Swift对数组中具有相同属性的四个不同类型的对象（AnyObject）进行排序

Question

class ComparedObject {
    let id: String
    let order: Int
    ...
}

class Object1 {
    let id: String
    let name: String
    ...
}

class Object2 {
    let id: String
    let x: Float
    ...
}

class Object3 {
    let id: String
    let y: Int
    ...
}

class Object4 {
    let id: String
    let z: Double
    ...
}

var comparedList: [ComparedObject] = [ComparedObject, ComparedObject, ComparedObject, ComparedObject]

var list = [AnyObject] = [Object2, Object1, Object3, Object4]

我有四个类，都有 id: String 属性。

我想将它们存储到一个 (AnyObject) 数组中以显示在 UICollectionView 中。

那么如何使用 compareList id 属性对列表数组进行排序？

comparedList 已经排序。

我想要从比较列表 id 属性中排序列表数组：

var comparedList = [
    ComparedObject(id: "01d7da417657", order: 0),
    ComparedObject(id: "61a96d769843", order: 1),
    ComparedObject(id: "5047abd36432", order: 2),
    ComparedObject(id: "3213f37a4003", order: 3)
]

var list = [
    Object2(id: "3213f37a4003", x: 34.0),
    Object1(id: "61a96d769843", name: "name"),
    Object3(id: "01d7da417657", y: 9),
    Object4(id: "5047abd36432", z: 0.3)
]

到这里：

var list = [
    Object3(id: "01d7da417657", y: 9),
    Object1(id: "61a96d769843", name: "name"),
    Object4(id: "5047abd36432", z: 0.3),
    Object2(id: "3213f37a4003", x: 34.0)
]

最后我这样做了：

comparedList = comparedList.sorted { $0.order < $1.order }
var comparedOrder = comparedList.map { $0.id }

list.sort { (comparedOrder.firstIndex(of: $0.id)! < comparedOrder.firstIndex(of: $1.id)! }

Answer 1

您只需要创建一个protocol 来定义id: String 属性的要求，然后使您的所有类型都符合所述协议，而不是将它们存储为AnyObject，而是将它们存储为协议类型。这将使您能够根据id 对数组进行排序。

protocol MyIdentifiable {
    var id: String { get }
}

struct ComparedObject: MyIdentifiable {
    let id: String
}

struct Object1: MyIdentifiable {
    let id: String
    let name: String
}

struct Object2: MyIdentifiable {
    let id: String
    let x: Float
}

struct Object3: MyIdentifiable {
    let id: String
    let y: Int
}

struct Object4: MyIdentifiable {
    let id: String
    let z: Double
}

let comparedList = [ComparedObject(id: "!")]
let list: [MyIdentifiable] = [Object1(id: "1", name: "1"), Object2(id: "2", x: 2.0)]
let sortedList = list.sorted(by: { $0.id < $1.id })