Swift：如何在webView中仅更改<img>或图像大小

Question

我从服务器获取HTML并将其显示在UIWebView中。由于要求，未选择“Scale Page to fit”选项。 UIWebView宽度等于屏幕宽度和高度根据内容而变化。 HTML中的图像标记包含一些内联样式，这些样式在webView视图中产生了一些问题。 屏幕截图已附上

在1st Image中，您可以看到图像很小，因为它的小尺寸设置为内联样式。 但是第二个有更大的图像，所以图像越界。

有没有办法控制图像的宽度等于屏幕宽度/ UIWebview宽度？

Answer 1

这是我用来省略HTML中的宽度和高度的代码。 然后uiwebview调整屏幕宽度内的图像

func HTMLImageCorrector(HTMLString: String) -> String {
    var HTMLToBeReturned = HTMLString
    while HTMLToBeReturned.rangeOfString("(?<=width=\")[^\" height]+", options: .RegularExpressionSearch) != nil{
        if let match = HTMLToBeReturned.rangeOfString("(?<=width=\")[^\" height]+", options: .RegularExpressionSearch) {
            HTMLToBeReturned.removeRange(match)
            if let match2 = HTMLToBeReturned.rangeOfString("(?<=height=\")[^\"]+", options: .RegularExpressionSearch) {
                HTMLToBeReturned.removeRange(match2)
                let string2del = "width=\"\" height=\"\""
                HTMLToBeReturned = HTMLToBeReturned.stringByReplacingOccurrencesOfString( string2del, withString: "")
            }
        }

    }

    return HTMLToBeReturned
}

Answer 2

您可以为HTML正文添加样式：

let styleContent = "<html><head><style>img{width:100%;};</style></head>" 
+ "<body style='margin:0; padding:0;'>" + (your html body) + "</body></html>";

Answer 3

这是HTMLImageCorrector的swift 4版本：

func HTMLImageCorrector(HTMLString: String) -> String {
    var HTMLToBeReturned = HTMLString
    while HTMLToBeReturned.range(of: "(?<=width=\")[^\" height]+", options: .regularExpression) != nil{
        if let match = HTMLToBeReturned.range(of:"(?<=width=\")[^\" height]+", options: .regularExpression) {
            HTMLToBeReturned.removeSubrange(match)
            if let match2 = HTMLToBeReturned.range(of:"(?<=height=\")[^\"]+", options: .regularExpression) {
                HTMLToBeReturned.removeSubrange(match2)
                let string2del = "width=\"\" height=\"\""
                HTMLToBeReturned = HTMLToBeReturned.replacingOccurrences(of:string2del, with: "")
            }
        }
    }

    return HTMLToBeReturned
}

Answer 4

斯威夫特3

extension String {

func HTMLImageCorrector() -> String {
    var HTMLToBeReturned = self
    while HTMLToBeReturned.range(of: "(?<=width=\")[^\" height]+", options: .regularExpression) != nil{
        if let match = HTMLToBeReturned.range(of: "(?<=width=\")[^\" height]+", options: .regularExpression) {
            HTMLToBeReturned.removeSubrange(match)
            if let match2 = HTMLToBeReturned.range(of: "(?<=height=\")[^\"]+", options: .regularExpression) {
                HTMLToBeReturned.removeSubrange(match2)
                let string2del = "width=\"\" height=\"\""
                HTMLToBeReturned = HTMLToBeReturned.replacingOccurrences(of: string2del, with: "style=\"width: 100%\"")
            }
        }

    }

    return HTMLToBeReturned
}
}