Reference to the segue source view controller

Question

Within my viewDidLoad I would like some custom code based upon the previous controller.

How can I access the segue source controller or the previous segue identifier in the destination controller's viewDidLoad to handle this?

Strangle

Do you mean in the destination controller? You're last sentence is not clear. – Numerical

Answer 1

There is no way to get a reference to the segue that created you. You could create a property (sourceVC in my example) in the destination controller, and assign self to this property in the prepareForSegue method (in the source view controller):

[(DestinationVCClass *)segue.destinationViewController sourceVC] = self;

Numerical

Answer 2

You can just use [self presentingViewController] and you'll be able to access the VC that issued the segue. I usually like to couple it with isMemberOfClass: for a situation like this.

Herby

This will only work if the segue is modal, it won't work for a push. – Numerical

It sounds like he's talking about a modal segue, but yeah good call. – Herby

I get my rootViewController by calling this method, so it seems the logic is a bit broken. – Mammillate

Answer 3

You do the following in the unwinding segue method in the destination

self.source = (UIStoryboardSegue *)segue.sourceViewController;

Define source as a UIStoryboardSegue in the destination. The above line will give the source or the previous segue.

Buddhology