如何從UIWebview呈現圖像

Question

我正在尋找使用URL加載Webview並獲取內容（圖像）的。然後將其縮放以適當地顯示在WebView或Imageview的小尺寸中。

如何做到這一點？

感謝，

Answer 1

在大多數情況下，你作出的UIImage了一個UIView的CALayer的的。詳情請參閱How to take an iPhone screenshot of entire view including parts off screen?。

然後，您可以調整圖像大小：

The simplest way to resize an UIImage?

Answer 2

嘗試像這樣在網頁視圖委託：

- (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]; 
}