How can I make an action to occur when two buttons are pressed at the same time?

Question

I want my character to jump whenever I press two buttons at the same time. I've already tried this:

if rightButton.contains(location) && leftButton.contains(location) {
    character.physicsBody?.applyImpulse(CGVector(dx: 0, dy: 50))
}

Answer 1

First of all, make sure in GameViewController.swift you have multitouch enabled.

class GameViewController: UIViewController
{
    override func viewDidLoad()
    {
        super.viewDidLoad()

        // ...

        if let view = self.view as! SKView?
        {
            // ...

            view.isMultipleTouchEnabled = true
        }
    }
}

In GameScene give name to your buttons. On tap we will create a list of every node your fingers touched that has a name. If the list contains both right and left button, it means he pressed both at the same time.

class GameScene: SKScene
{
    override func didMove(to view: SKView)
    {
        // add name to each button

        left_button.name  = "left_button"
        right_button.name = "right_button"
    }

    func buttons_touched(_ touches: Set<UITouch>) -> [String]
    {
        // get the list of buttons we touched on each tap

        var button_list : [String] = []

        for touch in touches
        {
            let positionInScene = touch.location(in: self)
            let touchedNode = self.nodes(at: positionInScene)

            let buttons = touchedNode.compactMap { (node) -> String in
                node.name ?? ""
            }.filter({$0 != ""})

            button_list += buttons
        }

        return button_list
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
    {
        let buttons_tapped = buttons_touched(touches)

        if buttons_tapped.contains("right_button") && buttons_tapped.contains("left_button")
        {
            // jump code
        }
    }
}

You can simulate multitouch inside Simulator by holding Option button.