iphone - 为 UIWebView 设置最大缩放比例

Question

我尝试通过以下方式为 UIWebview 设置最大缩放比例

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

但做不到。如果有人有任何想法，请告诉..

Answer 1

按照以下步骤:

1) 添加静态const float zoomSc = 3.0;同时在.h文件中添加UIScrollViewDelegate

2) 你的WebView.scrollView.delegate = self;

3) 在scrollView委托(delegate)方法下方添加

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

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

编辑:更改缩放系数的范围

在 UIWebViewDelegate 的 方法中添加以下内容。

注意:不要忘记为 UIWebView

设置委托(delegate)

- (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()"];
}