ios - "zPosition" CABasicAnimation not working -


i used animation along z axis long time ago in objective c : 

    cabasicanimation *positionanimation;      positionanimation=[cabasicanimation animationwithkeypath:@"zposition"];     positionanimation.fromvalue=[nsnumber numberwithfloat:frandom(800, 400)];     positionanimation.tovalue=[nsnumber numberwithfloat:frandom(-300, -100)];     positionanimation.duration=duration;     positionanimation.repeatcount = huge_valf;     positionanimation.removedoncompletion = no;

but not working anymore on swift 3, layer not move @ all.

        let positionanimation = cabasicanimation(keypath: "zposition")         positionanimation.fromvalue = nsnumber(value: float.random(from: 800, 400))         positionanimation.tovalue = nsnumber(value: float.random(from: -300, -100))         positionanimation.duration = duration         positionanimation.repeatcount = 400         positionanimation.isremovedoncompletion = false

did miss ? thank you.


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