ios - ScrollView 不缩放和水平滚动一起吗？

Question

我是 iOS 编程新手。我想做缩放和水平滚动。当页面加载后，我无法向上滚动以进行捏合。当我捏合时，我就可以滚动。这是什么原因？

这是我的代码。

override func viewDidLoad() {
    super.viewDidLoad()
    scrollview.delegate = self
    //mark:- for scrolling
    let scrollViewFrame = scrollview.frame
    let scaleWidth = scrollViewFrame.size.width / scrollview.contentSize.width
    let scaleHeight = scrollViewFrame.size.height / scrollview.contentSize.height
    let minScale = min(scaleWidth, scaleHeight);
    scrollview.minimumZoomScale = minScale;

    scrollview.maximumZoomScale = 1.0
    scrollview.zoomScale = 0.8


}
override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    statsView.drawStatsView(color: #colorLiteral(red: 0.9529411793, green: 0.6862745285, blue: 0.1333333403, alpha: 1), average: 100, min: 90, max: 110, name: "H")
    statsView.drawStatsView(color: #colorLiteral(red: 0.7450980544, green: 0.1568627506, blue: 0.07450980693, alpha: 1), average: 120, min: 102, max: 122, name: "A")
    statsView.drawStatsView(color: #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1), average: 145, min: 130, max: 150, name: "Y")
}
override func viewDidLayoutSubviews() {
   // bunu bi düşün containera statsView.Container.addConstraint()
    scrollview.contentSize = CGSize(width: 720, height: scrollview.frame.height)
    scrollview.alwaysBounceHorizontal = false
    scrollview.bounces = false
    scrollview.clipsToBounds = true

}

func viewForZooming(in scrollView: UIScrollView) -> UIView? {
    print("we re zooming yey")
    return statsView
}

Answer 1

三个步骤:

1. 首先:确保 ScrollView 的最大缩放比例更大高于默认值 1.0。如果出现以下情况，您可以在 Interface Builder 中更改此设置:您想要的，或者在代码中使用 maximumZoomScale 属性。
2. 使您的 View Controller 成为 ScrollView 的委托(delegate)。

3. 使您的 View Controller 符合 UIScrollViewDelegate 协议(protocol)，然后添加 viewForZooming(in:)

   func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? { 
   return imageView
   }