在直线的SKShapeNode上检测触摸 [英] Detecting Touch on SKShapeNode that is a Line
问题描述
我创建了一个SKShapeNode并为其指定了CGPath.这是在我的GameScene.swift中的didMoveToView中:
I have an SKShapeNode that I have created and given a CGPath to. This is in my GameScene.swift in didMoveToView:
let myNode = SKShapeNode()
let lineToDraw = CGPathCreateMutable()
CGPathMoveToPoint(lineToDraw, nil, 0, 0)
CGPathAddLineToPoint(lineToDraw, nil, 87, 120)
myNode.path = lineToDraw
myNode.strokeColor = SKColor.redColor()
myNode.lineWidth = 20
myNode.name = "My Node!"
world.addChild(myNode) // World is a higher-level node in my scene
这又是我在场景中检测触摸的方式:
And this is how I'm detecting touches, again in the Scene:
override func touchesEnded(touches: NSSet!, withEvent event: UIEvent!) {
if let touch = touches.anyObject() as? UITouch {
if let shapeNode = nodeAtPoint(touch.locationInNode(self)) as? SKShapeNode {
println("Touched \(shapeNode.name)")
} else {
println("Nothing here")
}
}
}
该行节点显示没有问题.但是，它根本没有注册touchesEnded.
The line node is showing up with no issues. However, it is not registering touchesEnded at all.
真的，我有三个疑问与此无关:
Really, I have three questions nebulous to this:
-
是否有更好的方法来创建在两点之间的直线的SKShapeNode而不调用便捷初始化器?我计划对SKShapeNode进行子类化，以向该节点添加其他逻辑，并且该子类无权访问超类的便捷初始化程序.
Is there a better way to create an SKShapeNode that is a line between two points without calling a convenience initializer? I plan on subclassing SKShapeNode to add additional logic to the node, and the subclass doesn't have access to convenience initializers of the superclass.
更重要的是，如何让场景识别那里的线节点并触发touchesEnded?
More importantly, how do I get the scene to recognize my line node there and trigger touchesEnded?
有没有办法使用这种机制，使它更加模糊"，因此它可以处理靠近线条而不是线条的触摸?我最终的计划是使其更薄，但我仍然希望有一个较大的触摸区.我知道如果没有别的，我可以创建两个节点:一个透明/厚节点，另一个红色/薄节点，并在透明节点上处理触摸事件，但是我想知道是否有更好的方法.
Is there a way, using that mechanism, I can make it a bit more "fuzzy", so it handles touches close to the line, instead of on the line? My eventual plan is to make it thinner, but I'd still like to have a large touch zone. I figure if nothing else, I can create two nodes: one clear/thick and the other red/thin, and handle touch events on the clear one, but I would like to know if there's a better way.
推荐答案
在回答您的主要问题时，touchesEnded方法存在问题. apple显示的模板建议以下布局:
In answer to your main question, there is a problem in your touchesEnded method. The template shown by apple recommends the following layout:
override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
}
}
然后您可以使用此方法查看location值是否在行框架内(为此，我在didMoveToView外部创建了"myNode"变量，以便可以从其余部分访问它功能):
You can then use this method to see if the location value is inside the lines frame (in order to do this, i created the "myNode" variable outside of the didMoveToView so that i could access it from the rest of the functions):
override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
for touch: AnyObject in touches {
let location = touch.locationInNode(world)
if CGRectContainsPoint(myNode.frame, location) {
println("Touched \(myNode.name)")
} else {
println("Nothing here")
}
}
}
对于模糊"行，您可以简单地检查较大的CGRect.在上面的代码中，我检查了myNode.frame，但是您可以创建一个CGRect变量，该变量比该行稍大，以便您可以检测到没有直接击中它的触摸.
As for a "fuzzier" line, you can simply check a larger CGRect. In the code above, i check myNode.frame but you could create a variable with a CGRect which is slightly larger than the line so that you can detect touches which don't directly hit it.
对于更简洁的代码，我目前无法想到任何东西，但这并不是说没有办法.但是，我不太了解您对子类无法访问便捷方法的含义，因为只要您正确导入，子类就可以访问超类所做的任何事情.
As for more concise code, i cannot think of any at the moment but that isn't to say that there isn't a way. However, I don't quite understand what you mean about subclasses not having access to convenience methods as they can have access to whatever the superclass does so long as you import correctly.
我希望这会有所帮助.
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