objective|适配web view 高度

//初始化,self.view是父控件/
_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];


//delegate的方法重载
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
//获取页面高度(像素)
NSString * clientheight_str = [webView stringByEvaluatingJavaScriptFromString: @"document.body.clientHeight"];
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').clientHeight + 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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