ios - UIView animation causing label to twitch -

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i have iconview class use custom image google maps marker. of print statements show code correctly executing. however, "12:08" uilabel in circleview keeps on growing , shrinking (i.e. twitching). can't figure out problem might be. i've tried manually setting the font in completion block, commenting out adjustsfontsizetofitwidth, changing circleview uibutton. 

import uikit  class iconview: uiview {     var timelabel: uilabel!     var circleview: uiview!     var clicked: bool!      //constants     let circleviewwidth = 50.0     let circleviewheight = 50.0      override init(frame:cgrect) {         super.init(frame : frame)         self.backgroundcolor = uicolor(red: 47/255, green: 49/255, blue: 53/255, alpha: 0.0)         clicked = false          if !clicked {         //main circle             print("init circle view")         circleview = uiview(frame: cgrect(x:0, y:0, width:circleviewwidth, height:circleviewheight))         circleview.backgroundcolor = uicolor(red: 47/255, green: 49/255, blue: 53/255, alpha: 1.0)         circleview.layer.cornerradius = circleview.frame.size.height / 2.0         circleview.layer.maskstobounds = true         self.addsubview(circleview)          timelabel = uilabel(frame: cgrect(x: 0, y: 0, width: circleviewwidth, height: circleviewheight/3.0))         timelabel.center = circleview.center         timelabel.text = "12:08"         timelabel.textalignment = .center         timelabel.textcolor = .white         timelabel.numberoflines = 0         timelabel.font = uifont.systemfont(ofsize: 11)         timelabel.font = uifont.boldsystemfont(ofsize: 11)         timelabel.adjustsfontsizetofitwidth = true         circleview.addsubview(timelabel)         }     }      required init?(coder adecoder: nscoder) {         super.init(coder: adecoder)     } } 
func mapview(_ mapview: gmsmapview, didtap marker: gmsmarker) -> bool {         let iconview = marker.iconview as! iconview         print("going start animating")         if !iconview.clicked {             uiview.animate(withduration: 0.2, animations: {                 print("making bigger now")                 iconview.circleview.transform = cgaffinetransform(scalex: 1.2, y: 1.2)             })             { (finished:bool) -> void in                 print("done")                 iconview.clicked = true             }         }         return true     }


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