iphone - UIWebView 到 UIImage

Question

我尝试使用此方法从 UIWebView 捕获图像，但图像仅包含屏幕的可见区域。如何捕获 UIWebView 的全部内容，包括不可见区域，即整个网页变成一个图像？

-(UIImage*)captureScreen:(UIView*) viewToCapture{
  UIGraphicsBeginImageContext(viewToCapture.bounds.size);
  [viewToCapture.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return viewImage;
}

Answer 1

检查一下 Rendering a UIWebView into an ImageContext

或者只使用这个 :) :

    (UIImage*) imageFromWebview:(UIWebView*) webview{

//store the original framesize to put it back after the snapshot
CGRect originalFrame = webview.frame;

//get the width and height of webpage using js (you might need to use another call, this doesn't work always)
int webViewHeight = [[webview stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight;"] integerValue];
int webViewWidth = [[webview stringByEvaluatingJavaScriptFromString:@"document.body.scrollWidth;"] integerValue];

//set the webview's frames to match the size of the page
[webview setFrame:CGRectMake(0, 0, webViewWidth, webViewHeight)];

//make the snapshot
UIGraphicsBeginImageContextWithOptions(webview.frame.size, false, 0.0);
[webview.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

//set the webview's frame to the original size
[webview setFrame:originalFrame];

//and VOILA :)
return image;
}