iOS-UIWebView加载html图文详情图片自适应高度

快来打我* 2023-10-16 23:34 54阅读 0赞

创建webView
    
            web_info.scrollView.scrollEnabled =YES;
            web_info.delegate =self;
            
            web_info.scrollView.bounces =NO;
            web_info.scrollView.showsHorizontalScrollIndicator = NO;
            [web_infosizeToFit];
            
            NSString *htmlcontent = [NSStringstringWithFormat:@"<div id=\"webview_content_wrapper\">%@</div>", htmlText];
            [cell.web_infoloadHTMLString:htmlcontentbaseURL:nil];
    1、
    - (void)webViewDidFinishLoad:(UIWebView *)webView
    {
        //获取页面高度（像素）
        NSString * clientheight_str = [webViewstringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"];
        float clientheight = [clientheight_strfloatValue] /2;
        //设置到WebView上
        webView.frame =CGRectMake(0,0,ScreenWidth, clientheight);
        //获取WebView最佳尺寸（点）
        CGSize frame = [webViewsizeThatFits:webView.frame.size];
        //获取内容实际高度（像素）
        NSString * height_str= [webViewstringByEvaluatingJavaScriptFromString:@"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_strfloatValue] /2;
        //内容实际高度（像素）*点和像素的比
        //height = height * frame.height / clientheight;
        
        offsetHeight = height * frame.height / clientheight;
        //再次设置WebView高度（点）
        //webView.frame = CGRectMake(0, 0, self.view.frame.size.width, height);
    }
    
    2、
    - (void)webViewDidFinishLoad:(UIWebView *)webView
    {
    CGFloat webViewHeight=[webView.scrollView contentSize].height;
    CGRect newFrame = webView.frame;
    newFrame.size.height = webViewHeight;
    webView.frame = newFrame;
    _webTablewView.contentSize = CGSizeMake(320, newFrame.size.height + 64 + KWIDTH - 100);
     
    }
    
    
    3、.执行js语句 直接获取html文档的dom高度
    - (void)webViewDidFinishLoad:(UIWebView *)webView{
    CGFloatwebViewHeight =[[webViewstringByEvaluatingJavaScriptFromString:@document.body.offsetHeight]floatValue];
    // CGFloat webViewHeight= [[webViewstringByEvaluatingJavaScriptFromString:@document.body.scrollHeight]floatValue];
    CGRectnewFrame = webView.frame;
    newFrame.size.height= webViewHeight;
    webView.frame= newFrame;
    }
    
    4、先将UIWebView的高度设为最小，然后再使用sizeThatFits就会返回刚好合适的大小 （本人使用 ，可行）
    -(void)webViewDidFinishLoad:(UIWebView*)webView{
    //    CGSize actualSize = [webView sizeThatFits:CGSizeZero];
    //    
    //    CGRect newFrame = webView.frame;
    //    
    //    newFrame.size.height = actualSize.height;
    //    
    //    webView.frame = newFrame;
        //sizeThatFits方法有个问题，如果当前UIView的大小比刚好合适的大小还大，则返回当前的大小，不会返回最合适的大小值，所以使用 sizeThatFits前，先将UIWebView的高度设为最小，即1，然后再使用sizeThatFits就会返回刚好合适的大小。
        CGRect frame = webView.frame;
        frame.size.height =1;
        webView.frame = frame;
        CGSize fittingSize = [webViewsizeThatFits:CGSizeZero];
        frame.size = fittingSize;
        webView.frame = frame;
        offsetHeight = webView.frame.size.height;
    }
    
    5、遍历webview子视图 获取UIWebDocumentView高度即实际高度
    -(void)webViewDidFinishLoad:(UIWebView *)webView{
    CGFloat webViewHeight = 0.0f;
    if([webView.subviews count] > 0)
    {
    UIView *scrollerView = webView.subviews[0];
    if([scrollerView.subviews count] >
    0)
    {
    UIView *webDocView = scrollerView.subviews.lastObject;
    if ([webDocView isKindOfClass:[NSClassFromString(@UIWebDocumentView)class]])
    {
    webViewHeight = webDocView.frame.size.height;//获取文档的高度
    webView.frame=webDocView.frame;
    //更新UIWebView的高度
    }
    }
    }
    }