Swift: Function Called when Back is pressed
override func viewWillDisappear(animated: Bool) {
// Do Your Lines of Code ...
}
Everytime when back button or Done is pressed or a view is popped out this function is called.. you need to override this..
Try this (copied and pasted from manecosta)
Replacing the button to a custom one as suggested on another answer is possibly not a great idea as you will lose the default behavior and style.
One other option you have is to implement the viewWillDisappear method on the View Controller and check for a property named isMovingFromParentViewController. If that property is true, it means the View Controller is disappearing because it's being removed (popped).
Should look something like:
override func viewWillDisappear(animated : Bool) {
super.viewWillDisappear(animated)
if (self.isMovingFromParentViewController()){
// Your code...
}
}
Here is the link to the other question
Try this:
override func willMoveToParentViewController(parent: UIViewController?) {
if parent == nil {
// Back button Event handler
}
}