UIScrollView 缩放 uiview 到纵横填充 [英] UIScrollView zoom uiview to aspect fill

问题描述

我在 UIScrollView 中有一个图像，我试图让它默认为纵横填充，下面的代码按照第一张附加图像中列出的方式缩放它.但这不是我所期望的，如何正确扩展?

I have an image in the UIScrollView and I'm trying to make it aspect fill by default, the code below scale it as listed on the first attached image. But it's not what I expect, how to scale it properly?

    func aspectFill() {
        let imageSize = imageZoomView.bounds.size

        let xScale = bounds.width / imageSize.width
        let yScale = bounds.height / imageSize.height

        zoomScale = max(xScale, yScale)
    }

但预期的结果是

推荐答案

垂直和横向图像方向的解决方案:

Solution for both vertical and landscape image orientations:

let widthRatio = sourseImageSize.width / sourseImageSize.height
let height = scrollView.bounds.width / widthRatio
let zoomScaleH = scrollView.bounds.height / height
    
let heightRatio = sourseImageSize.height / sourseImageSize.width
let width = scrollView.bounds.height / heightRatio
let zoomScaleW = scrollView.bounds.width / width

let scaleResult = max(zoomScaleH, zoomScaleW)

scrollView.setZoomScale(scaleResult, animated: false)

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