ios - Add subviews on Customize UIView works not as expect -

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i subclass class of uiview called:aurtabview. drag 3 views(white background) storyboard auto layout them 1/3 screen width of each. add uibutton on init method, works far below:enter image description here

then want add 2 uiviews on them. weird thing first , third autrabview works expect, middle 1 doesn't.

enter image description here

this weird. checked uiview hierarchy below:enter image description here

any point?

here code:

class aurtabview: uiview {      let tabbutton   = uibutton()     let smallcircle = uiview()     let largecircle = uiview()      required init?(coder adecoder: nscoder) {         super.init(coder: adecoder)          self.addsubview(tabbutton)         self.addsubview(smallcircle)         self.addsubview(largecircle)     }      override func layoutsubviews() {         super.layoutsubviews()          let height = self.frame.height         tabbutton.frame = cgrect(x: (self.frame.width-height)/2, y: 0, width: height, height: height)         tabbutton.backgroundcolor = uicolor.greencolor()          smallcircle.frame = cgrect(x: cgrectgetmidx(self.frame)-2.5, y: height-10-8, width: 5, height: 5)         smallcircle.backgroundcolor = uicolor.redcolor()         largecircle.frame = cgrect(x: cgrectgetmidx(self.frame)-5, y: height-8, width: 10, height: 10)         largecircle.backgroundcolor = uicolor.redcolor()         print(smallcircle)         print(largecircle)     }      override func drawrect(rect: cgrect) {         tabbutton.layer.cornerradius = tabbutton.frame.width/2     } }

use this

import uikit

class aurtabview: uiview {

let tabbutton   = uibutton() let smallcircle = uiview() let largecircle = uiview()  required init?(coder adecoder: nscoder) {     super.init(coder: adecoder)      self.addsubview(tabbutton)     self.addsubview(smallcircle)     self.addsubview(largecircle) }  override func layoutsubviews() {     super.layoutsubviews()      let height = self.frame.height     tabbutton.frame = cgrect(x: (self.frame.width-height)/2, y: 0, width: height, height: height)     tabbutton.backgroundcolor = uicolor.greencolor()      smallcircle.frame = cgrect(x: self.frame.width/2 - 2.5, y: height-10-8, width: 5, height: 5)     smallcircle.backgroundcolor = uicolor.blackcolor()     largecircle.frame = cgrect(x:  self.frame.width/2 - 5, y: height-8, width: 10, height: 10)     largecircle.backgroundcolor = uicolor.redcolor()     print(smallcircle)     print(largecircle) }  override func drawrect(rect: cgrect) {     tabbutton.layer.cornerradius = tabbutton.frame.width/2 }

}


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