ios - 生成随机颜色并将其分配给对象

Question

我想让Obstacle_Color = random 颜色而不是blackcolor。我找到了随机颜色实现，但无法将 `Obstacle_Color 与 rand 方法的返回值合并。提前致谢!

import Foundation
import SpriteKit

class AKObstacle: SKSpriteNode {

    let Obstacle_Width: CGFloat = 40.0
    let Obstacle_Height: CGFloat = 70.0
    let Obstacle_Color = UIColor.blackColor()

    init(){

        let size = CGSizeMake(Obstacle_Width, Obstacle_Height)
        super.init(texture: nil, color: Obstacle_Color, size: size)

        loadPhysicsBoadyWithSize(size)
        startMoving()

    }

---

func getRandomColor() -> UIColor{

    var randomRed:CGFloat = CGFloat(drand48())

    var randomGreen:CGFloat = CGFloat(drand48())

    var randomBlue:CGFloat = CGFloat(drand48())

    return UIColor(red: randomRed, green: randomGreen, blue: randomBlue, alpha: 1.0)

}

Answer 1

一个解决方案是让 get randomcolor 成为一个静态函数，并将其作为类方法调用。另一个方法(可能更好，因为该函数似乎并没有专门链接到该类)是使它成为一个公共(public)方法。还有人建议在构造函数中调用它，这也有效。

方案一

import UIKit
import Foundation
import SpriteKit

class AKObstacle: SKSpriteNode {

    let Obstacle_Width: CGFloat = 40.0
    let Obstacle_Height: CGFloat = 70.0
    let Obstacle_Color = AKObstacle.getRandomColor()

    init() { ... }

    static func getRandomColor() -> UIColor {

        var randomRed:CGFloat = CGFloat(drand48())

        var randomGreen:CGFloat = CGFloat(drand48())

        var randomBlue:CGFloat = CGFloat(drand48())

        return UIColor(red: randomRed, green: randomGreen, blue: randomBlue, alpha: 1.0)
    }
}

解决方案2

import UIKit
import Foundation
import SpriteKit

class AKObstacle: SKSpriteNode {

    let Obstacle_Width: CGFloat = 40.0
    let Obstacle_Height: CGFloat = 70.0
    let Obstacle_Color = getRandomColor()

    init() {...}

}

public func getRandomColor() -> UIColor {

    var randomRed:CGFloat = CGFloat(drand48())

    var randomGreen:CGFloat = CGFloat(drand48())

    var randomBlue:CGFloat = CGFloat(drand48())

    return UIColor(red: randomRed, green: randomGreen, blue: randomBlue, alpha: 1.0)
}