swift - UISegmentedControl 的用法

一、创建控件，并监听控件选择值

/*选项除了文字还可以是图片   as关键字的作用就是字面意思：类型转换*/
let items = ["选项一", "选项二", UIImage(named: "Icon_58")!] 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(mysegment:)),for: .valueChanged)  //添加值改变监听
self.view.addSubview(segmented)

方法的实现

func segmentDidchange(mysegment:UISegmentedControl){
        //获得选项的索引
        print(mysegment.selectedSegmentIndex)
        //获得选择的文字
        print(mysegment.titleForSegment(at: mysegment.selectedSegmentIndex))
    }

二、其他的属性

        //选择空间中选项的添加和删除
        segmented.insertSegment(withTitle: "新增选项", at: 2, animated: true)
        //添加图片选项
        segmented.insertSegment(with: UIImage(named:"Icon_58"), at: 2, animated: true)
        //移除选项
        segmented.removeSegment(at: 1, animated: true)

        //修改选项的颜色（包括图片选项）
        segmented.tintColor = UIColor.red

        //修改选项文字/图片
        segmented.setTitle("swift", forSegmentAtIndex: )
        segmented.setImage(UIImage(named: "hgl.jpeg"), forSegmentAtIndex: )

        //修改选项内容偏移位置
        segmented.setContentOffset(CGSize(width:5,height:10), forSegmentAtIndex: )