我们可以限制某些网站在网络视图中打开吗

Question

I want in my app to not to open some particular sites in web view. So can we restrict any website in such a way. I want to add one more thing that i want to completely restrict a website not any particular page. Thanks in advance.

Answer 1

Yes, you can block the page from loading in this UIWebview delegate method. Remember to set the class as the webviews delegate. webView.delegate = self; , and the class needs to be UIViewController <UIWebViewDelegate>

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    if ([request.URL.absoluteString rangeOfString:@"google"].length != 0) {
        // maybe show a UIAlertView to indicate the page is blocked?
        return NO;  
    }else {
        return YES;
    }
}

EDIT: now it checks if google is mentioned in the URL, and blocks it if it contains Google

Answer 2

A little improvement : save the websites you want to block in a NSArray :

NSArray *restrictedSites = [NSArray arrayWithObjects:@"http://www.google.com", @"http://www.google.co.uk", nil];

Now check if the website requested is one of the restricted websites :

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    NSString *site = request.URL.absoluteString

    for(NSString *str in restrictedSites)
    {
        if ([site isEqualToString:str]) 
        {
            return NO;
        }
    }
    return YES;
}

Alternatively you can check if the website requested contains a URL. In th following case, all the url containing "http://www.google" or "http://www.apple" will be blocked :

First create the restricted site array :

NSArray *restrictedSites = [NSArray arrayWithObjects:@"http://www.google", @"http://www.apple", nil]; 

Now check if the website requested contains one of the restricted websites (without .com or .co.uk etc...) :

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    NSString *site = request.URL.absoluteString

    for(NSString *str in restrictedSites)
    {
        if ([site rangeOfString:str].location != NSNotFound) 
        {
            return NO;
        }
    }
    return YES;
}

So here, all http://www.google.com , http://www.google.fr , http://www.google.co.uk will be blocked.