在swift中获取所有webview的完整屏幕截图

有谁知道如何使用 swift中的代码(不是屏幕,因为webview很长,我们必须滚动查看所有内容)并通过UIActivityViewController共享它,我可以为我的所有Web视图拍摄完整的屏幕截图？ 加载Web视图后,请尝试以下代码：

编辑：在模拟器中运行此代码,然后检查文档应用程序目录中的screenshot.jpeg文件

class ViewController: UIViewController,UIWebViewDelegate {

let fileDirectory = NSSearchPathForDirectoriesInDomains(
    .DocumentDirectory, .UserDomainMask, true)

@IBOutlet weak var webView: UIWebView!

override func viewDidLoad() {


    var urlPath = "http://www.bbc.com/"
    let requestUrl = NSURL(string: urlPath)
    let request = NSURLRequest(URL: requestUrl!)
    webView.loadRequest(request)
    webView.delegate = self

}

func webViewDidFinishLoad(webView: UIWebView) {


    if (!webView.loading){

        var webViewFrame = webView.frame

        webView.frame = CGRectMake(webViewFrame.origin.x, webViewFrame.origin.y, webView.scrollView.contentSize.width, webView.scrollView.contentSize.height)

        UIGraphicsBeginImageContextWithOptions(webView.scrollView.contentSize, false, 0);
        self.webView.layer.renderInContext(UIGraphicsGetCurrentContext())
        var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();
        var imageData = UIImageJPEGRepresentation(image, 0.7)
        var currentFileName = "screenshot.jpeg"
        var imageFilePath = fileDirectory[0].stringByAppendingPathComponent(currentFileName)
        var imageFileURL = NSURL(fileURLWithPath: imageFilePath)
        imageData.writeToURL(imageFileURL!, atomically: false)
        webView.frame = webViewFrame
    }
}

}