从数组中删除模型对象

Question

在 collectionView 中选择时在数组中添加模型对象，现在需要从数组中删除取消选择的项目。但是 where 子句不起作用，因为它是在数组中添加的模型，而不是任何正常的数据类型。请指导。以下是我的代码：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    if selectedIndex.contains(indexPath.row) {
        selectedIndex.removeAll(where: { $0 == indexPath.row })
      
        if(userCategories.count > 0){
           
            userCategories.removeAll(where: { $0 == self.categoriesList[indexPath.row] }) // Error in this line
            print(userCategories)
        }
    }else {
        selectedIndex.append(indexPath.row)

        userCategories.append(self.categoriesList[indexPath.row])
        print(userCategories)
    }
}

错误是：

Binary operator '==' cannot be applied to two 'CategoriesData' operands

模型类：

class CategoriesData: Codable {
var id: Int?
var name: String?
var status: String?
}

Answer 1

要比较 2 个自定义对象，您需要实现 Equatable

class CategoriesData: Codable , Equatable {
    var id: Int?
    var name: String?
    var status: String?
    static func == (lhs: CategoriesData, rhs: CategoriesData) -> Bool {
        lhs.id == rhs.id
    }
}

或

userCategories.removeAll(where: { $0.id == self.categoriesList[indexPath.row].id })