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[操作系统]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
            }
        }
    }
}