swift UIScrollView

最新推荐文章于 2024-07-27 15:37:33 发布

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最新推荐文章于 2024-07-27 15:37:33 发布

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分类专栏： swift 文章标签： ios swift UIScrollView

本文链接：https://blog.youkuaiyun.com/NoPolun_iOS/article/details/54024410

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本文介绍如何使用SwiftUI中的UIScrollView实现图片的放大缩小及页面间的平滑滚动效果。通过设置UIScrollView属性，如zoom比例、内容尺寸等，配合UIImageView显示图片，并通过自定义viewForZooming方法实现图片缩放功能；同时，通过启用分页功能实现页面间流畅滚动。

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创建

let scroll = UIScrollView()

        scroll.frame = self.view.bounds
        scroll.showsVerticalScrollIndicator = false
        scroll.showsHorizontalScrollIndicator = false
        scroll.indicatorStyle = .default

let imagev = UIImageView.init(image: UIImage(named:"2"))

// 设置范围

scroll.contentSize = CGSize.init(width: 400, height: 800)
scroll.addSubview(imagev)

self.view.addSubview(scroll)

1、实现放大缩小

scroll.minimumZoomScale = 0.1
scroll.maximumZoomScale = 3
scroll.delegate = self

     func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        for subview: AnyObject in scrollView.subviews {
           if subview.isKind(of: UIImageView.self) {
                return subview as? UIView
         }
     }
       return nil
   }

2、页单元的滚动

class ViewController: UIViewController{

    let numberPages = 3
    let pageWidth = 320
    let pageHeight = 360






      override func viewDidLoad() {
        super.viewDidLoad()

        let scrollView = UIScrollView()
        scrollView.frame = self.view.bounds
        scrollView.contentSize = CGSize.init(width: pageWidth * numberPages, height: pageHeight)
        scrollView.isPagingEnabled = true
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.showsVerticalScrollIndicator = false
        scrollView.scrollsToTop = false
        for i in 0...numberPages {
            let myView = UIView.init(frame: CGRect.init(x: pageWidth * i, y: 0, width: pageWidth, height: pageHeight))
            myView.backgroundColor = UIColor.init(colorLiteralRed: Float(arc4random()%240 + 1)/255.0, green: Float(arc4random()%240 + 1)/255.0, blue: Float(arc4random()%240 + 1)/255.0, alpha: 1)
            scrollView.addSubview(myView)
        }
        self.view.addSubview(scrollView)

    }

没有太仔细写，以后有时间补上吧