swift 3中饼图上的触摸事件

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建一个UIView，并添加到饼图上
        let pieChartView = UIView(frame: CGRect(x: 100, y: 100, width: 200, height: 200))
        pieChartView.backgroundColor = UIColor.lightGray
        view.addSubview(pieChartView)
        
        // 添加UITapGestureRecognizer手势识别器
        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
        pieChartView.addGestureRecognizer(tapGestureRecognizer)
    }
    
    @objc func handleTap(_ gestureRecognizer: UITapGestureRecognizer) {
        // 获取触摸点的坐标
        let touchPoint = gestureRecognizer.location(in: gestureRecognizer.view)
        
        // 根据触摸点的坐标，确定用户点击了饼图上的哪个部分
        // 在这里可以根据需要进行相应的处理
        
        // 示例：打印触摸点的坐标
        print("触摸点坐标：\(touchPoint)")
    }
}