当两个 SK 节点相交时标记

问：

在我的 swift 代码中，在一个名为 stick 的节点周围移动的左右按钮下方。我希望用户点击使摇杆与边界相交的按钮。debug 部分将打印 “flag”。我知道在 uikit 中有一个相交命令，但我不知道 sprite kit。蓝绿色是界限

在此处输入图像描述

import SpriteKit
import GameplayKit


class GameScene: SKScene , SKPhysicsContactDelegate {
    
    var stick: SKSpriteNode!
    var leftButton: SKSpriteNode!
    var rightButton: SKSpriteNode!
    var bounds: SKSpriteNode!
    
    
    var objectThatHandlesContactLogic: ContactDetectionLogic!

   
    
    override func didMove(to view: SKView) {
        physicsWorld.contactDelegate = self  // << from the previous step

          backgroundColor = SKColor.white
              
        objectThatHandlesContactLogic = ContactDetectionLogic()
           
        physicsWorld.contactDelegate = objectThatHandlesContactLogic
        
        // Create left and right buttons
        leftButton = SKSpriteNode(color: .blue, size: CGSize(width: 100, height: 50))
        leftButton.position = CGPoint(x: size.width * 0.2, y: size.height * 0.1)
        addChild(leftButton)
        
        rightButton = SKSpriteNode(color: .red, size: CGSize(width: 100, height: 50))
        rightButton.position = CGPoint(x: size.width * -0.1, y: size.height * 0.1)
        addChild(rightButton)
          // Create and position the stick
        physicsWorld.contactDelegate = self  // << from the previous step

            backgroundColor = SKColor.white
                
            // Create and position the stick
            let stickSize = CGSize(width: 160, height: 20)
            stick = SKSpriteNode(color: .brown, size: stickSize)
            stick.position = CGPoint(x: size.width * -0.2, y: size.height * -0.1)
            addChild(stick)
                
            // Add physics body to stick
            stick.physicsBody = SKPhysicsBody(rectangleOf: stickSize)
            stick.physicsBody!.categoryBitMask = 0b0000  // Means the stick doesn't belong to any category (all zeros)
            stick.physicsBody!.collisionBitMask = 0b0000  // Means the stick collides with no category, i.e., doesn't collide with anything (all zeros)
            stick.physicsBody!.contactTestBitMask = 0b0001  // Means the stick will only collide with nodes belonging to category 0001 (in binary. This also happens to mean category "1" in decimal)
            
            stick.physicsBody!.affectedByGravity = false  // since you dont want it falling off of the screen
            
            // Create and position the bounds box
            let boundsSize = CGSize(width: 150, height: 300)
            bounds = SKSpriteNode(color: .systemTeal, size: boundsSize)
            bounds.position = CGPoint(x: size.width * -0.4, y: size.height * -0.2)
            addChild(bounds)
                
            // add physics body to bounds
            bounds.physicsBody = SKPhysicsBody(rectangleOf: boundsSize)
            bounds.physicsBody!.collisionBitMask = 0b0000  // Means bounds collides with no category (all zeros)
            bounds.physicsBody!.categoryBitMask = 0b0001  // Means the bounds belongs to category 0001 (in binary. Which again, translates to "1" in decimal), which if you remember, is what we set the stick to collide with

            // the default value for bounds.physicsBody!.contactBitMask
            // is already 0b0000 so no need to set it explicitly here.
            // (You could do it for consistency sake if you'd like but it
            // wouldn't matter since you're setting it to the same value it
            // already is)
            
            bounds.physicsBody!.affectedByGravity = false  // since you dont want it falling off of the screen

            // ...blah blah blah all the other code
    }
    
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)

            if leftButton.contains(location) {
                // Rotate the stick counterclockwise
                let rotateAction = SKAction.rotate(byAngle: CGFloat(Double.pi / 4), duration: 1.0)
                stick.run(rotateAction)
                print("hit Left")
            }

            if rightButton.contains(location) {
                // Rotate the stick clockwise
                let rotateAction = SKAction.rotate(byAngle: -CGFloat(Double.pi / 4), duration: 1.0)
                stick.run(rotateAction)
            }
        }
    }

}


class ContactDetectionLogic: NSObject, SKPhysicsContactDelegate {  // << Make sure you also add NSObject
    // if you add this function, this function will be called when a contact between two nodes begins
    func didBegin(_ contact: SKPhysicsContact) {
        print("flag")
    }
}

在这种情况下，我不认为相交是一种选择。