ios - 试图从类中获取值的下标错误

Question

我正在尝试将一个类中的所有值加在一起。这是我的代码:

 var allPlayersArray: [allPlayersIngame] = []

class allPlayersIngame {
        let username: String
        let uid: String
        var score: Int

        init(username: String, uid: String, score: Int) {
            self.username = username
            self.uid = uid
            self.score = score
        }
    }

var totalScore = 0
    for playerScore in self.allPlayersArray{
    if let score = self.allPlayersArray[playerScore].score{
    }//error
     totalScore += allPlayersArray[playerScore].score
    }//error
    self.averageScore = totalScore / self.allPlayersArray.count
}

错误如下:

Cannot subscript a value of type '[vc.allPlayersIngame]' with an index of type 'vc.allPlayersIngame'

我的方法是遍历每个数组元素并获得它们的分数。好吧，结果并不理想。

Answer 1

您混淆了基于 index 和基于 item 的 for 循环

它是(索引基于)

for index in 0..<self.allPlayersArray.count {
     totalScore += allPlayersArray[index].score
}
self.averageScore = totalScore / self.allPlayersArray.count

或(基于项目)

for playerScore in self.allPlayersArray {
     totalScore += playerScore.score
}
self.averageScore = totalScore / self.allPlayersArray.count

---

或(无循环)

let totalScore = self.allPlayersArray.map({ $0.score }).reduce(0, { $0 + $1 })