Swift 3 SpriteKit Détecter les contacts

Question

Je suis novice en matière de rapidité et j'ai essayé de comprendre comment utiliser les bitmasks et didBegin (_ contact: SKPhysicsContact) pour détecter quand deux vaisseaux spatiaux se touchent. Je n'arrive pas à comprendre comment.

Voici ce que j'ai jusqu'à présent:

import SpriteKit 
import GameplayKit 

class GameScene: SKScene, SKPhysicsContactDelegate { 

let pufferCategory: UInt32 = 1 << 0; 

let enemyCategory: UInt32 = 1 << 1; 

var spaceship1: SKSpriteNode! 
var spaceship2: SKSpriteNode! 

override func didMove(to view: SKView) { 
    spaceship1 = SKSpriteNode(imageNamed: "Spaceship"); 
    spaceship1.setScale(CGFloat(0.1)) 
    spaceship1.position = CGPoint(x: self.frame.width/2, y: (self.frame.height/2)); 
    spaceship1.name = "spaceship1"; 


    spaceship1.physicsBody = SKPhysicsBody(circleOfRadius: spaceship1.size.width/2); 
    spaceship1.physicsBody?.isDynamic = true // apply gravity, friction, and collision 
    spaceship1.physicsBody?.affectedByGravity = false; 
    spaceship1.physicsBody?.allowsRotation = false 
    spaceship1.physicsBody = SKPhysicsBody(circleOfRadius: spaceship1.size.width/2); 
    spaceship1.physicsBody?.categoryBitMask = pufferCategory 
    spaceship1.physicsBody?.contactTestBitMask = enemyCategory 

    spaceship2 = SKSpriteNode(imageNamed: "Spaceship"); 
    spaceship2.setScale(CGFloat(0.1)) 
    spaceship2.position = CGPoint(x: self.frame.width/2, y: (spaceship1.position.y + 300)); 
    spaceship2.name = "puffer2"; 

    spaceship2.physicsBody = SKPhysicsBody(circleOfRadius: spaceship2.size.width/2); 
    spaceship2.physicsBody?.isDynamic = true // apply gravity, friction, and collision 
    spaceship2.physicsBody?.affectedByGravity = false; 
    spaceship2.physicsBody?.allowsRotation = false 
    spaceship2.physicsBody = SKPhysicsBody(circleOfRadius: spaceship2.size.width/2); 
    spaceship2.physicsBody?.categoryBitMask = enemyCategory 
    spaceship2.physicsBody?.contactTestBitMask = pufferCategory 

    addChild(spaceship1) 
    addChild(spaceship2) 
} 

func didBegin(_ contact: SKPhysicsContact) { 
    print("contact") 
} 

    override func update(_ currentTime: TimeInterval) { 
     spaceship1.physicsBody?.affectedByGravity = false; 
    } 
} 

Merci à l'avance!

Answer 1

Je l'ai compris!

Voici mon code :)

import SpriteKit 
import GameplayKit 

class GameScene: SKScene, SKPhysicsContactDelegate { 

let enemy2Category: UInt32 = 1 

let enemyCategory: UInt32 = 2 

var spaceship1: SKSpriteNode! 
var spaceship2: SKSpriteNode! 

override func didMove(to view: SKView) { 
    self.physicsWorld.contactDelegate = self 
    spaceship1 = SKSpriteNode(imageNamed: "Spaceship"); 
    spaceship1.setScale(CGFloat(0.1)) 
    spaceship1.position = CGPoint(x: self.frame.width/2, y: (self.frame.height/2)); 
    spaceship1.name = "spaceship1"; 


    spaceship1.physicsBody = SKPhysicsBody(circleOfRadius: spaceship1.size.width/2); 
    spaceship1.physicsBody?.isDynamic = true // apply gravity, friction, and collision 
    spaceship1.physicsBody?.affectedByGravity = false; 
    spaceship1.physicsBody?.allowsRotation = false 
    spaceship1.physicsBody = SKPhysicsBody(circleOfRadius: spaceship1.size.width/2); 
    spaceship1.physicsBody?.categoryBitMask = enemy2Category 
    spaceship1.physicsBody?.collisionBitMask = enemyCategory 
    spaceship1.physicsBody?.contactTestBitMask = enemyCategory 

    spaceship2 = SKSpriteNode(imageNamed: "Spaceship"); 
    spaceship2.setScale(CGFloat(0.1)) 
    spaceship2.position = CGPoint(x: self.frame.width/2, y: (spaceship1.position.y + 300)); 
    spaceship2.name = "spaceship2"; 

    spaceship2.physicsBody = SKPhysicsBody(circleOfRadius: spaceship2.size.width/2); 
    spaceship2.physicsBody?.isDynamic = true // apply gravity, friction, and collision 
    spaceship2.physicsBody?.affectedByGravity = false; 
    spaceship2.physicsBody?.allowsRotation = false 
    spaceship2.physicsBody = SKPhysicsBody(circleOfRadius: spaceship2.size.width/2); 
    spaceship2.physicsBody?.categoryBitMask = enemyCategory 
    spaceship2.physicsBody?.collisionBitMask = enemy2Category 
    spaceship2.physicsBody?.contactTestBitMask = enemy2Category 

    addChild(spaceship1) 
    addChild(spaceship2) 
} 

func didBegin(_ contact: SKPhysicsContact) { 
    print("contact") 
} 

    override func update(_ currentTime: TimeInterval) { 
     spaceship1.physicsBody?.affectedByGravity = false; 
    } 
} 

J'ai utilisé cette vidéo pour aider: https://www.youtube.com/watch?v=43hzb4NmQfw