数组Swift中的唯一对象 [英] Unique Objects inside a Array Swift

问题描述

我有一个带有自定义对象的数组。

I have an array, with custom objects.

我想用重复的属性弹出重复的对象：

I Would like to pop the repeated objects, with the repeated properties:

let product = Product()
product.subCategory = "one"

let product2 = Product()
product2.subCategory = "two"

let product3 = Product()
product3.subCategory = "two"

let array = [product,product2,product3]

在这种情况下，弹出 product2或product3

推荐答案

您可以使用Swift 设置：

You can use Swift Set:

let array = [product,product2,product3]

let set = Set(array)

你必须使产品符合 Hashable （因此， Equatable ）虽然：

You have to make Product conform to Hashable (and thus, Equatable) though:

class Product : Hashable {
    var subCategory = ""

    var hashValue: Int { return subCategory.hashValue }
}

func ==(lhs: Product, rhs: Product) -> Bool {
    return lhs.subCategory == rhs.subCategory
}

，如果 Product 是 NSObject 子类，则必须覆盖 isEqual ：

And, if Product was a NSObject subclass, you have to override isEqual:

override func isEqual(object: AnyObject?) -> Bool {
    if let product = object as? Product {
        return product == self
    } else {
        return false
    }
}

显然，修改它们以反映您班级中可能包含的其他属性。例如：

Clearly, modify those to reflect other properties you might have in your class. For example:

class Product : Hashable {
    var category = ""
    var subCategory = ""

    var hashValue: Int { return [category, subCategory].hashValue }
}

func ==(lhs: Product, rhs: Product) -> Bool {
    return lhs.category == rhs.category && lhs.subCategory == rhs.subCategory
}

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