UIWebView 底部出现黑线.如何去除?-移动开发问题

Black line appearing at bottom of UIWebView. How to remove?(UIWebView 底部出现黑线.如何去除?)

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问题描述

我在嵌入在表格单元格中的 web 视图中呈现一些 html.出于某种原因，webview 底部有一条黑线.我尝试将 webview 及其滚动视图的背景颜色设置为白色，但这并没有改变任何东西.有没有人见过这个?

I am rendering some html in a webview that is embedded in a table cell. For some reason there is a black line at the bottom of the webview. I tried setting the background color of the webview and its scrollview to white but this did not change anything. Has anyone seen this before?

这是正在呈现的 HTML:

Here is the HTML that is being rendered:

<html>
<head>

    <style type="text/css">
a {text-decoration:none;background-color:white;}
    </style>

    <title></title>
</head>

<body style="margin:0;padding:0;background-color:white;">
    <a href="http://body/" style=
    "font-family:HelveticaNeue-Light;font-size:20.000000;color:black;-webkit-tap-highlight-color:rgba(0,0,0,0);">
    Portland Blazers vs Golden State Warriors | FULL Highlights | January 26 ,
    2014 | NBA 2013-14 Season</a><span style=
    "font-family:HelveticaNeue;font-size:12.000000;color:rgb(102,102,102);white-space:nowrap;"><a href="https://www.youtube.com/watch?v=2TfldZ4w57E&amp;feature=youtube_gdata_player"
    style=
    "font-family:HelveticaNeue;font-size:12;color:rgb(102,102,102);-webkit-tap-highlight-color:rgba(0,0,0,0);"><img height="12"
    src="file:link@2x.png" width="20">www.youtube.com</a></span>
</body>
</html>

这是在 iOS7 上.

This is on iOS7.

更新:我仍然不确定是什么导致了黑线出现，但我设法通过更改我设置布局约束的方式来摆脱它.在我为视图周围的间距设置约束并让布局系统确定视图的大小之前.当 webview 完成加载其内容时，我将其更改为显式设置 webview 的高度约束.这似乎已经解决了这个问题，但我仍然不明白黑线是从哪里来的.

UPDATE: I'm still not sure what is causing the black line to appear but I managed to get rid of it by changing how I setup my layout constraints. Before I was setting constraints for the spacing around the views and letting the layout system figure out the size that the view should be. I changed it to explicitly set a height constraint of the webview when the webview finishes loading its content. This seems to have fixed the issue but I still do not understand where the black line was coming from.

推荐答案

我有同样的问题，解决方案如下:

设置UIWebView的 opaque为NO
将UIWebView的 backgroundcolor设置为clear color.

Set UIWebView's opaque to NO
Set UIWebView's backgroundcolor to clear color.

注意:以上提供的两件事都是必需的.

使用上述方案时的其他解决方案

webView.scrollView.backgroundColor = UIColor.whiteColor()

或

HTML 头部标签中的元数据

The meta to go in the head tag of HTML

<meta name="viewport" content="initial-scale=1, maximum-scale=1">

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