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Editorial Team
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Asked: 2026-05-22T12:12:47+00:00

In a WebView i am loading html file.The html page is displayed with black

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In a WebView i am loading html file.The html page is displayed with black background.
I want it to be semitransparent. If I set setAlphaValue: then webview content transparency changes. Is there a way to set (or control) transparency of html background.

Editing html file would be last option.

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1 Answer

  1. Editorial Team

    Option 1: Edit the HTML or CSS:

    <body style="background-color: transparent">
body{background-color:transparent;}

    Option 2: Apply the transparency using JavaScript:

    evaluateWebScript:

    EDIT

    Snippet related to second option:

    NSString * source = @"<html><head><title></title></head><body><div id=\"box\">Example Box</div></body></html>";
[[webView mainFrame] loadHTMLString:source baseURL:[NSURL URLWithString:@""] ];
[[webView windowScriptObject] evaluateWebScript:@"document.getElementById('box').style.backgroundColor = '#dddddd';"]; // Change box background
[[webView windowScriptObject] evaluateWebScript:@"document.body.style.backgroundColor = '#dddddd';"]; // Change body background
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