swift - enumerateChildNodesUsingBlock 调用时出现 "Cannot convert value"错误

Question

我在第四行代码上遇到错误，我在这个问题上附上了一张图片，应该可以解释一切，这可能是一个快速修复，但我从未见过它。

代码:

     let GuyScene = SCNScene(named: "art.scnassets/TestMan1.scn")
    let Guy: SCNNode = GuyScene!.rootNode.childNodeWithName("Man", recursively: true)!
    let collisionCapsuleRadius2 = CGFloat(0.1)
    let collisionCapsuleHeight2 = CGFloat(0.1)
    Guy.position = SCNVector3(x: -30.0, y: 30.0, z: 0.0)
    Guy.scale = SCNVector3Make(5, 5, 5)
    Guy.rotation = SCNVector4Make(0, 1, 0, 1 )
    //----Giveing it a physics---------
    Guy.physicsBody = SCNPhysicsBody(type: .Dynamic, shape:SCNPhysicsShape(geometry: SCNCapsule(capRadius: collisionCapsuleRadius2, height: collisionCapsuleHeight2), options:nil))
    Guy.physicsBody?.affectedByGravity = true
    Guy.physicsBody?.friction = 0 //
    Guy.physicsBody?.restitution = 1 //bounceness of the object
    Guy.physicsBody?.angularDamping = 1 // rotationess
    Guy.physicsBody?.mass = 1
    Guy.physicsBody?.rollingFriction = 0

    GuyScene!.rootNode.addChildNode(Guy)
    scnView.scene!.rootNode.addChildNode(Guy)


    func loadAnimationFromSceneNamed(path: String) -> CAAnimation {
        var scene: SCNScene = SCNScene(named: path )!
        var animation: CAAnimation? = nil
        scene.rootNode.enumerateChildNodesUsingBlock({(child: SCNNode, stop: Bool) -> Void in
            if child.animationKeys.count > 0 {
                animation = child(animationForKey: child.animationKeys[0])
                stop = true
            }
        })
        return animation!
    }

    var scenePath: String = "art.scnassets/Animation1.scn"


    var thisAnimation: CAAnimation = loadAnimationFromSceneNamed(scenePath)

    var timer = NSTimer.scheduledTimerWithTimeInterval(1.5, target: self, selector: "Start", userInfo: nil, repeats: true)

    func Start() {
        Guy.addAnimation(thisAnimation, forKey: "thisAnimationKey")
    }

下面是我在执行此问题的建议答案时遇到的错误的图片

额外的论据？？？谢谢，差不多了，哈哈

Answer 1

解决此问题的最简单方法就是删除显式类型注释并让 Swift 为您推断它们:

scene.rootNode.enumerateChildNodesUsingBlock({child, stop in

    // ...

    // to stop the enumeration (as stop is an UnsafeMutablePointer to an ObjCBool)
    stop.memory = true
})

您还可以使用trailing closure syntax让调用看起来更整洁:

scene.rootNode.enumerateChildNodesUsingBlock {child, stop in
    // ...
}