Multiple Buttons with a Single Segue - ios

Question

I have four buttons and one segue. When any of these buttons get touch up inside event, it will load respective images on the destination view controller. For that, I am recognizing buttons through their tag property [each button (0,1,2,3)]. Here is my code:
- (IBAction)Session1Btn:(id)sender {
[self performSegueWithIdentifier:#"isSection" sender:self];
}
- (IBAction)Session2Btn:(id)sender {
[self performSegueWithIdentifier:#"isSection" sender:self];
}
- (IBAction)Session3Btn:(id)sender {
[self performSegueWithIdentifier:#"isSection" sender:self];
}
- (IBAction)Session4Btn:(id)sender {
[self performSegueWithIdentifier:#"isSection" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
SectionViewController *sVC=[segue destinationViewController];
if([segue.identifier isEqualToString:#"isSection"])
{
// the following line gives an error!
NSInteger tagIndex = [(UIButton *)sender tag];
[sVC setSelectedButton:[NSNumber numberWithInteger:tagIndex]];
}
}
However I am getting the following error:

Answer 1

You must have written UIButton UITouchUpInside event like this:
- (IBAction)buttonPressed:(id)sender
{
[self performSegueWithIdentifier:#"isSection" sender:sender];
}
Same way for all your buttons.
Now add one variable UIButton *selectedButton in .h file. and update your button event methods like below:
- (IBAction)buttonPressed:(id)sender
{
selectedButton = (UIButton *)sender;
[self performSegueWithIdentifier:#"isSection" sender:sender];
}
And now you have selectedButton reference, which can be used in other methods. So that,
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(UIButton *)sender {
SectionViewController *sVC=[segue destinationViewController];
if([segue.identifier isEqualToString:#"isSection"])
{
[sVC setSelectedButton:[NSNumber numberWithInteger: selectedButton.tag]];
}
}

Answer 2

Swift
Create property for the selected button:
var selectedButton: Int = Int()
In each IBAction assign selectedButton to either 1 or 2 and add performSegue(withIdentifier: "yourSegueIdentifier", sender: self).
In prepare for segue add the following:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if buttonTapped == 1 {
// what ever happens when first button selected
} else if buttonTapped == 2 {
// what ever happens when second button selected
}
}