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iOS的WebView自適應內容高度

//
_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];

///////////////////////////////設定內容,這裡包裝一層div,用來獲取內容實際高度(畫素),htmlcontent是html格式的字串///
///////////
NSString * htmlcontent = [NSString stringWithFormat:@"<div id=\"webview_content_wrapper\">%@</div>", htmlcontent]; [_webView loadHTMLString:htmlcontent baseURL:nil]; ////////////////////////////////delegate的方法過載//////////////////////////////////////////// - (void)webViewDidFinishLoad:(UIWebView *)webView { //獲取頁面高度(畫素) NSString * clientheight_str = [webView stringByEvaluatingJavaScriptFromString: @"
document.body.offsetHeight"]; float clientheight = [clientheight_str floatValue]; //設定到WebView上 webView.frame = CGRectMake(0, 0, self.view.frame.size.width, clientheight); //獲取WebView最佳尺寸(點) CGSize frame = [webView sizeThatFits:webView.frame.size]; //獲取內容實際高度(畫素) 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]; //內容實際高度(畫素)* 點和畫素的比 height = height * frame.height / clientheight; //再次設定WebView高度(點) webView.frame = CGRectMake(0, 0, self.view.frame.size.width, height); }