Array of objects that have specific type

Question

I have an array of object, eg

var objects: [AnimalDetailModel] = ...

and also three classes

• AnimalDetailModel is a base class

• DogDetailModel is a class that extends AnimalDetailModel

• CatDetailModel is a class that extends AnimalDetailModel

From a datasource I create and add arrays of DogDetailModels, CatDetailModels and AnimalDetailModels to objects. And when populating the tableView what I want is to get an object form objects and check if it is of type DogDetailModel, CatDetailModel or AnimalDetailModel like

if let objects[indexPath.row] as? DogDetailModel {    
    return DogTableCell    
} else if let objects[indexPath.row] as? CatDetailModel {    
    return CatTableCell     
} else {    
    return AnimalTableCell    
}

While doing this I get type AnimalDetailModel has no subscript members. How do we check the type of objects from array of objects?

Answer 1

You can use the short and simple is attribute.

which in your case will be:

switch objects[indexPath.row] {
    case is DogDetailModel:
        return DogTableCell
    case is CatDetailModel:
        return CatTableCell
    default:
        return AnimalTableCell
}