[View Model with data object interacting with]

viewModelWithData.swift

struct DataObject {
    var title: String?
    var publishDate: Date
    var imageUrl: String?
    
    // other properties
    var expirationDate : Date
    var documentHTML: String?
}

protocol MyViewModel {
    var title: String? { get }
    var date: String? { get }
    var hasPhotos: Bool { get }
}

class MyViewModelDefault {
    let dataObject: DataObject
    
    init(with dataObject: DataObject) {
        self.dataObject = dataObject
    }
}

extension MyViewModelDefault: MyViewModel {
    var title: String? {
        return self.dataObject.title
    }
    
    var date: String? {
        let dateformatter = DateFormatter()
        dateformatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        return dateformatter.string(from: self.dataObject.publishDate)
    }
    
    var hasPhotos: Bool {
        return self.dataObject.imageUrl != nil
    }
    
}