ios - How to prevent CABasicAnimation from scale all content inside UIView? -


i've wrote apply heart beat animation cashapelayer, after worked fine, need implement behind uibutton (btntest) without scaling uibutton or other content.

@iboutlet weak var btntest: uibutton!  let btnlayer = cashapelayer()  override func viewdidload() {     super.viewdidload() }  override func viewdidappear(_ animated: bool) {     super.viewdidappear(animated)     btntest.layer.removeallanimations()      let ovalpath = uibezierpath(arccenter: cgpoint(x: btntest.frame.midx, y: btntest.frame.midy), radius: 100, startangle: 0*(cgfloat.pi / 180), endangle: 360*(cgfloat.pi / 180), clockwise: true)      btnlayer.path = ovalpath.cgpath     btnlayer.fillcolor = uicolor.red.cgcolor     btnlayer.contentsgravity = "center"     btnlayer.opacity = 0.3     self.view.layer.addsublayer(btnlayer)      let theanimation = cabasicanimation(keypath: "transform.scale.xy")     theanimation.duration       = 0.75     theanimation.repeatcount    = float.infinity     theanimation.autoreverses   = true     theanimation.fromvalue      = 1.0     theanimation.tovalue        = 1.2     theanimation.timingfunction = camediatimingfunction(name: kcamediatimingfunctioneasein)     self.view.layer.add(theanimation, forkey: nil) }

the result gif

another solution changing line :

self.view.layer.add(theanimation, forkey: nil)

to :

btnlayer.add(theanimation, forkey: nil)

the result of this :gif

any ideas solve problem !

you want animate btnlayer. reason it's animating wrong place layer's anchorpoint @ 0,0, should set 0.5, 0.5.

edit:

actually, think issue put btnlayer. should make sublayer of button view's layer, , give frame that's bounds of button's layer:

btntest.layer.addsublayer(btnlayer) btnlayer.frame = btntest.layer.bounds

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