如何计算精灵数量 [英] how to count number of sprites swift

问题描述

我正在构建一个将精灵添加到屏幕的应用程序.在代码的几个部分中，我想知道某个键有多少个精灵.目前，我以这种方式实现了

I'm building an app that add sprites to the screen. In several parts of my code I want to know how many sprites I have with a certain key. At the moment I implemented it in this way

var counter = 0
enumerateChildNodesWithName("box") { node, _ in
  counter = counter + 1
}
println(counter)

还有另一种更简单，更短的方法吗?谢谢

Is there another easier and shorter way? Thanks

推荐答案

在iOS8 中， SKNode 具有 subscript 成员，用于查询节点并返回 Array< SKNode> .

From iOS8, SKNode has subscript member that queries nodes and returns Array<SKNode>.

extension SKNode {
    subscript (name: String) -> [SKNode] { get }
}

因此您可以:

let count = self["box"].count
println(count)

代替:

var counter = 0
self.enumerateChildNodesWithName("box") { _, _ in
    counter += 1
}
println(counter)

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