Pass Data to and Open a ViewController Inside Navigation Controller - ios

Question

I have a standalone UIViewController with a UIWebView. I need to check if a certain URL has been hit, and if so, present a new UIViewController inside of a UINavigationController.
Here is my code:
-(BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = request.URL;
NSString *urlString = url.absoluteString;
//Check if special link
if ( [ urlString isEqualToString: #"http://www.mysite.com/store" ] ) {
//Here present the new view controller
StoreViewController *controller = [[StoreViewController alloc] init];
[self presentViewController:controller animated:YES completion: nil];
return NO;
}
return YES;
}
However, when I run the app, I get the following error:
WebKit threw an uncaught exception in the method
webView:decidePolicyForNavigationAction:request:frame:decisionListener:
delegate:
<'NSInvalidArgumentException'> * -[__NSArrayM insertObject:atIndex:]:
object cannot be nil
If I try and open the UINavigationController itself it works fine...but then how do I pass data to the StoreViewController itself?

Answer 1

Let's try these solutions:
Destroy webview's delegate in your view controller:
-(void)dealloc{ self.yourWebView.delegate = nil}
Stop request from webView:
-(BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
StoreViewController *controller = [[StoreViewController alloc] init];
[self presentViewController:controller animated:YES completion: nil];
//stop loading here
[webview stopLoading];
return NO;
}
Double check in new view controller, do you have any array which it's element is assigned to nil
Hope this helps you

Answer 2

Lets go through the problems one by one:
WebKit Exception: You can resolve this by stopping the webview loading. Just call [webView stopLoading];
Pass data: If you declare your required data in the StoreViewController.h you can easily set them when you are initializing the view controller.
StoreViewController *controller = [[StoreViewController alloc] init];
controller.myStringData = #"Required Data";
controller.myDataDictionary = someDictionary;
You will be able to get the data in the viewDidLoad method of StoreViewController
Hope this helps.