如何更改选中和取消选中的carbonSegmentedControl项的alpha

import Carbon

class ViewController: UIViewController {
    @IBOutlet weak var segmentedControl: CarbonSegmentedControl!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置carbonSegmentedControl的选项
        segmentedControl.segments = ["Option 1", "Option 2", "Option 3"]
        
        // 添加选项改变事件的监听器
        segmentedControl.addTarget(self, action: #selector(segmentedControlValueChanged(_:)), for: .valueChanged)
    }
    
    @objc func segmentedControlValueChanged(_ segmentedControl: CarbonSegmentedControl) {
        // 获取选中和取消选中的项的索引
        let selectedSegmentIndex = segmentedControl.selectedIndex
        let deselectedSegmentIndex = segmentedControl.deselectedIndex
        
        // 获取选中和取消选中的项
        let selectedSegment = segmentedControl.segments[selectedSegmentIndex]
        let deselectedSegment = segmentedControl.segments[deselectedSegmentIndex]
        
        // 更改选中和取消选中项的alpha值
        selectedSegment.alpha = 1.0
        deselectedSegment.alpha = 0.5
    }
}