Swift physics不支持iOS7

我有一个简单的SpriteKit游戏，使用物理。用Swift编写，在iOS8模拟器中运行良好。 节点停止在physicsworld边缘

但当在iOS7上运行时，它正好跌入谷底。认为它与类别、接触和碰撞位掩码有关

有线索吗

在这里定义类别

struct PhysicsCategory {
    static let None: UInt32 = 0
    static let Edge: UInt32 = 0b1 // 1
    static let Player: UInt32 = 0b10 // 2
    static let Enemy: UInt32 = 0b100 // 4
}

设置世界

physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
physicsWorld.contactDelegate = self
physicsBody!.categoryBitMask = PhysicsCategory.Edge
physicsWorld.gravity = CGVectorMake(0, -9.81)

设置球员/球/节点

playerNode.physicsBody = SKPhysicsBody(polygonFromPath: path)
playerNode.physicsBody!.contactTestBitMask = PhysicsCategory.Player
playerNode.physicsBody!.dynamic = true
playerNode.physicsBody!.mass = 0.50
playerNode.physicsBody!.categoryBitMask = PhysicsCategory.Player
playerNode.physicsBody!.collisionBitMask = PhysicsCategory.Enemy | PhysicsCategory.Edge

---

嗯，我没有这个问题。我几乎一字不差地写了你的代码。我假设playerNode是一个SKShapeNode，并在polygonFromPath中使用了它的路径。您可以尝试在iOS7中运行它，看看是否仍然存在问题吗

struct PhysicsCategory {
    static let None: UInt32 = 0
    static let Edge: UInt32 = 0b1 // 1
    static let Player: UInt32 = 0b10 // 2
    static let Enemy: UInt32 = 0b100 // 4
}

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {

    let playerNode = SKShapeNode(ellipseInRect: CGRect(origin: CGPointZero, size: CGSize(width: 10, height: 10)))

    override func didMoveToView(view: SKView) {

        physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
        physicsWorld.contactDelegate = self
        physicsBody!.categoryBitMask = PhysicsCategory.Edge
        physicsWorld.gravity = CGVectorMake(0, -9.81)

        self.addChild(playerNode)


        playerNode.position = CGPoint(x: self.size.width/2, y: self.size.height/2)
        playerNode.physicsBody = SKPhysicsBody(polygonFromPath: playerNode.path)
        playerNode.physicsBody!.dynamic = true
        playerNode.physicsBody!.mass = 0.50
        playerNode.physicsBody!.categoryBitMask = PhysicsCategory.Player
        playerNode.physicsBody!.collisionBitMask = PhysicsCategory.Enemy | PhysicsCategory.Edge
    }

}

---

终于成功了

---

更新到Yosemite 10.10.1和Xcode 6.1.1，创建了一个新项目。奇怪，但现在效果很好。

谢谢，但这根本不起作用。我没有使用SKShapeNode，playerNode是来自图像的SkSpriteNode，但我已经为PhysicsBody创建了自定义路径。-[SKShapeNode shapeNodeWithEllipseInRect:]：发送到类0x10b5aa168的无法识别的选择器。-根据文档，shapeNodeWithEllipseInRect似乎只适用于iOS8及以上版本。啊，是的。这是有道理的。ios8发布后，他们为skshapenode制作了一些新的初始值设定项。