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I'm developing an iOS 4 application using iOS SDK latest version and XCode 4.2.

I have a XIB with a `UIWebView` with **Alpha = 1.0**, **Background** set to **Clear Color** and **Opaque** is not set. On this XIB I setup an image as background with this code:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"AboutBackground.png"]];
self.view.backgroundColor = background;
[background release];
}
return self;
}

The `UIWebView` is showing an static html:

<html><head></head><body style=\"margin:0 auto;text-align:center;background-color: transparent; color:white\">...</body></html>

On iOS 5 simulator, its background is transparent, but on an iOS 4 device is grey.

Any clue?

Besides setting your webview's background to clear color, also make sure that you set opaque to false.

Also set :

[webView setBackgroundColor:[UIColor clearColor]];
[webView setOpaque:NO];

/*for ios please set this*/

[webViewFirst setOpaque:NO];

/*for html please set this*/
<body style="background:none">

webView.opaque = NO;

webView.backgroundColor = [UIColor clearColor];

You can try this code (i know, that it's unsafe, but it works even for ios5):
<blink><pre><code>- (void)makeBodyBackgroundTransparent {
for (UIView *subview in [webView subviews]) {
[subview setOpaque:NO];
[subview setBackgroundColor:[UIColor clearColor]];
}
[webView setOpaque:NO];
[webView setBackgroundColor:[UIColor clearColor]];
}</code></pre></blink>

NSString *content=@"example clear background color UIWebview";
NSString *style=[NSString stringwithformat:@"<html><head><style>body {background-color:transparent;}</style></head><body>%@</body></html>",content];
[myWebview loadhtmlstring:style baseurl:nil];

For Objective

webView.opaque = NO;
webView.backgroundColor = [UIColor clearColor];

Please make sure to include this into your HTML code:

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

<body style="background:none">

Latest Swift Version (as required):

lazy var webView: UIWebView = {
let view = UIWebView()
view.delegate = self
view.backgroundColor = .clear
view.isOpaque = false
return view
}()

*Remove delegate line if not required*

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