滑动到下一张图片时，PageControl 没有动画

Posted 2023-03-14

【中文标题】滑动到下一张图片时，PageControl 没有动画

【英文标题】：PageControl dosn't animate when swiping to next picture

【发布时间】：2018-12-15 22:01:43

【问题描述】：

我有一组图片，这些图片已传递到新 ViewController 上的 imageView。我可以让我的 pageControl 显示这些点，但是当我滑动到下一张图片时它们没有动画。关于我所缺少的任何想法，因为我无法弄清楚？谢谢！

import UIKit
import GoogleMobileAds


class imageViewController: UIViewController,GADBannerViewDelegate, UIGestureRecognizerDelegate, UIScrollViewDelegate 

    var bannerView: GADBannerView!

    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var myImageView: UIImageView!
    @IBOutlet weak var pageControl: UIPageControl!


    var passedImage : UIImage! = nil
    var passedArray : [UIImage]!
    var index = 0


    override func viewDidLoad()
        super.viewDidLoad()
        self.myImageView.image = passedArray.first

        scrollView.minimumZoomScale = 1.0
        scrollView.maximumZoomScale = 5.0

        configurePageControl()


        //---------ADS----------------
        // In this case, we instantiate the banner with desired ad size.
        bannerView = GADBannerView(adSize: kGADAdSizeBanner)
        addBannerViewToView(bannerView)
    

    func viewForZooming(in scrollView: UIScrollView) -> UIView? 
        return myImageView
    

    func configurePageControl() 
        self.pageControl.numberOfPages = passedArray.count
        self.pageControl.currentPage = 0
        self.pageControl.pageIndicatorTintColor = UIColor.black
    self.pageControl.currentPageIndicatorTintColor = UIColor.red
        self.view.addSubview(pageControl)

    



    @IBAction func pictureswipe(_ sender: Any) 
        let pictureString = self.passedArray[index]
        self.myImageView.image = pictureString

        index = (index < passedArray.count-1) ? index+1 : 0
    

    @IBAction func pictureswipeback(_ sender: Any) 
        let pictureString = self.passedArray[index]
        self.myImageView.image = pictureString

        index = (index > passedArray.count+1) ? index-1 : 0
    

【参考方案1】：

您还需要使用新索引更新您的pageControl 的currentPage，尝试更新您的IBAction 方法如下。

    @IBAction func pictureswipe(_ sender: Any) 
    let pictureString = self.passedArray[index]
    self.myImageView.image = pictureString
    self.pageControl.currentPage = index
    index = (index < passedArray.count-1) ? index+1 : 0



@IBAction func pictureswipeback(_ sender: Any) 
    let pictureString = self.passedArray[index]
    self.myImageView.image = pictureString
    self.pageControl.currentPage = index
    index = (index > passedArray.count+1) ? index-1 : 0