iOS swift 开发中 Scroll Page Image 的演示代码
iOS swift 开发中 Scroll Page Image 的演示代码 多个图片可以左右滑动查看的代码
import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
let scrollView = UIScrollView(frame: CGRect(x:0, y:0, width:UIScreen.main.bounds.width,height: UIScreen.main.bounds.width))
var colors:[UIColor] = [UIColor.red, UIColor.blue, UIColor.green, UIColor.yellow]
var frame: CGRect = CGRect(x:0, y:0, width:0, height:0)
var pageControl : UIPageControl = UIPageControl(frame: CGRect(x:0,y: UIScreen.main.bounds.width, width:UIScreen.main.bounds.width, height:50))
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
super.viewDidLoad()
scrollView.delegate = self
scrollView.isPagingEnabled = true
scrollView.showsVerticalScrollIndicator = false
scrollView.showsHorizontalScrollIndicator = false
self.view.addSubview(scrollView)
for index in 0..<4 {
frame.origin.x = self.scrollView.frame.size.width * CGFloat(index)
frame.size = self.scrollView.frame.size
let subView = UIView(frame: frame)
subView.backgroundColor = colors[index]
self.scrollView .addSubview(subView)
}
self.scrollView.contentSize = CGSize(width:self.scrollView.frame.size.width * 4,height: self.scrollView.frame.size.height)
pageControl.addTarget(self, action: #selector(self.changePage(sender:)), for: UIControl.Event.valueChanged)
configurePageControl()
}
func configurePageControl() {
// The total number of pages that are available is based on how many available colors we have.
self.pageControl.numberOfPages = colors.count
self.pageControl.currentPage = 0
self.pageControl.tintColor = UIColor.red
self.pageControl.pageIndicatorTintColor = UIColor.black
self.pageControl.currentPageIndicatorTintColor = UIColor.green
self.view.addSubview(pageControl)
}
// MARK : TO CHANGE WHILE CLICKING ON PAGE CONTROL
@objc func changePage(sender: AnyObject) -> () {
let x = CGFloat(pageControl.currentPage) * scrollView.frame.size.width
scrollView.setContentOffset(CGPoint(x:x, y:0), animated: true)
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)
pageControl.currentPage = Int(pageNumber)
}
}
