Arrays 如何使用实例变量访问另一个变量中的对象并返回

如何使用实例变量访问另一个变量中的对象并返回

class Tyre {
    let name: String
    var owner: Vehicle?
    init(name: String){
        self.name = name
    }
}

class Vehicle {
    var name: String
    var tyres: [Tyre] = []

    var stringIds = "";
    var tyreNames : () -> String = {
        //        let allTyres = (tyres.map{String($0)}).joined(separator: ",")
        print(tyres) // unable to acess tyres here
        return ""
   }

    init(name: String){
        self.name = name
    }

    func adopt(tyre: Tyre){
        tyres.append(tyre)
        tyre.owner = self
    }
}

var myCar = Vehicle(name: "Honda")
var tyre = Tyre(name: "MRF")
myCar.adopt(tyre: tyre)
tyre = Tyre(name: "CFP")
myCar.adopt(tyre: tyre)
print(myCar.tyreNames())

无法访问车辆类别中的轮胎以打印车辆类别中具有以下特征的所有轮胎：

错误：实例成员“轮胎”不能用于类型“车辆”

---

而不是作为闭包声明

tyreNames

作为计算变量

var tyreNames : String {
    return tyres.map{ $0.name }.joined(separator: ", ")
}

叫它

print(myCar.tyreNames)