Can't change background for UIWebView in iOS
IosUiwebviewBackground ColorIos Problem Overview
Is there a way to change background color for UIWebView?
None of the colors set in IB effect UIWebView behavior: before actual content is loaded it shows as up as white (causing a white flash between the moment it is loaded and content is rendered).
Setting background color programmatically does not do anything either.
Here is code:
@interface Web_ViewViewController : UIViewController {
UIWebView *web;
}
@property (nonatomic, retain) IBOutlet UIWebView *web;
@end
....
-(void)viewDidLoad {
super viewDidLoad;
web.backgroundColor = [UIColor blueColor];
NSURL *clUrl = [NSURL URLWithString:@"http://www.apple.com"];
NSURLRequest *req = [NSURLRequest requestWithURL:clUrl];
[web loadRequest:req];
}
Ios Solutions
Solution 1 - Ios
You can set the opaque property of the webview to NO and then set background color of the view beneath.
[webView setOpaque:NO];
Solution 2 - Ios
Give this a try. It will fade the UIWebView in once it has finished loading and you won't see the flash.
@interface Web_ViewViewController : UIViewController <UIWebViewDelegate> {
UIWebView *web;
BOOL firstLoad;
}
@property (nonatomic, retain) IBOutlet UIWebView *web;
@end
...
(void)viewDidLoad {
[super viewDidLoad];
firstLoad = YES;
web.delegate = self;
web.alpha = 0.0;
NSURL *clUrl = [NSURL URLWithString:@"http://www.apple.com"];
NSURLRequest *req = [NSURLRequest requestWithURL:clUrl];
[web loadRequest:req];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
if (firstLoad) {
firstLoad = NO;
[UIView beginAnimations:@"web" context:nil];
web.alpha = 1.0;
[UIView commitAnimations];
}
}
The animation block in webViewDidFinishLoad will fade the view in once it's loaded, or if you prefer to have it pop on then just remove the UIView calls.
Solution 3 - Ios
None of the answers here worked for me, they all involved still some sort of flash. I found a working answer here: http://www.iphonedevsdk.com/forum/iphone-sdk-development/4918-uiwebview-render-speeds-white-background.html (I had to adjust the delay to .25 to avoid the flashing). Remember to check the UIWebView's "hidden" flag in InterfaceBuilder.
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[self performSelector:@selector(showAboutWebView) withObject:nil afterDelay:.25];
}
- (void)showAboutWebView
{
self.infoWebView.hidden = NO;
}
Solution 4 - Ios
Yes, it seems setting the backgroundColor property has no effect on the UIWebView.
I don't have a satisfactory solution, only a workaround that you can consider.
- First change the background color, by setting an initial empty HTML page
- Once that has loaded, you load your main URL (e.g. http://www.apple.com)
If you don't wait for the initial HTML page to load, you might not see the initial background while the main URL is loading. So you'll need to use the UIWebViewDelegate's webViewDidFinishLoad: method. You can implement that method in your Web_ViewViewController class, and make your Web_ViewViewController conform to the UIWebViewDelegate protocol. Initially, there is still a momentary flicker of white background until the empth HTML page loads. Not sure how to get rid of that. Below is a sample:
- (void)viewDidLoad
{
[web loadHTMLString: @"<html><body bgcolor=\"#0000FF\"></body></html>" baseURL: nil];
web.delegate = self;
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
static BOOL loadedMainURLAlready = NO;
if (!loadedMainURLAlready)
{
NSURL *clUrl = [NSURL URLWithString:@"http://apple.com"];
NSURLRequest *req = [NSURLRequest requestWithURL:clUrl];
[webView loadRequest:req];
loadedMainURLAlready = YES;
}
}
Solution 5 - Ios
I got a solution. Add the web view after it is loaded.
-(void)webViewDidFinishLoad: (UIWebView *)pageView {
self.view =pageView;
[pageView release];
}
Solution 6 - Ios
Try this out. I have used a background image "address.png" from my application resources.
NSString *path=[[NSBundle mainBundle] pathForResource:@"address" ofType:@"png"];
NSURL *a=[[NSURL alloc] initFileURLWithPath:[path stringByDeletingLastPathComponent] isDirectory:YES];
NSLog(@"%@",[a description]);
NSDictionary *d=[parsedarray objectAtIndex:0];
// generate dynamic html as you want.
NSMutableString *str=[[NSMutableString alloc] init];
[str appendString:@"<html><body background=\"address.png\"><table><tr>"];
[str appendFormat:@"<td valign=\"top\" align=\"left\"><font size=\"2\"><b>Market Address</b><br>%@,<br>%@,<br>%@</font></td>",
([d valueForKey:@"address1"])?[d valueForKey:@"address1"]:@"",
([d valueForKey:@"address2"])?[d valueForKey:@"address2"]:@"",
([d valueForKey:@"address3"])?[d valueForKey:@"address3"]:@""
];
[str appendFormat:@"<td valign=\"top\" align=\"left\"><font size=\"2\"><b>Contact Number</b><br>%@<br><b><a href=\"%@\">Email Us</a><br><a href=\"%@\">Visit Website</a></b></font></td>",
[d valueForKey:@"phone"],[d valueForKey:@"email"],[d valueForKey:@"website"]];
[str appendString:@"</tr></table></body></html>"];
// set base url to your bundle path, so that it can get image named address.png
[wvAddress loadHTMLString:str baseURL:a];
[str release]; str=nil;
[a release];
Solution 7 - Ios
In Xcode 4.6.3
- (void)viewDidLoad
{
[super viewDidLoad];
self.viewWeb.hidden = YES;
self.viewWeb.delegate = self;
// this allows the UIWebView box to your background color seamlessly.
self.viewWeb.opaque = NO;
}
Solution 8 - Ios
This might help
(Xcode 5 iOS 7) Universal App example for iOS 7 and Xcode 5. It is an open source project / example located here: https://github.com/matthewferguson/SimpleWebView.git">Link to SimpleWebView (Project Zip and Source Code Example)
webview.backgroundColor = [UIColor clearColor];