 clockwise:yes].cgpath; circle.fillcolor = [uicolor clearcolor].cgcolor; circle.strokecolor = [uicolor whitecolor].cgcolor; circle.linewidth = 2.0;  cabasicanimation *animation = [cabasicanimation animationwithkeypath:@"strokeend"]; animation.duration = self.lapseinterval; animation.removedoncompletion = no; animation.fromvalue = @(0); animation.tovalue = @(1); animation.timingfunction = [camediatimingfunction functionwithname:kcamediatimingfunctionlinear]; [circle addanimation:animation forkey:@"drawcircleanimation"];

but problem don't know how "remove" line start-to-end.

i tried autoreverse property, removes circle end-to-start instead start-to-end. ideas?

you need animate strokestart 0 1, , when animation finishes, remove shape layer. 

- (void)viewdidload {     [super viewdidload];     [self performselector:@selector(animateproperty:) withobject:@"strokeend" afterdelay:1];     [self performselector:@selector(animateproperty:) withobject:@"strokestart" afterdelay:3]; }   -(void)animateproperty:(nsstring *) prop {     if (! self.circle) {         self.circle = [cashapelayer layer];         self.circle.path = [uibezierpath bezierpathwitharccenter:cgpointmake(self.lapsebtnoutlet.center.x, self.lapsebtnoutlet.center.y) radius:28 startangle:2*m_pi*0-m_pi_2 endangle:2*m_pi*1-m_pi_2 clockwise:yes].cgpath;         self.circle.fillcolor = [uicolor clearcolor].cgcolor;         self.circle.strokecolor = [uicolor whitecolor].cgcolor;         self.circle.linewidth = 2.0;         [self.view.layer addsublayer:self.circle];     }      cabasicanimation *animation = [cabasicanimation animationwithkeypath:prop];     animation.delegate = ([prop isequaltostring:@"strokestart"])? self : nil;     animation.duration = 1;     animation.removedoncompletion = no;     animation.fromvalue = @0;     animation.tovalue = @1;     [self.circle addanimation:animation forkey:prop]; }   -(void)animationdidstop:(caanimation *)anim finished:(bool)flag {     [self.circle removefromsuperlayer];     self.circle = nil; }

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