碰撞检查问题

问题描述

该代码检查用户是否轻拍了与随机改变纹理的球具有相同纹理的球.但是在我的控制台中，尽管我轻点与随机改变纹理的球具有相同纹理的球，但点"仅偶尔打印.如何解决这个问题.这与向其他球添加PhysicalBody有关吗?

The code checks if the user taps a ball with the same texture as a ball that randomly changes textures. But in my console "Point" is only printed occasionally although I tap on the ball with the same texture as the ball that randomly changes texture. How can this be fixed. Has this something to do with adding a physicsBody to the other balls?

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

    var array = [blueTexture, redTexture, greenTexture, yellowTexture]// var with value of textures

    var blackB = childNodeWithName("changeBall") as! SKSpriteNode

    let randomIndex = Int(arc4random_uniform(UInt32(array.count)))
    blackB.texture = array[randomIndex] // blackB is given a random texture 

    for t in touches { // check each touch

        let touch = t as! UITouch
        let pos = touch.locationInNode(self) // find touch position

        for child in self.children { // check each children in scene
            if let ball = child as? SKSpriteNode{ 
                if ball !== blackB && ball.containsPoint(pos) { // check for collision, but skip if it's a blackB
                    if ball.texture == blackB.texture { // collision found, check color
                        println("POINT")
                    }
                }
            }
        }
    }


}

推荐答案

一些观察结果...

1. nodeAtPoint(pos)可以替换子节点上的for循环
不需要
2. ball.containsPoint(pos)，因为nodeAtPoint执行相同的测试
3. ball !== blackB应该是ball != blackB
4. 也许在检查纹理匹配后更改为随机纹理更有意义

1. nodeAtPoint(pos) can replace the for loop over child nodes
2. ball.containsPoint(pos) is not needed because nodeAtPoint performs the same test
3. ball !== blackB should be ball != blackB
4. Perhaps changing to a random texture after checking for a texture match makes more sense

具有上述更改的实现

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

    var array = [blueTexture, redTexture, greenTexture, yellowTexture]
    var blackB = childNodeWithName("changeBall") as! SKSpriteNode

    if let touch = touches.first as? UITouch {
        let pos = touch.locationInNode(self)
        if let ball = nodeAtPoint(pos) as? SKSpriteNode {
            if ball != blackB && ball.texture == blackB.texture {
                println("POINT")
            }
        }
    }
    // Change texture after checking for a texture match
    let randomIndex = Int(arc4random_uniform(UInt32(array.count)))
    blackB.texture = array[randomIndex]
}

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