Swift 如何在UIWebView中捕获整个HTML页面（包括溢出）？

下面的代码捕获屏幕，但不是web视图的整个页面：

func screenShotMethod() {
    //Create the UIImage
    UIGraphicsBeginImageContext(view.frame.size)
    view.layer.renderInContext(UIGraphicsGetCurrentContext())
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    //Save it to the camera roll
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}

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如何在UIWebView中捕获整个HTML页面（包括溢出）？

我知道已经很晚了，但这一个可以帮助其他人：

let webViewFrame = uiWebViewObj.frame
let scrollViewOffset = uiWebViewObj.scrollView.contentOffset
if webView.scrollView.contentSize.width == 0 || webView.scrollView.contentSize.height == 0{
  // nothing to take screenshot of 
}
//Set the scrollView offset to top of the web Page
uiWebViewObj.scrollView.setContentOffset(CGPointMake(0, -webView.scrollView.contentInset.top), animated: false)
let screenRect =  UIScreen.mainScreen().bounds
uiWebViewObj.frame = CGRectMake(webViewFrame.origin.x, webViewFrame.origin.y, screenRect.size.width, uiWebViewObj.scrollView.contentSize.height)
 let cgSizeToUse = CGSizeMake(screenRect.size.width, uiWebViewObj.scrollView.contentSize.height)
autoreleasepool{
    UIGraphicsBeginImageContextWithOptions(cgSizeToUse, false, 0) 
    uiWebViewObj.layer.renderInContext(UIGraphicsGetCurrentContext())
    let image = UIGraphicsGetImageFromCurrentContext()
    UIGraphicsEndImageContext()
}

uiWebViewObj.frame = webViewFrame
uiWebObj.scrollView.contentOffset = scrollViewOffset

参考链接：

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让webview和上下文的高度都变大。我对这方面还不熟悉。请说得更具体些。