Swift - UISegmentedControl

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let items = ["optionA","optionB","optionC"]
        let segmented = UISegmentedControl(items: items)
        //设置中心位置
        segmented.center = self.view.center
        //设置默认选中的索引,索引从0开始
        segmented.selectedSegmentIndex = 1
        //添加监听事件
        segmented.addTarget(self,action: #selector(ViewController.SegmentedChanged(_:)),for: .valueChanged)
        //添加文字选项
        segmented.insertSegment(withTitle: "option D",at: 4,animated: true)
        //添加图片选项(withRenderingMode(.alwaysOriginal)设置图片颜色为原颜色，而不是系统默认的蓝色)
        segmented.insertSegment(with: UIImage(named:"Icon")?.withRenderingMode(.alwaysOriginal),at: 1,animated: true)
        //移除指定选项
        segmented.removeSegment(at: 1,animated: true)
        //移除全部选项
//        segmented.removeAllSegments()
        //修改选项颜色
        segmented.tintColor = UIColor.blue
        //修改选项文字
        segmented.setTitle("newName",forSegmentAt: 3)
        //修改选项图片
        segmented.setimage(UIImage(named: "newIcon"),forSegmentAt: 1)
        //修改选项内容偏移位置
        segmented.setContentOffset(CGSize(width: 5,height: 5),forSegmentAt: 1)
        //添加到视图中
        self.view.addSubview(segmented)
    }
    @objc func SegmentedChanged(_ segmented:UISegmentedControl)
    {
        //打印选项的索引
       print("index is \(segmented.selectedSegmentIndex)")
        //打印选择的文字
        print("option is \(String(describing: segmented.titleForSegment(at: segmented.selectedSegmentIndex)))")//将获得值转为String类型
    }

}