我有一个“假”复选框，我使用UIButton和：

var mCheckState: Bool = false {
    didSet {
        if mCheckState == true {
            self.setImage(checkedImage, for: UIControl.State.normal)
        } else {
            self.setImage(uncheckedImage, for: UIControl.State.normal)
        }
    }
}

但当我创建此图层样式以添加阴影/高亮边缘时：

contentHorizontalAlignment = .left;
contentEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0);
setTitleColor(.black, for: UIControl.State.normal)
setTitleColor(UIColor(red: 0.85, green: 0.70, blue: 0.65, alpha: 1.0), for: UIControl.State.highlighted)

layer.backgroundColor = globalColorCG_white_background
layer.shadowColor = CGColor(gray: 1.0, alpha: 1.0)
layer.shadowOpacity = 0.8
layer.shadowRadius = globalButtonRadiusShadow * 0.75
layer.cornerRadius = globalButtonRadiusShadow
layer.shadowOffset = CGSize(width: -6.0,height: -8.0)

layer2 = CALayer(layer: layer)
layer2!.backgroundColor = globalColorCG_white_background
layer2!.shadowColor = CGColor(gray: 0.0, alpha: 1.0)
layer2!.shadowOpacity = 0.1
layer2!.shadowRadius = globalButtonRadiusShadow * 0.5
layer2!.cornerRadius = globalButtonRadiusShadow
layer2!.shadowOffset = CGSize(width: 6.0, height: 8.0)
layer2!.frame = layer.bounds
layer.insertSublayer(layer2!, at: 0)

showsTouchWhenHighlighted = true

...图像不再渲染。我应该添加/修复什么来让图像再次渲染？：-）
额外的信息代码：

let checkedImage = UIImage(systemName: "checkmark.square")! as UIImage
    let uncheckedImage = UIImage(systemName: "square")! as UIImage
    var mIsCheckBox = false
    var mCheckState: Bool = false {
        didSet {
            if mCheckState == true {
                self.setImage(checkedImage, for: UIControl.State.normal)
                //self.bringSubviewToFront(checkedImage)

            } else {
                self.setImage(uncheckedImage, for: UIControl.State.normal)
                //self.bringSubviewToFront(uncheckedImage)

            }
        }
    }