iOS webview自适应实际内容高度的4种方法

方法1：获取webview中scrovllview的contentsize进行设置

-(void)webViewDidFinishLoad:(UIWebView *)webView{
    
    CGFloat webViewHeight = [webView.scrollView contentSize].height;

    CGRect newFrame = webView.frame;
    newFrame.size.height  =  webViewHeight;
    webView.frame = newFrame;
  
}

方法2：执行js语句 直接获取html文档的dom高度

-(void)webViewDidFinishLoad:(UIWebView *)webView{
    
    CGFloat webViewHeight = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];
    
    CGRect newFrame = webView.frame;
    newFrame.size.height = webViewHeight;
    webView.frame = newFrame;
}

方法3.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

-(void)webViewDidFinishLoad:(UIWebView *)webView{
    
    CGSize actualSize = [webView sizeThatFits:CGSizeZero];

    CGRect newFrame =  webView.frame;
    newFrame.size.height = actualSize.height;
    webView.frame = newFrame;
}

方法4.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
            }
        }
    }
}