iOS segues data not being passed - ios

Question

Data is not being passed from one VC to another, can't for the life of me figure it out. I'm trying to pass an NSURL or NSURLRequest and when I log out the request/url object on the second VC, I get null.
First VC.h
#import <UIKit/UIKit.h>
#import "ILAuthClient.h"
#import "ILAuthLoginViewController.h"
#interface ILViewController : UIViewController
#property (strong, nonatomic) NSString *string;
#property (strong, nonatomic) NSURL *request;
#end
First VC.m (relevant section)
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.identifier isEqualToString:#"authLogin"]){
NSURL *url = [self authenticateWithInstagram];
ILAuthLoginViewController *authModal = [[ILAuthLoginViewController alloc]init];
authModal.delegate = self;
authModal.url = url;}
Second VC.h
#import <UIKit/UIKit.h>
#interface ILAuthLoginViewController : UIViewController <UIWebViewDelegate>
#property (strong, nonatomic) IBOutlet UIWebView *webView;
#property (strong, nonatomic) NSURLRequest *request;
#property (strong, nonatomic) NSURL *url;
#property (strong, nonatomic) NSString *string;
#end
Second VC.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.webView.delegate = self;
self.request = [[NSURLRequest alloc]initWithURL:self.url];
[self.webView loadRequest:self.request];
NSLog(#"Request %#", self.request);
}

Answer 1

When you enter prepareForSegue your second view controller has already been allocated for you and is available as the destinationViewController property on the segue. You are allocating a new one and assigning properties but this object isn't used.
Your method should be
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.identifier isEqualToString:#"authLogin"]){
NSURL *url = [self authenticateWithInstagram];
ILAuthLoginViewController *authModal = (ILAuthLoginViewController *)segue.destinationViewController;
authModal.delegate = self;
authModal.url = url;
}
}

Answer 2

This line ...
ILAuthLoginViewController *authModal = [[ILAuthLoginViewController alloc]init];
should be changed to this
ILAuthLoginViewController * authModal = (ILAuthLoginViewController *) segue.destinationViewController;
The one you are allocing isn't the one the storyboard is presenting

Answer 3

Two things to check for.
1.Your call is wrong while passing through segue. It should be
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.identifier isEqualToString:#"authLogin"]){
NSURL *url = [self authenticateWithInstagram];
ILAuthLoginViewController *authModal = (ILAuthLoginViewController *)segue.destinationViewController;
authModal.delegate = self;
authModal.url = url;
}
}
2.Make sure your url string is well formed.
NSURL *url = [NSURL URLWithString:[#"YOURURL" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
Hope its helpful.