实习笔记：uiscrollview与pagecontrol的综合应用

实习开发iOS地图租车界面时用到的界面UI元素。
趁有空在这里记录一下。
这是引入项目之前拿来做小测试的小小demo。

import UIKit

class ViewController: UIViewController,UIScrollViewDelegate {

@IBOutlet weak var myScrollView: UIScrollView!var codePageControl: UIPageControl!func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {    let currentPageNumber = Int(round(myScrollView.contentOffset.x / scrollView.frame.size.width))    codePageControl.currentPage = currentPageNumber}func codePageControlAction(sender: UIPageControl) {    let currentPageNumber = sender.currentPage     let width = myScrollView.frame.size.width    let offset = CGPoint(x: width * CGFloat(currentPageNumber), y: 0)    myScrollView.setContentOffset(offset, animated: true)}override func viewDidLayoutSubviews() {    myScrollView.contentSize.width = myScrollView.frame.width * 3    let viewColors = [UIColor.red,UIColor.green,UIColor.blue]    for i in 0..<3{        let oneView = UIView(            frame: CGRect(                x: CGFloat(i) * myScrollView.frame.size.width,                y: 0,                width: myScrollView.frame.size.width,                height: myScrollView.frame.size.height))        oneView.backgroundColor = viewColors[i]        myScrollView.addSubview(oneView)    }    myScrollView.isPagingEnabled = true    myScrollView.bounces = false    //建立PageControl    codePageControl = UIPageControl(frame: CGRect(x: view.frame.size.width/2 - 30, y: view.frame.size.height - 50, width: 60, height: 37))    codePageControl.pageIndicatorTintColor = UIColor.black    codePageControl.currentPageIndicatorTintColor = UIColor.lightGray    codePageControl.numberOfPages = 3    codePageControl.currentPage = 0    codePageControl.addTarget(self, action: #selector(ViewController.codePageControlAction(sender:)), for: .valueChanged)    view.addSubview(codePageControl)}

}