Question

I have a UIWebView being created programatically as follows;

- (void)loadView {
UIView *webNewsView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
self.view = webNewsView;    

CGRect webFrame = [[UIScreen mainScreen] applicationFrame];
webFrame.origin.y = 0.0f;
webNews = [[UIWebView alloc] initWithFrame:webFrame];
webNews.backgroundColor = [UIColor clearColor];
webNews.scalesPageToFit = YES;
webNews.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
webNews.delegate = self;
webNews.dataDetectorTypes = UIDataDetectorTypeNone;
[self.view addSubview: webNews];
[webNews loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://..........MYURL......./"]]];

}

I also have the following delegate methods;

I am attempting to remove all links within the UIWebView so my user cannot navigate away from the URL that I have coded in. I have tried the following to change color of links;

- (void)webViewDidFinishLoad:(UIWebView *)webView {
[webNews stringByEvaluatingJavaScriptFromString:@"document.styleSheets[0].addRule(\"a.link\", \"color:#FFFFFF\")"];
}

I have read examples of people using javascript to remove all links from UIWebView but I can’t seem to get this working. Can anyone provide an example within the method of what I need to do?

Answer 1

Are you sure that the only way for the user to navigate from the page you’re loading is by touching A elements? What about form submit buttons or JavaScript event handlers that set window.location?

As far as I know, the bulletproof way to prevent navigation is to implement webView: shouldStartLoadWithRequest: navigationType to return NO except on the first request:

@interface MyDelegate <UIWebViewDelegate>
{
    BOOL didStartFirstRequest;
}
@end

@implementation MyDelegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    if (didStartFirstRequest)
        return NO;
    didStartFirstRequest = YES;
    return YES;
}
@end

UPDATE

UIWebView has been deprecated for a while now in favor of WKWebView. If you are using WKWebView, you’ll want to set its navigationDelegate, and in the delegate, implement the webView(_:decidePolicyFor:preferences:decisionHandler:) method.