Question

我希望用URL加载Webview并获取内容（图像）。然后将其缩放以在小尺寸的WebView或Imageview中正确显示。

怎么做？

谢谢，

Answer 1

在你的webView委托中尝试这样的事情：

- (void)webViewDidFinishLoad:(UIWebView *)webView
{

  CGSize thumbsize = CGSizeMake(100,100);

  UIGraphicsBeginImageContext(thumbsize);
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGFloat scalingFactor = thumbsize.width/webView.frame.size.width;
  CGContextScaleCTM(context, scalingFactor,scalingFactor);

  [webView.layer renderInContext: UIGraphicsGetCurrentContext()];

  UIImage *thumbImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  //throw it on screen, just for testing
  UIImageView *imgView = [[[UIImageView alloc] initWithImage:thumbImage] autorelease];
  [self.view addSubview:imgView];
}

Answer 2

在大多数情况下，你从UIView的CALayer中制作UIImage。有关详细信息，请参阅How to take an iPhone screenshot of entire view including parts off screen?。

然后您可以调整图像大小：

The simplest way to resize an UIImage?

如何从UIWebview渲染图像

2 个答案: