UIWebView适配

@2x  会导致web高度x2

_webView = [[UIWebView alloc] initWithFrame: CGRectMake(0, 0, self.view.frame.size.width, 0)];

_webView.delegate = self;
_webView.scrollView.bounces = NO;
_webView.scrollView.showsHorizontalScrollIndicator = NO;
_webView.scrollView.scrollEnabled = NO;
[_webView sizeToFit];


///设置内容，这里包装一层div，用来获取内容实际高度（像素），htmlcontent是html格式的字符串//
NSString * htmlcontent = [NSString stringWithFormat:@"

%@

", htmlcontent];
[_webView loadHTMLString:htmlcontent baseURL:nil];



- (void)webViewDidFinishLoad:(UIWebView *)webView
{
//获取页面高度（像素）
NSString * clientheight_str = [webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"];
float clientheight = [clientheight_str floatValue];
//设置到WebView上
webView.frame = CGRectMake(0, 0, self.view.frame.size.width, clientheight);
//获取WebView最佳尺寸（点）
CGSize frame = [webView sizeThatFits:webView.frame.size];
//获取内容实际高度（像素）
NSString * height_str= [webView stringByEvaluatingJavaScriptFromString: @"document.getElementById('webview_content_wrapper').offsetHeight + parseInt(window.getComputedStyle(document.getElementsByTagName('body')[0]).getPropertyValue('margin-top'))  + parseInt(window.getComputedStyle(document.getElementsByTagName('body')[0]).getPropertyValue('margin-bottom'))"];
float height = [height_str floatValue];
//内容实际高度（像素）* 点和像素的比
height = height * frame.height / clientheight;
//再次设置WebView高度（点）
webView.frame = CGRectMake(0, 0, self.view.frame.size.width, height);

}

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