import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //选项除了文字还可以是图片
        let items = ["选项一", "选项二", UIImage(named: "g1")!] as [Any]
        let segmented = UISegmentedControl(items:items)
        segmented.center = self.view.center
        segmented.selectedSegmentIndex = 1 //默认选中第二项
        segmented.addTarget(self, action: #selector(ViewController.segmentDidchange(_:)),
                            for: .valueChanged)  //添加值改变监听
        self.view.addSubview(segmented)
    }
    
    func segmentDidchange(_ segmented:UISegmentedControl){
        //获得选项的索引
        print(segmented.selectedSegmentIndex)
        //获得选择的文字
        print(segmented.titleForSegment(at: segmented.selectedSegmentIndex))
    }
}

2，选择控件中选项的添加和删除

//添加文字选项
segmented.insertSegment(withTitle: "新增选项", at:1, animated:true);
//添加图片选项
segmented.insertSegment(with: UIImage(named:"icon")!, at:1, animated: true)
//移除选项
segmented.removeSegment(at: 1, animated:true)

3，修改选项颜色（包括图片选项）

segmented.tintColor = UIColor.red

4，修改选项文字

segmented.setTitle("swfit", forSegmentAt:1)

5，修改选项图片
（1）下面代码图片会自动变成蓝色

segmented.setImage(UIImage(named:"icon"), forSegmentAt:2)

（2）使用下面代码，图标保留原来的颜色

segmented.setImage(UIImage(named:"icon")?.withRenderingMode(.alwaysOriginal), forSegmentAt:2)

6，修改选项内容偏移位置

segmented.setContentOffset(CGSize(width:10, height:7), forSegmentAt:1)