iOS Why couldn't perform a segue in another view controller?

[pan17]

I set up a segue in a view controller say called A.
Then i want to perform this segue in another view controller called B, i did this:

A *a = [[A alloc] init];
[a performSegueWithIdentifier:@"Photos" sender:a];

Then it gives me an error says A doesn't have the corresponding segue to "Photos". But when i call this in the A view controller, then it could perform the segue without any error.
Why? Thanks

 

[ppilone]

From the UIViewController documentation for performSegueWithIdentifier:sender:

The view controller that receives this message must have been loaded from a storyboard. If the view controller does not have an associated storyboard, perhaps because you allocated and initialized it yourself, this method throws an exception.