ios webview自適應實際內容高度4種方法

標籤：

有的時候會碰見類似的苦逼需求， webview自適應實際內容高度 下面有四種方法供使用

方法1：擷取webview中scrovllview的contentsize進行設定

 

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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：執行js語句 直接擷取html文檔的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.先將UIWebView的高度設為最小，然後再使用sizeThatFits就會返回剛好合適的大小

 

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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.遍曆webview子視圖 擷取UIWebDocumentView高度即實際高度

 

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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;//擷取文檔的高度                webView.frame= webDocView.frame; //更新UIWebView 的高度            }        }    }}

ios webview自適應實際內容高度4種方法