我正在建造一个迷宫，并为墙壁添加了一些 SKSpritekit 节点，并为玩家添加了一个点。但是，当点和墙壁发生碰撞时，不会检测到碰撞。我的代码如下：
import UIKit
import SpriteKit
import GameplayKit
import Foundation
import GameplayKit
class level1: SKScene, SKPhysicsContactDelegate {
var entities = [GKEntity]()
var graphs = [String : GKGraph]()
var dot = SKSpriteNode()
override func sceneDidLoad () {
buildMaze()
addDot()
func addDot() {
let startNum = x * (y - 1)
startCoord = coordArray[startNum]
dot = SKSpriteNode(imageNamed: "redDot")
dot.physicsBody?.isDynamic = true
dot.size = CGSize(width: 20, height: 20)
dot.position = startCoord
dot.physicsBody = SKPhysicsBody(circleOfRadius: 10)
dot.physicsBody?.mass = 0
dot.physicsBody?.usesPreciseCollisionDetection = true
self.addChild(dot)
}
func buildMaze() {
let difference = coordArray[1].x - coordArray[0].x
let wallDistance = difference/2
let thickness = CGFloat(3)
let length = difference - CGFloat(thickness)/2
var count = 0
for point in coordArray {
let northWall = SKSpriteNode(color: SKColor.black, size : CGSize (width: length, height: thickness))
northWall.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: length, height: thickness))
northWall.physicsBody?.mass = 200000
let southWall = SKSpriteNode(color: SKColor.black, size : CGSize (width: length, height: thickness))
southWall.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: length, height: thickness))
southWall.physicsBody?.mass = 200000
let eastWall = SKSpriteNode(color: SKColor.black, size : CGSize (width: thickness, height: length ))
eastWall.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: thickness, height: length))
eastWall.physicsBody?.mass = 200000
let westWall = SKSpriteNode(color: SKColor.black, size : CGSize (width: thickness, height: length ))
westWall.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: thickness, height: length))
westWall.physicsBody?.mass = 200000
if !instructions[count].contains("N") {
//print("added north wall")
northWall.position = CGPoint (x: point.x , y: point.y + wallDistance)
if nodes(at: northWall.position) == [] {
addChild(northWall)}
else {print("north wall already there")}
}
if !instructions[count].contains("S") {
//print("added south wall")
southWall.position = CGPoint (x: point.x , y: point.y - wallDistance)
if nodes(at: southWall.position) == [] {
addChild(southWall)}
else {//print("southwall already there")
}
}
if !instructions[count].contains("E") {
//print("added east wall")
eastWall.position = CGPoint (x: point.x + wallDistance , y: point.y)
if nodes(at: eastWall.position) == [] {
addChild(eastWall)}
else {//print("east already there")
}
}
if !instructions[count].contains("W") {
//print("added west wall")
westWall.position = CGPoint (x: point.x - wallDistance , y: point.y)
if nodes(at: westWall.position) == [] {
addChild(westWall)}
else {//print("west wall already there")
}
}
count = count + 1
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for t in touches {
let location = t.location(in: self)
dot.position.x = location.x
dot.position.y = location.y
}
}
func didBegin(_ contact: SKPhysicsContact) {
print("contact!")
}
墙壁就像我想要的那样出现，并且点也在正确的位置。
我为它们中的每一个添加了 20000 的质量，这样当我移动点时，墙壁保持在原位。然而，当我用手指移动点时，它只是直接穿过迷宫的墙壁，而不是被它们阻止。
我在 didBegin 函数中添加了一条打印语句，以查看它是否至少检测到精灵之间的任何接触，但它没有。
为什么是这样？
干杯！