我如何正確檢測接觸和碰撞？斯威夫特的iOS SKScene

Question

問題是我無法檢測以任何方式我已經在網上

上發現的碰撞//或接觸這是我的代碼：

我的面具的聲明：

private let ballCategory : UInt32 = 0x1 << 0 
private let holeCategory : UInt32 = 0x1 << 1 

孔都和球的添加：

func addHole(#size : CGSize) { 

    let actionMoveDown = SKAction.moveToY(CGRectGetMidY(self.frame)-500, duration: 4.7) 
    let hole = shapedHoles() 
    let UT = UTIL() 
    var position:CGFloat 


    let randomPosition = UT.randomNumberWith(Min: 1, Max: 3) 

    switch randomPosition{ 
    case 1: 
     position = CGRectGetMidX(self.frame) 
    case 2: 
     position = CGRectGetMidX(self.frame)+size.width 

    default: 
     position = CGRectGetMidX(self.frame)-(size.width) 

    } 



    var createdHole = hole.createHoleAtPosition(position: CGPointMake(position ,CGRectGetMaxY(self.frame) + (size.height/2)),size: size)//CGSizeMake(CGRectGetMaxX(self.frame)/3 - 10, 70) 

    createdHole.physicsBody = SKPhysicsBody(rectangleOfSize: createdHole.frame.size) 
    createdHole.physicsBody?.categoryBitMask = holeCategory 
    createdHole.physicsBody?.collisionBitMask = 0 
    createdHole.physicsBody?.contactTestBitMask = ballCategory 
    createdHole.physicsBody?.affectedByGravity = false 
    createdHole.physicsBody?.dynamic = false 


    lastHolePosition = randomPosition 

    createdHole .runAction(actionMoveDown) 

    self.addChild(createdHole) 



} 

func addSphere(){ 
    let mainCharacterController = circle() 
    let character: (SKNode) = mainCharacterController.createCircleAtPosition(position: CGPointMake(CGRectGetMidX(self.frame), CGRectGetMinY(self.frame)+100)) 


    character.physicsBody = SKPhysicsBody(circleOfRadius: character.frame.size.height/2) 
    character.physicsBody?.categoryBitMask = ballCategory 
    character.physicsBody?.collisionBitMask = 0 
    character.physicsBody?.contactTestBitMask = holeCategory 
    character.physicsBody?.affectedByGravity = false 
    character.physicsBody?.dynamic = false 


    self.addChild(character) 


} func addHole(#size : CGSize) { 

    let actionMoveDown = SKAction.moveToY(CGRectGetMidY(self.frame)-500, duration: 4.7) 
    let hole = shapedHoles() 
    let UT = UTIL() 
    var position:CGFloat 


    let randomPosition = UT.randomNumberWith(Min: 1, Max: 3) 

    switch randomPosition{ 
    case 1: 
     position = CGRectGetMidX(self.frame) 
    case 2: 
     position = CGRectGetMidX(self.frame)+size.width 

    default: 
     position = CGRectGetMidX(self.frame)-(size.width) 

    } 



    var createdHole = hole.createHoleAtPosition(position: CGPointMake(position ,CGRectGetMaxY(self.frame) + (size.height/2)),size: size)//CGSizeMake(CGRectGetMaxX(self.frame)/3 - 10, 70) 

    createdHole.physicsBody = SKPhysicsBody(rectangleOfSize: createdHole.frame.size) 
    createdHole.physicsBody?.categoryBitMask = holeCategory 
    createdHole.physicsBody?.collisionBitMask = 0 
    createdHole.physicsBody?.contactTestBitMask = ballCategory 
    createdHole.physicsBody?.affectedByGravity = false 
    createdHole.physicsBody?.dynamic = false 


    lastHolePosition = randomPosition 

    createdHole .runAction(actionMoveDown) 

    self.addChild(createdHole) 



} 

func addSphere(){ 
    let mainCharacterController = circle() 
    let character: (SKNode) = mainCharacterController.createCircleAtPosition(position: CGPointMake(CGRectGetMidX(self.frame), CGRectGetMinY(self.frame)+100)) 


    character.physicsBody = SKPhysicsBody(circleOfRadius: character.frame.size.height/2) 
    character.physicsBody?.categoryBitMask = ballCategory 
    character.physicsBody?.collisionBitMask = 0 
    character.physicsBody?.contactTestBitMask = holeCategory 
    character.physicsBody?.affectedByGravity = false 
    character.physicsBody?.dynamic = false 


    self.addChild(character) 


} 

最後但並非最不重要的didBeginContactMethod

func didBeginContact(contact: SKPhysicsContact) { 

    var firstBody: SKPhysicsBody! 
    var secondBody: SKPhysicsBody! 

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask { 
     firstBody = contact.bodyA 
     secondBody = contact.bodyB 
    } 
    else { 
     firstBody = contact.bodyB 
     secondBody = contact.bodyA 
    } 

    if (firstBody.categoryBitMask & holeCategory) != 0 && 
     (secondBody.categoryBitMask & ballCategory) != 0 { 
     println("HO") 
    } 
} 

謝謝你，希望你知道發生了什麼，如果你需要任何額外的代碼只是評論它

Answer 1

There is a couple things it might be. First you can try using an enum for the contact categories. 

enum collisionBodies:UInt32 { 
    case ballCategory = 1 
    case holeCategory = 2 
} 

func Collisions() { 
    character.physicsBody.categoryBitMask = collisionBodies.ballCategory.rawValue 
    character.physicsBody.contactTestBitMask = collisionBodies.holeCategory.rawValue 
    character.physicsBody.collisionBitMask = 0 

    createdHole.physicsBody.categoryBitMask = collisionBodies.holeCategory.rawValue 
    createdHole.physicsBody.contactTestBitMask = collisionBodies.ballCategory.rawValue 
    createdHole.physicsBody.collisionBitMask = 0 
} 

Also try setting one of your physics bodies to dynamic = true or collisions will likely not work. 

A better way to test for collisions in the didBeginContact function is to use a switch statement. 

func didBeginContact(contact: SKPhysicsContact) { 
    let categoryMask = contact.BodyA.categoryBitMask | contact.BodyB.categoryBitMask 

    switch (categoryMask) { 
    case collisionBodies.holeCategory.rawValue | collisionBodies.ballCategory.rawValue: 
     //code to run when contact is detected 
    default: 
    return 
} 

}

Answer 2

你必須確保你正在使用也SKScene子類實現SKPhysicsContactDelegate協議。例如，它看起來像這樣。

class MyScene : SKScene, SKPhysicsContactDelegate 

然後你必須設置你的物理世界聯繫委託給自己。

override init() { 
    self.physicsWorld.contactDelegate = self; 
} 

告訴我這是如何解決的，但它應該解決問題，併成功地讓您傾聽碰撞。