為UIWebView設置最大縮放比例

Question

我嘗試過為UIWebview設置最大縮放比例

        webView.scrollView.maximumZoomScale=2.0;
        webView.scrollView.minimumZoomScale=1.0;

但是沒能做到。 如果有任何機構有任何想法請告訴..

Answer 1

按照步驟 ：

1）添加靜態const float zoomSc = 3.0 ; 還要在.h文件中添加UIScrollViewDelegate

2） yourWebView.scrollView.delegate = self ;

3）添加下面的scrollView委托方法

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale{

  if (scale > zoomSc)
  {
    scrollView.zoomScale= zoomSc;
  }
}

編輯 ：更改zoom factor range

在UIWebViewDelegate's方法中添加以下內容。

注意 ：不要忘記為UIWebView設置委托

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
   //restrict zoomscale by adding javascript code
   //make changes to only maximum-scale value as i have set it to 10.0.
   NSString *strJSFunction = [NSString stringWithFormat:@"function increaseMaxZoomFactor(){ var element = document.createElement('meta'); element.name = \"viewport\"; element.content = \"maximum-scale=10.0\"; var head = document.getElementsByTagName('head')[0]; head.appendChild(element); }"];

  [webView stringByEvaluatingJavaScriptFromString:strJSFunction];
  [webView stringByEvaluatingJavaScriptFromString:@"increaseMaxZoomFactor()"];
}