Xcode:我的健康条颜色的快速可选

Question

我在 swift 的 Xcode 中为我的游戏创建了一个生命条。我在warrior1中添加了生命条。但是如果healthBar.progress达到value <= 0.5 && progressBar.progress >= 0.2，我想将生命条的颜色更改为黄色，如果healthBar.progress < 0.2到目前为止，这是我的代码：

var warrior1 = Swordsman(position: CGPoint(x: 20, y: 100))
self.addChild(warrior1)
allUnits.append(warrior1)

var progressBar = ProgressBar(color: SKColor.green, size:CGSize(width:100, height:10))
// progressBar.position = warrior1.position
progressBar.position = CGPoint( x: 3, y: 55)
progressBar.progress = 0.5 // if I change the value, the color has to change too
if (progressBar.progress <= 0.5 && progressBar.progress >= 0.2){
// WHAT SHOULD I WRITE HERE?
}
else if ( progressBar.progress < 0.2){
// AND HERE?
}
warrior1.addChild(progressBar)

这就是我ProgressBar课：

import Foundation
import SpriteKit
class ProgressBar:SKNode {
var background:SKSpriteNode?
var bar:SKSpriteNode?
var _progress:CGFloat = 0
var progress:CGFloat {
get {
return _progress
}
set {
let value = max(min(newValue,1.0),0.0)
if let bar = bar {
bar.xScale = value
_progress = value
}
}
}
convenience init(color:SKColor, size:CGSize) {
self.init()
background = SKSpriteNode(color:SKColor.black,size:size)
bar = SKSpriteNode(color:color,size:size)
if let bar = bar, let background = background {
bar.xScale = 0.0
bar.zPosition = 1.0
bar.position = CGPoint(x:-size.width/2,y:0)
bar.anchorPoint = CGPoint(x:0.0,y:0.5)
addChild(background)
addChild(bar)
}
}
}

有谁知道我必须在 if 和 else 括号中编写什么代码？ 我将不胜感激得到答复。

Answer 1

有很多方法可以做到这一点，但这可能是其中之一：

var progress: CGFloat {
get {
return _progress
}
set {
let value = max(min(newValue,1.0),0.0)
if let bar = bar {
bar.xScale = value
_progress = value
// Set the color
if value <= 0.2 {
bar.color = .red
} else if // Continue on your own
}
}
}