将图像大小限制为 ScrollView、Swift

debugcn 发表于 Dev

真实的

我有一个设置在滚动视图中的图像，尽管我已将 scrollView 的框架设置为固定的高度和宽度，如下所示，但图像超出了边界（见下图）。

如何限制图片以适合滚动视图。

imageScrollView.frame = CGRect(x: 0, y: 0, width: viewWidth, height: viewHeight-50)
imageScrollView.clipsToBounds = true // Has no affect on the image

唐麦格

您正在使用的库经过编码以将缩放比例与设备方向相匹配。因此，如果图像方向与视图方向不匹配，则最终图像将不太适合滚动视图。

您需要编辑ImageScrollView.swift源文件。假设您使用的版本与您提供的链接 ( https://github.com/huynguyencong/ImageScrollView ) 中的当前版本相同，请setMaxMinZoomScalesForCurrentBounds()按如下方式更改函数：

fileprivate func setMaxMinZoomScalesForCurrentBounds() {
    // calculate min/max zoomscale
    let xScale = bounds.width / imageSize.width    // the scale needed to perfectly fit the image width-wise
    let yScale = bounds.height / imageSize.height   // the scale needed to perfectly fit the image height-wise

    // fill width if the image and phone are both portrait or both landscape; otherwise take smaller scale
    //let imagePortrait = imageSize.height > imageSize.width
    //let phonePortrait = bounds.height >= bounds.width
    //var minScale = (imagePortrait == phonePortrait) ? xScale : min(xScale, yScale)
    //
    // just take the min scale, so the image will completely fit regardless of orientation
    var minScale = min(xScale, yScale)

    let maxScale = maxScaleFromMinScale*minScale

    // don't let minScale exceed maxScale. (If the image is smaller than the screen, we don't want to force it to be zoomed.)
    if minScale > maxScale {
        minScale = maxScale
    }

    maximumZoomScale = maxScale
    minimumZoomScale = minScale * 0.999 // the multiply factor to prevent user cannot scroll page while they use this control in UIPageViewController
}

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