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Code is not working!!! HELP!

So I have a table view with urls the user has added. When they click on a cell the user is guided to a second view controller with a web view displaying the website of the url. However, the web view appears blank.


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

UITableViewCell *cell = (UITableViewCell*)sender;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
        WebViewController *vc = [segue destinationViewController];
        NSURL *url = [NSURL URLWithString:cell.textLabel.text];
        NSString *string = url.absoluteString;
        vc.url = string;


- (void)viewDidLoad {
    [super viewDidLoad];
    NSURL *URL = [NSURL URLWithString:[self.url
                                       stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];

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

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