Question

相关代码：

导入SpriteKit

类GameScene：SKScene {

//1
let warrior = SKSpriteNode(imageNamed: "warr")

var healthBoss = SKLabelNode(text: "Boss HP: 25")

override func didMove(to view: SKView){
    gameScene = self
    //2
    setupLayers()


    spawnWarr(at: warriorposition)
    spawnBoss(at: bossposition)

    setupLabels()

    backgroundColor = SKColor.blue




}


func setupLayers() {
    objectsLayer = SKNode()
    objectsLayer.name = "Objects Layer"
    addChild(objectsLayer)
}


func spawnWarr(at: CGPoint) {

    let newWarr = warriorclass()
    newWarr.position = at
    self.addChild(newWarr)

}

func spawnBoss(at: CGPoint) {

    let newBoss = bossclass()
    newBoss.position = at
    self.addChild(newBoss)

}

func setupLabels() {

    healthBoss.position = CGPoint(x: size.width * 0.5, y: size.height * 0.1)
    healthBoss.fontColor = whiteColor
    healthBoss.fontName = "Copperplate"
    healthBoss.text = "Boss HP: \(spawnedBoss.health)"

\具体在这里使用（spawnedBoss.health）是我得到的地方“exc_bad_instruction（code = exc_i386_invop subcode = 0x0）”

    healthBoss.fontSize = 22
    healthBoss.zPosition = layers.uistuff
    objectsLayer.addChild(healthBoss)

}

bossclass.swift文件 -

导入UIKit 导入SpriteKit

class bossclass：character，pTargetable {

var health = 25
var maxhealth = 25

override init() {


    super.init()

    scorePoints = 5

    let texture = texturesBoss
    let xSize = texture.size().width*bossscale
    let ySize = texture.size().height*bossscale
    let size = CGSize(width: xSize, height: ySize)

    self.name = "boss"

    let top = SKSpriteNode (texture: texture, size: size)
    top.zPosition = layers.raiders
    top.color = SKColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
    top.colorBlendFactor = 1.0

    self.addChild(top)

}


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

func takeDamage(damage: Int) {
    health -= damage
    print("You lost \(damage) hit points")

    if health <= 0 {
        die()
        print("You are dead now")
    }
}

}

global.swift文件包括： var spawnedBoss：bossclass！

和协议：

协议pTargetable {

var health: Int { get set }
func takeDamage(damage: Int)

}

所以我能看到的问题是没有问题。我想也许在我催生老板之前我引用了老板的健康状况，但看着代码看起来并不是那样。也许有一个更容易的解决方案，让老板健康栏更新损坏？

任何帮助将不胜感激。谢谢。

Answer 1

当你写道：

var spawnedBoss: bossclass!

你向Swift承诺，如果它是零并且它不应该强迫你检查，你永远不会尝试使用spawnedBoss。

然后你写道：

healthBoss.text = "Boss HP: \(spawnedBoss.health)"

此时spawnedBoss可能是零。

所以，我会改变：

var spawnedBoss: bossclass!

到

var spawnedBoss: bossclass?

然后添加所有正确的nil检查以清除您将获得的编译器错误。当你清除它们时（不是用！，而是使用if let或??），那么你可以确定只有当它不是零时才使用spawnedBoss。

试图更新文本（特别是游戏中老板的健康状况）并获取“exc_bad_instruction（code = exc_i386_invop subcode = 0x0）”

1 个答案: