swift 4.2用代码实现UISwitch(开关控件),UIS

ViewController.swift代码:

//  ViewController.swift

import UIKit

class ViewController: UIViewController {
    
    var leftSwitch: UISwitch!
    var rightSwitch: UISwitch!
    var sliderValue: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        let screen = UIScreen.main.bounds
        
        //1. 添加rightSwitch控件,rightSwitch与屏幕左边距,leftSwitch与屏幕右边距
        let switchScreenSpace: CGFloat = 39
        self.rightSwitch = UISwitch()
        var frame = self.rightSwitch.frame
        frame.origin = CGPoint(x: switchScreenSpace , y: 98) //设置frame中的origin,origin是控件的坐标原点.
        //重新设置控件的位置
        self.rightSwitch.frame = frame
        //设置控件状态
        self.rightSwitch.isOn = true
        //指定事件处理方法
        self.rightSwitch.addTarget(self, action: #selector(switchValueChanged(_:)), for: .valueChanged)
        self.view.addSubview(self.rightSwitch)
        
        //2. 添加leftSwitch控件
        self.leftSwitch = UISwitch()
        frame = self.leftSwitch.frame
        frame.origin = CGPoint(x: screen.size.width - (frame.size.width + switchScreenSpace), y: 98)
        //重新设置控件的位置
        self.leftSwitch.frame = frame
        //设置控件状态
        self.leftSwitch.isOn = true
        //指定事件处理方法
        self.leftSwitch.addTarget(self, action: #selector(switchValueChanged(_:)), for: .valueChanged)
        self.view.addSubview(self.leftSwitch)
        
        //3. 添加segmentedControl控件
        let segments = ["Right","Left"]
        let segmentdControl = UISegmentedControl(items: segments)
        let scWidth: CGFloat = 220
        let scHeight: CGFloat = 29 //默认高度
        let scTopView: CGFloat = 186
        frame = CGRect(x: (screen.size.width - scWidth)/2 , y: scTopView, width: scWidth, height: scHeight)
        //重新设置控件的位置
        segmentdControl.frame = frame
        //指定事件处理方法
        segmentdControl.addTarget(self, action: #selector(touchDown(_ :)), for: .valueChanged)
        self.view.addSubview(segmentdControl)
        
        
        //4. 添加slider控件
        let sliderWidth: CGFloat = 300
        let sliderHeight: CGFloat = 31 //默认高度
        let sliderdTopview: CGFloat = 298
        let slider = UISlider(frame: CGRect(x: (screen.size.width - sliderWidth)/2, y: sliderdTopview, width: sliderWidth, height: sliderHeight))
        slider.minimumValue = 0.0
        slider.maximumValue = 100.0
        slider.value = 50.00
        //指定事件处理方法
        slider.addTarget(self, action: #selector(sliderValueChange(_:)), for: .valueChanged)
        self.view.addSubview(slider)
        
        //5. 添加SliderValue标签,SliderValue:标签与Slider之间的距离
        let labelSliderValueSliderSpace: CGFloat = 30
        let labelSliderValue = UILabel(frame:CGRect(x: slider.frame.origin.x, y: slider.frame.origin.y - labelSliderValueSliderSpace, width: 103, height: 21))
        labelSliderValue.text = "SliderValue: "
        self.view.addSubview(labelSliderValue)
        
        //6. 添加sliderValue标签
        self.sliderValue = UILabel(frame: CGRect(x: labelSliderValue.frame.origin.x + 120, y: labelSliderValue.frame.origin.y, width: 50, height: 21))
        self.sliderValue.text = "50"
        self.view.addSubview(self.sliderValue)
        
        
    }
    
    @IBAction func switchValueChanged(_ sender: AnyObject) {
        let witchSwitch = sender as! UISwitch
        let setting = witchSwitch.isOn
        self.leftSwitch.setOn(setting, animated: true)
        self.rightSwitch.setOn(setting, animated: true)
    }
    
    //点击分段控件,控制开关控件的隐藏或显示
    @IBAction func touchDown(_ sender: AnyObject){
        let segmentedControl = sender as! UISegmentedControl
        print("选择的段: " , segmentedControl.selectedSegmentIndex)
        
        if(self.leftSwitch.isHidden == true) {
            self.rightSwitch.isHidden = false
            self.leftSwitch.isHidden = false
        } else {
            self.rightSwitch.isHidden = true
            self.leftSwitch.isHidden = true
        }
    }
    
    //用标签显示滑块的值
    @IBAction func sliderValueChange(_ sender: AnyObject) {
        let slider = sender as! UISlider
        let progressAsInt = Int(slider.value)
        let newText = String(format: "%d", progressAsInt)
        print("滑块的值: ", newText)
        self.sliderValue.text = newText
    }


}

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运行截图:

image.png