如何检测已触摸哪个SKSpriteNode [英] How do I detect which SKSpriteNode has been touched
问题描述
我找到了类似的问题 ，但是我试图检测并确定用户触摸了哪个Sprite，但我不知道该怎么做.这是我的变量:
I find a similar question, but I am trying to detect and identify which Sprite the user touch, and I don't know how to do that. This is my variable:
var sprites: [[SKSpriteNode]] = [[SKSpriteNode(imageNamed: "a"), SKSpriteNode(imageNamed: "b")], [SKSpriteNode(imageNamed: "c"),SKSpriteNode(imageNamed: "d")]]
这个想法是确定spriteNode，然后将其替换为其他sprite或更改颜色，但是我不知道如何使用此spriteNodes矩阵来实现它，我想第一步是确定sprite. /p>
The idea is identify the spriteNode and then replace it for other sprite or change the color, but I don´t know how to do it with this matrix of spriteNodes, I guess the first step it´s identify the sprite.
推荐答案
What you are trying to do (even if I don't see a reason for this) can be accomplished using delegation pattern. Basically, you will tell your delegate (the scene, or whatever you set as a delegate) to do something for you, and you will do that directly from within the button's touchesBegan method. Also, you will pass the button's name to a scene.
要做到这一点，首先必须定义一个名为ButtonDelegate的协议.该协议定义了一个要求，该要求指出任何符合条件的类都必须实现称为printButtonsName(_:):
To make this happen, first you have to define a protocol called ButtonDelegate. That protocol defines a requirement which states that any conforming class has to implement a method called printButtonsName(_:):
protocol ButtonDelegate:class {
func printButtonsName(name:String?)
}
这是将在您的GameScene类中实现的方法，但是是在按钮的touchesBegan中调用的.另外，此方法将用于将按钮的名称传递给其委托(场景)，因此您将始终知道点击了哪个按钮.
This is the method which will be implemented in your GameSceneclass, but called from within button's touchesBegan. Also, this method will be used to pass a button's name to its delegate (scene), so you will always know which button is tapped.
接下来的事情是按钮类本身. Button可能看起来像这样:
Next thing is button class itself. Button might look like this:
class Button : SKSpriteNode{
weak var delegate:ButtonDelegate?
init(name:String){
super.init(texture: nil, color: .purpleColor(), size: CGSize(width: 50, height: 50))
self.name = name
self.userInteractionEnabled = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
delegate?.printButtonsName(self.name)
}
}
这里重要的是userInteractionEnabled = true，这意味着按钮将接受触摸.另一个重要的事情是delegate属性.如前所述，按钮将场景设置为其委托.当我们创建一些按钮时，将场景设置为按钮的代表将在稍后完成...为了使您更轻松，请考虑将代表视为为老板工作的工人:)老板(一个按钮)告诉他的工人(一个场景)为他做点事(打印他的名字).
The important thing here is userInteractionEnabled = true, which means that button will accept touches. Another important thing is a delegate property. As already mentioned, buttons will have the scene set as their delegate. Setting a scene as delegate of buttons will be done later when we create some buttons... To make this easier for you, think of a delegate as a worker who works for his boss :) The boss (a button) tells his worker (a scene) to do something for him (to prints his name).
好的，所以请确保场景符合ButtonDelegate协议...为什么这很重要?这很重要，因为工人(场景)必须遵循老板的命令(按钮).通过遵守此协议，工人正在与老板签定合同，在合同中确认他知道自己的工作方式并将遵守他的命令:)
Okay, so lets make sure that scene conforms to a ButtonDelegate protocol...Why is this important? It is important because the worker (scene) must follow the orders of his boss (a button). By conforming to this protocol, the worker is making a contract with his boss where confirming that he knows how to do his job and will follow his orders :)
class GameScene: SKScene, ButtonDelegate {
override func didMoveToView(view: SKView) {
let play = Button(name:"play")
play.delegate = self
let stop = Button(name:"stop")
stop.delegate = self
play.position = CGPoint(x: frame.midX - 50.0, y: frame.midY)
stop.position = CGPoint(x: frame.midX + 50.0, y: frame.midY)
addChild(play)
addChild(stop)
}
func printButtonsName(name: String?) {
if let buttonName = name {
print("Pressed button : \(buttonName) ")
}
//Use switch here to take appropriate actions based on button's name (if you like)
}
}
就是这样.当您点击播放按钮时，按钮本身上的touchesBegan将被调用，然后该按钮将告诉其委托使用场景类内部定义的方法打印其名称.
And that's it. When you tap the play button, the touchesBegan on a button itself will be called, then the button will tell its delegate to print its name using the method defined inside of scene class.
这篇关于如何检测已触摸哪个SKSpriteNode的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
