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Web View is not working. Please help!

So I am new to Objective-C

I have a table view populated with links that the user has added. When the user clicks on one of the cells in the table view, they are guided to a second view controller with a web view that displays the website of the link. However, when I run the app the web view appears blank. What am I doing wrong?

Table view . m

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"showWebsite"]) {

        UITableViewCell *cell = (UITableViewCell*)sender;
        NSURL *url = [NSURL URLWithString:cell.textLabel.text];
        NSString *string = url.absoluteString;
        SecondViewController *vc = [segue destinationViewController];
        vc.url = string;

Second view controller . m

NSURL *URL = [NSURL URLWithString:[self.url
                                       stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];

    NSURLRequest *request = [NSURLRequest requestWithURL:URL];
    [self.webView loadRequest:request];