swift - 打印数组的随机数(Swift)

Question

首先，这是我之前的问题，这样您就知道我想做什么了。

We are trying to make a Small game. We made a sort of monster fighting game. We made items to the game but I want them to drop by the monster. made different types and would like to know how to code to get a Drop Chance on the Items... like

所以现在我知道它是如何工作的，我不得不从我的列表中随机获取一个项目。

所以我真正想要的是在打印时获得“NormalType”列表中的随机项目..

protocol NormalType {
    var name: String { get }
}

class knife: NormalType {
    let name = "Knife"
    let Str = 10
}
class sword: NormalType {
    let name = "Sword"
    let Str = 20
}
class katana: NormalType {
    let name = "Katana"
    let Str = 30
}


class RareType {
    class Knife: RareType {
        var Str = 10
        var Hp = 10
    }
    class sword: RareType {
        var Str = 20
        var HP = 15
    }
    class Katana: RareType {
        var Str = 30
        var Hp = 20
    }
}

class LegendaryType {
    class Knife: LegendaryType {
        var Str = 10
    }
    class sword: LegendaryType {
        var Str = 20
    }
    class Katana: LegendaryType {
        var Str = 30
    }
}
var Knife = knife()
var Sword = sword()
var Katana = katana()

var Items: [NormalType] = [Knife, Sword, Katana]
var randomnumber = (arc4random_uniform(2))

print(Items[randomnumber])

Answer 1

所以你在代码中犯了一个小错误:

您忘记将 : (arc4random_uniform(2))

转换为 Int

import UIKit

protocol NormalType {
    var name: String { get }
}

class knife: NormalType {
    let name = "Knife"
    let Str = 10
}
class sword: NormalType {
    let name = "Sword"
    let Str = 20
}
class katana: NormalType {
    let name = "Katana"
    let Str = 30
}



class RareType {
    class Knife: RareType {
        var Str = 10
        var Hp = 10
    }
    class sword: RareType {
        var Str = 20
        var HP = 15
    }
    class Katana: RareType {
        var Str = 30
        var Hp = 20
    }

}

class LegendaryType {
    class Knife: LegendaryType {
        var Str = 10
    }
    class sword: LegendaryType {
        var Str = 20
    }
    class Katana: LegendaryType {
        var Str = 30
    }

}
var Knife = knife()
var Sword = sword()
var Katana = katana()

var Items: [NormalType] = [Knife, Sword, Katana]
var randomnumber =   Int(arc4random_uniform(2))



print(Items[randomnumber])