Is it possible to call a performSegueWithIdentifier from another class? - ios

Question

I just build a class to manage correctly my database and JSON request. The problem is that now, how can I perform the segue ?
Here is my code
In my view :
- (IBAction)loginClick:(id)sender
{
NSString *post = [NSString stringWithFormat:#"username=test&password=test"];
[[DataManagement sharedManager] WebServiceLogin:post];
}
- (void) showTypeView
{
[self performSegueWithIdentifier:#"showTypeView" sender:nil];
}
In my class :
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
...
switch ([[response valueForKey:#"success"] intValue])
{
case 0:
{
NSLog(#"error: %# error Description: %#", [response valueForKey:#"success"], [response valueForKey:#"error_message"]);
break;
}
case 1:
{
LoginViewController *showView = [LoginViewController new];
[showView showTypeView];
break;
}
default:
break;
}
...
}
When I launch, I have an error :
**
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Receiver (<LoginViewController: 0x165afd30>) has no segue with identifier 'showTypeView''
*** First throw call stack:
(0x2592e2eb 0x250fadff 0x29e2b037 0xe1819 0xdb64f 0x25f64de1 0x25f64d99 0x25f64e8d 0x25e261ef 0x25edf04f 0xa77cab 0xa7f835 0x25e171e3 0x258415f9 0x25e170cb 0x25e16f95 0x25e16e29 0x258f1257 0x258f0e47 0x258ef1af 0x25841bb9 0x258419ad 0x26abbaf9 0x29b2dfb5 0xe3ea9 0x254f4873)
libc++abi.dylib: terminating with uncaught exception of type NSException
**

Answer 1

If you're using segueWithIdentifier then you need to already have the segue built in Storyboard and labeled correctly as "showTypeView". Otherwise you should use a navigation controller to push a view controller or use self presentViewController to show a modal view controller.
EDIT:
Building off of Larme's comment, you can build a delegate like this:
// In your class.h file
#property (weak, nonatomic)id<SegueDelegate> delegate;
// In class.m file
LoginViewController *showView = [LoginViewController new];
self.delegate = showView;
[self.delegate segue];
// In LoginViewController.h
#protocol SegueDelegate
-(void)segue;
#end
#interface LoginViewController: UIViewController <SegueDelegate>
-(void)segue;
#end
// In LoginViewController.m
#implementation LoginViewController
-(void)segue
{
[self performSegueWithIdentifier:#"showTypeView" sender:nil];
}
#end