How to get a reference to previous viewController in Swift?

Question

Can somebody help me get a reference of the previous viewController in the UINavigationController stack? I'm sure it's straight forward but I'm a bit tapped at the moment.

Answer 1

First thing array always starts with index 0, So to access previous you need to minus 2. Also the above code of your will crash with Array index out of Range, if your the index of access object is less than your count. so check your condition like this

let count = viewControllers?.count
if count > 1 {
    if let setVC = viewControllers?[count -2] as? SWSetVC {
        //Set the value
    }
}