ios - UIWebview 删除填充/边距

Question

我正在将 PDF 加载到 UIWebview 中，我将背景颜色更改为清除并将不透明设置为 false。但是，现在我想删除 UIWebView 中的填充或边距，所以 UIWebview 就是屏幕。

我像这样创建了一个 UIWebview:

let webview = UIWebView()
webview.frame = self.view.bounds
webview.scrollView.frame = webview.frame
webview.userInteractionEnabled = true
webview.scalesPageToFit = true
webview.becomeFirstResponder()
webview.delegate = self
webview.scrollView.delegate = self
webview.opaque = false
webview.backgroundColor = UIColor.clearColor()
self.view.addSubview(webview)
webview.loadRequest(NSURLRequest(URL:url))
webview.gestureRecognizers = [pinchRecognizer, panRecognizer]

我将其应用于 webViewDidFinishLoad 方法

func webViewDidFinishLoad(webView: UIWebView) {
        let padding = "document.body.style.margin='0';document.body.style.padding = '0'"
        webView.stringByEvaluatingJavaScriptFromString(padding)
}

但是还是有padding或者margin，看起来是这样的:

我该如何解决这个问题？

我需要这个修复的原因是因为我要将这个 UIWebView 保存为 PDF，当我保存它时，还有额外的间距，这是我的 PDF 生成代码:

func drawPDFUsingPrintPageRenderer(printPageRenderer: UIPrintPageRenderer) -> NSData! {

        let data = NSMutableData()


        UIGraphicsBeginPDFContextToData(data, CGRectZero, nil)


        UIGraphicsBeginPDFPage()


        printPageRenderer.drawPageAtIndex(0, inRect: UIGraphicsGetPDFContextBounds())


        UIGraphicsEndPDFContext()


        return data
    }

还有更多

let screenHeight = appDelegate.webview!.scrollView.bounds.size.height

        let heightStr = appDelegate.webview!.scrollView.bounds.size.height

        let height = heightStr

        let pages = ceil(height / screenHeight)

        let pdfMutableData = NSMutableData()

        UIGraphicsBeginPDFContextToData(pdfMutableData, appDelegate.webview!.scrollView.bounds, nil)

        for i in 0..<Int(pages)
        {

            if (CGFloat((i+1)) * screenHeight  > CGFloat(height)) {
                var f = appDelegate.webview!.scrollView.frame
                f.size.height -= ((CGFloat((i+1)) * screenHeight) - CGFloat(height));
                appDelegate.webview!.scrollView.frame = f
            }

            UIGraphicsBeginPDFPage()

            let currentContext = UIGraphicsGetCurrentContext()

            appDelegate.webview!.scrollView.setContentOffset(CGPointMake(0, screenHeight * CGFloat(i)), animated: false)

            appDelegate.webview!.scrollView.layer.renderInContext(currentContext!)

        }

        UIGraphicsEndPDFContext()

Answer 1

当 Web View 位于原点时，将 ScrollView 框架设置为 Web View 框架将无效，否则会产生不良影响。

调整 ScrollView contentInset:

// set t,l,b,r to be negative CGFloat values that suit your content
webView.scrollView.contentInset = UIEdgeInsetsMake(t,l,b,r);