ios – 如果用户在Swift中选择了UISegmentedControl,该怎么改？

我用以下代码创建了它：

let selectedAttributes: NSDictionary = [
        NSForegroundColorAttributeName: UIColor.black,NSFontAttributeName: fontForSegmentedControl!
    ]

    let normalAttributes: NSDictionary = [
        NSForegroundColorAttributeName: UIColor.gray,NSFontAttributeName: fontForSegmentedControl!
    ]

    mySegmentedControl.setTitleTextAttributes(selectedAttributes as [NSObject : AnyObject],for: UIControlState.selected)

    mySegmentedControl.setTitleTextAttributes(normalAttributes as [NSObject : AnyObject],for: UIControlState.normal)

并且移除边界的扩展位置在这里：

extension UISegmentedControl {
    func removeBorders() {
        setBackgroundImage(imageWithColor(color: UIColor.white/*backgroundColor!*/),for: .normal,barMetrics: .default)
        setBackgroundImage(imageWithColor(color: tintColor!),for: .selected,barMetrics: .default)
        setDividerImage(imageWithColor(color: UIColor.clear),forLeftSegmentState: .normal,rightSegmentState: .normal,barMetrics: .default)
    }

    // create a 1x1 image with this color
    private func imageWithColor(color: UIColor) -> UIImage {
        let rect = CGRect(x: 0.0,y: 0.0,width:  1.0,height: 1.0)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        context!.setFillColor(color.cgColor);
        context!.fill(rect);
        let image = UIGraphicsGetimageFromCurrentimageContext();
        UIGraphicsEndImageContext();
        return image!
    }
}

但是有一件事是错误的.

当我点击(并按住)ONE或TWO时,将背景颜色更改为(用户手指触摸的时间)：

我在UISegmentedControl中缺少一些用于选择(临时按下)选项的样式的代码.

如何清除深灰色的选择并留下清晰的颜色？