UIWebView background is set to Clear Color, but it is not transparent
IphoneObjective CIosCocoa TouchUiwebviewIphone Problem Overview
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?
Iphone Solutions
Solution 1 - Iphone
Also set :
[webView setBackgroundColor:[UIColor clearColor]];
[webView setOpaque:NO];
Solution 2 - Iphone
/*for ios please set this*/
[webViewFirst setOpaque:NO];
/*for html please set this*/
<body style="background:none">
Solution 3 - Iphone
Besides setting your webview's background to clear color, also make sure that you set opaque to false.
Solution 4 - Iphone
You can try this code (i know, that it's unsafe, but it works even for ios5):
- (void)makeBodyBackgroundTransparent {
for (UIView *subview in [webView subviews]) {
[subview setOpaque:NO];
[subview setBackgroundColor:[UIColor clearColor]];
}
[webView setOpaque:NO];
[webView setBackgroundColor:[UIColor clearColor]];
}Solution 5 - Iphone
webView.opaque = NO;
webView.backgroundColor = [UIColor clearColor];
Solution 6 - Iphone
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];
Solution 7 - Iphone
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
Solution 8 - Iphone
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">