CODEWITHSUNDEEP
iphoneobjective-ccocoa-touch
JoJo
JoJo

Reputation: 20115

Disable back/forward button in web browser

In my app, I have a UIWebView. Beneath it, I have a toolbar with the back and forward buttons to control the browser. How do I disable the back button when the user is on the initial page and disable the forward button when the user is on the most recent page? Looking at the UIWebViewDelegate protocol, I don't see any callbacks that tell me the position of the user in their browser history.

It should look like Safari's toolbar:

enter image description here

Edit: I figured out the detection part, but I can't figure out the disabling part. My buttons always remain at full opacity and are tappable even when NSLog prints out 0 for canGoBack or canGoForward.

.h

@interface VeetleViewController : UIViewController <UIWebViewDelegate> {
    UIWebView* webView;
    UIBarButtonItem* buttonBack;
    UIBarButtonItem* buttonForward;
    UIActivityIndicatorView* activityIndicator;
}

- (void)activityIndicatorStop;

@property (nonatomic, retain) IBOutlet UIWebView* webView;
@property (nonatomic, retain) IBOutlet UIBarButtonItem* buttonBack;
@property (nonatomic, retain) IBOutlet UIBarButtonItem* buttonForward;
@property (nonatomic, retain) UIActivityIndicatorView* activityIndicator;

@end

.m

- (void)webViewDidStartLoad:(UIWebView *)webView
{
    NSLog(@"canGoBack:%d canGoForward:%d", self.webView.canGoBack, self.webView.canGoForward); 

    [self.activityIndicator startAnimating];

    if (self.webView.canGoBack) {
        self.buttonBack.enabled = YES;
    } else {
        self.buttonBack.enabled = NO;
    }

    if (self.webView.canGoForward) {
        self.buttonForward.enabled = YES;
    } else {
        self.buttonForward.enabled = NO;
    }
}

Upvotes: 1

Views: 1607

Answers (2)

Gaurav
Gaurav

Reputation: 561

Just implement in one of the delegate methods of web view:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    [backbutton setEnabled:[webView canGoBack]];
    [fwdbutton setEnabled:[webView canGoForward]];
}

Upvotes: 0

NWCoder
NWCoder

Reputation: 5266

It's properties on the UIWebView, not the delegate.

see: canGoBack and canGoForward.

http://developer.apple.com/library/ios/documentation/uikit/reference/UIWebView_Class/Reference/Reference.html#//apple_ref/occ/instp/UIWebView/canGoBack

Upvotes: 2

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