UIWebView不会缩放内容以适应

Question

我有一个webview,它是层次结构中的顶层窗口,已声明如下所示.但是,它不会缩放页面以适应.尽管scalesPageToFit属性设置为YES,页面仍然是左上对齐,但未缩放.任何帮助将不胜感激.

webLookupView = [[UIWebView alloc] initWithFrame:CGRectMake(16, 63, 289, 327)];
webLookupView.backgroundColor = [UIColor lightGrayColor];
webLookupView.dataDetectorTypes = UIDataDetectorTypeAll;
webLookupView.scalesPageToFit = YES;

Answer 1

iOS5提供了更好的解决方案

从webViewDidFinishLoad中调用它

- (void)zoomToFit
{ 
    if ([theWebView respondsToSelector:@selector(scrollView)])
    {
        UIScrollView *scrollView = [theWebView scrollView];

        float zoom = theWebView.bounds.size.width / scrollView.contentSize.width;
        scrollView.minimumZoomScale = zoom;
        [scrollView setZoomScale:zoom animated:YES];
    }
}

Answer 2

我后来发现有些网页是正确缩放的,但有些则没有.对于未正确缩放的网页,可以使用javascript控制缩放,如下所示:

NSString *jsCommand = [NSString stringWithFormat:@"document.body.style.zoom = 1.5;"];
[webLookupView stringByEvaluatingJavaScriptFromString:jsCommand];

Answer 3

您可以使用以下代码:

self.webView.scalesPageToFit = YES;
self.webView.contentMode = UIViewContentModeScaleAspectFit;

在- (void)webViewDidFinishLoad:(UIWebView *)webView method 或viewDidLoad

Answer 4

如果您有权访问正在加载的html,则可以在标题中删除以下元标记:

<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;" />

Answer 5

在Swift2中

self.webView.scalesPageToFit = true
self.webView.contentMode = UIViewContentMode.ScaleAspectFit