如何使一部分Web视图略微半透明？ [英] How To Make Part of Web View Slightly Translucent?

问题描述

Objective-C 与 Mac OSX Cocoa ，是否有任何方法使 DIV 在 WebView 稍微半透明，以便窗口后面的桌面应用程序泄漏稍微，但只有 DIV ，而不是 WebView 的其余部分

In Objective-C with Mac OSX Cocoa, is there any way to make a DIV on a WebView slightly translucent so that the desktop applications behind the window bleed through slightly, but only on that DIV and not the rest of the WebView?

或者我可以让整个WebView半透明，但关闭所有 DIV ，除了一个 DIV ？

Or perhaps I can make the whole WebView translucent, but turn it off for all DIVs except one DIV?

我有一个 WebView 加载网页。在网页中，我有一个侧边栏在左边，然后一个 IFRAME 在右边。我单击侧栏上的项目，他们更改了右侧的 IFRAME 页面。

I have a WebView loading a web page. In the web page, I have a sidebar on the left, and then an IFRAME on the right. I click items on the sidebar and they change the IFRAME pages on the right. It's this sidebar that I want to make slightly translucent.

在我的 AppDelegate.m 中，我有这个，我的 HTML 和 BODY 标记设置为 background：none ，我的侧边栏设置为 background：rgba（0,0,0,0.5），但我最后看到的是一个灰色边栏背景。这就像webview本身想要确保它的背景设置为一个不同于清晰的颜色。

In my AppDelegate.m, I have this so far, and my HTML and BODY tags are set to background:none, and my sidebar is set to background:rgba(0,0,0,0.5), but all I end up seeing is a grey sidebar background. It's like the webview itself wants to ensure that it's background is set to a color other than clear.

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
  // note that _window and _wv are outlet properties to my window and webview widgets
  [_window setBackgroundColor:[NSColor clearColor]];
  [_window setOpaque:NO];

  [_wv.layer setBackgroundColor:[NSColor clearColor].CGColor];
  [_wv.layer setOpaque:NO];
}

推荐答案

a href =https://developer.apple.com/library/mac/documentation/Cocoa/Reference/WebKit/Classes/WebView_Class/#//apple_ref/occ/instp/WebView/drawsBackground =nofollow> 实例到 NO 的 drawsBackground ，然后确保使用CSS填充您想要不透明的页面的部分。

Yes, just set the drawsBackground property of your WebView instance to NO, then make sure to fill the parts of the page you want opaque using CSS.

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