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为什么不能在其init函数中设置SKSprite的名称?

skspritenode initialization sprite-kit swift

Jurik Arko Elsenaar · 技术社区 · 9 年前

我已经扩展了SKSpriteNode,并希望在其init函数中设置其name属性:

class Ship: SKSpriteNode {


    var id: Int

    /**
     *  Image name of sprite image for this bubble.
     **/
    var image: String

    //some other vars but NOT name, because its super class SKNode has already name

    init(ship: (name: String, <other vars>), position: CGPoint) {

        let texture = SKTexture(imageNamed: self.image)
        super.init(texture: texture, color: UIColor.clearColor(), size: texture.size())
        self.name = name //here I set its name!!!
        self.position = position

        self.physicsBody = SKPhysicsBody(circleOfRadius: self.size.width / 2)
        self.physicsBody!.dynamic = true
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

但后来,当我使用创建“Ship”时(Ship[1]是包括name在内的一些值):

var titanic = Ship(ship: ship[1], position: shipPosition!)
println(titanic.name) //nil
self.addChild(titanic)
titanic.name = 'titanic'
println(titanic.name) //titanic

正如您所看到的,name不是在初始化时设置的,我必须在创建后设置它。

如何在其init方法中设置此名称?或者我必须在它创建之后才命名它?

2 回复 | 直到 9 年前

jtbandes 9 年前

在此背景下, self.name = name 实际上意思与 self.name = self.name .

您试图在 tuple ,所以你可能想要 self.name = ship.name 。(甚至 name = ship.name .)

或者,您可以将这些作为参数直接传递给初始值设定项:

init(named name: String, <other vars>, position: CGPoint) {
    // ...
    self.name = name
}

Ship(named: "titanic", <other vars>, position: shipPosition!)