ios webview自适应实际内容高度4种方法

有的时候会碰见类似的苦逼需求， webview自适应实际内容高度 下面有四种方法供使用

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

 

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-(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

 

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-(void)webViewDidFinishLoad:(UIWebView *)webView{     CGFloat webViewHeight= [[webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"]floatValue]; // CGFloat webViewHeight= [[webView stringByEvaluatingJavaScriptFromString: @"document.body.scrollHeight"]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

 

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-(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

 

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-(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             }         }     } }