在2个视图控制器之间进行筛选（模态）

Question

I am using the modal segue to navigate between 2 view controllers. Below is the 2 segue's I setup.

The purpose of the Segue is to navigate back and forth between the store url screen and the web view screen.

I don't want to use a navigation controller as this is NOT a common use case and I don't want the user to go back easily.

1. Is there a way to prevent a segue from happening? (I want to present a warning first)

2. Is this the proper use of segues?

Answer 1

The - (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender gets called before the segue is being executed. Here you can do a check and return false if you don't want the segue to go through.