关于swift：CAShapeLayer圈未在iPhone 6上显示，但在iPhone 5上使用相同的代码运行

CAShapeLayer circle not showing on iPhone 6, but its working on iPhone 5 with the same code

我在自定义uiview类中使用cashapelayer以编程方式制作了一个简单的圆圈，如下所示：

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class UserProfileCircleAnimated: UIView {

private lazy var leftPhotoArc: CAShapeLayer = {
let leftPhotoArc = CAShapeLayer()
leftPhotoArc.lineWidth = 6
leftPhotoArc.strokeColor = UIColor.rgb(red: 232, green: 72, blue: 85, alpha: 1).cgColor
leftPhotoArc.fillColor = nil
leftPhotoArc.path = UIBezierPath(arcCenter: CGPoint(x: 25, y: 25), radius: 25 , startAngle: 2 * CGFloat(M_PI), endAngle: 0, clockwise: true).cgPath
return leftPhotoArc
}()

override init(frame: CGRect) {
super.init(frame: frame)

translatesAutoresizingMaskIntoConstraints = false
backgroundColor = UIColor.yellow
setupViews()
}

private func setupViews(){
layer.addSublayer(leftPhotoArc)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

并在自定义集合视图单元格中对其进行了初始化：

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class AllCell: UICollectionViewCell {
let userProfileCircleAnimated = UserProfileCircleAnimated()
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(userProfileCircleAnimated)
userProfileCircleAnimated.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
userProfileCircleAnimated.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
userProfileCircleAnimated.widthAnchor.constraint(equalToConstant: 50).isActive = true
userProfileCircleAnimated.heightAnchor.constraint(equalToConstant: 50).isActive = true

}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

，结果是它出现在ip5模拟器上，而不是出现在ip6上，为什么？谢谢！
iphone 5
iphone 6