Pass a parameter to prepareForSegue from function - ios

Question

I have to functions, both of them trigger performSegueWithIdentifier with the same segue. But depending of which function was called I need to pass different parameters in prepareForSegue.
Some thing like
func first() {
// do some stuff
performSegueWithIdentifier("My segue", sender:AnyObject?)
}
func second() {
// do some stuff
performSegueWithIdentifier("My segue", sender:AnyObject?)
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "My segue" {
let destination = segue.destinationViewController as! MyController
if functionFirstWasCalled {
destination.property = value
} else if functionSecondWasCalled {
destination.property = anotherValue
}
}
}
Surely, I can do this by setting booleans from second() and first() and then checking them in prepareForSegue - but maybe there is some more elegant way to do this ?

Answer 1

In objective -c you would do:
[self performSegueWithIdentifier:#"segueNAme" sender:#"firstMethod"];
and you can access this message in the prepareForSegue method
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([sender isEqualToString:#"firstMethod"]) {
//firstMEthod called the segue
}
}
The swift equivalent I think would be:
self.performSegueWithIdentifier("segueNAme", sender: "firstMethod")
and
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject) {
if (sender == "firstMethod") {
//firstMEthod called the segue
}
}
My suggestion would be to instead of sending a plain string , send a dictionary type object that contains the methodName, className and some other params useful for future debugging.

Answer 2

All you have to do is send a flag by sender attribute, something like this:
func first() {
performSegueWithIdentifier("My segue", sender:true)
}
func second() {
// do some stuff
performSegueWithIdentifier("My segue", sender:false)
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "My segue" {
let destination = segue.destinationViewController as! MyController
let isFirstFunctionCalled = sender as! Bool // cast sender to bool
if isFirstFunctionCalled {
destination.property = value
} else {
destination.property = anotherValue
}
}
}

Answer 3

Simply set parallel properties in this View Controller which you then pass to the destination View Controller based on the function called. i.e:
var a = ""
var b = 0
func first() {
// do some stuff
a = "first function determined this variable."
b = 1
performSegueWithIdentifier("My segue", sender:AnyObject?)
}
func second() {
// do some stuff
a = "second function determined this variable."
b = 182
performSegueWithIdentifier("My segue", sender:AnyObject?)
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "My segue" {
let destination = segue.destinationViewController as! MyController
if functionFirstWasCalled {
destination.property = a
} else if functionSecondWasCalled {
destination.property = b
}
}
}