ios - 我应该如何使用 UIScrollView 中的 UIpageControl

Question

我应该如何使用 UIScrollView 中的 UIpageControl？我被卡住了，帮帮我。

这是我的代码，请帮忙;

class home: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var mainScrollView: UIScrollView!
    @IBOutlet weak var pagecontrol: UIPageControl!

    var imageArray = [UIImage]()
    var pageControl : UIPageControl!

    override func viewDidLoad() {
        super.viewDidLoad()


        mainScrollView.delegate = self

    imageArray = [#imageLiteral(resourceName: "sliderImage"), #imageLiteral(resourceName: "clothing"), #imageLiteral(resourceName: "sports")]

        for i in 0..<imageArray.count{

            let imageView = UIImageView()
            imageView.image = imageArray[i]
            imageView .contentMode = .scaleToFill
            let xPosition = self.view.frame.width * CGFloat(i)
            imageView.frame = CGRect(x: xPosition, y: 0, width: self.mainScrollView.frame.width, height: self.mainScrollView.frame.height)

            mainScrollView.contentSize.width = mainScrollView.frame.width * CGFloat(i + 1)
            mainScrollView.addSubview(imageView)
        }


        // Do any additional setup after loading the view.
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

Answer 1

看看这个 answer

这些年来情况几乎没有变化:

1. 将您的 UIScrollView 委托(delegate)设置为您的 View Controller (您所做的)；
2. 为 scrollViewDidScroll 委托(delegate)方法添加代码:

func scrollViewDidScroll(_ scrollView: UIScrollView) 
{
    self.pageControl.currentPage = Int(floorf(Float(scrollView.contentOffset.x / scrollView.width)))
}  

1. 在 scrollViewDidEndDecelerating 方法中添加相同的内容:

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView)
{
    self.pageControl.currentPage = Int(floorf(Float(scrollView.contentOffset.x / scrollView.width)))
}

不过，这取决于您的需求 - 尝试使用和不使用它们中的每一个如何工作。