Variable name in dot notation in Swift

December 14, 2022

I want to use variable names in dot notation in Swift.

I’m wrestling with trying to make sense of JSON in Swift, and having a really hard time doing things that are so easy in JS (like cycling through objects, etc).

I have variables of custom types:

var questionConfiguration: QuestionConfiguration
var priorityConfiguration: PriorityConfiguration

Each of these types has an attribute, displayOrder, I want to access this dynamically. I have tried various things, including the following (i is a variable of type Int):

var configs = [self.questionConfiguration, self.priorityConfiguration]
print([configs[i]].displayOrder)

var configs = ["questionConfiguration", "priorityConfiguration"]
print([configs[i]].displayOrder)

How can I achieve this?

EDIT:

struct QuestionConfiguration: Codable {
    var displayOrder: Int
}

struct PriorityConfiguration: Codable {
    var displayOrder: Int
}

>Solution :

You can create a protocol for same property name then you can access it easily

protocol SameProp {
    var displayOrder: Int {get set}
}

class QuestionConfiguration : SameProp {
     var displayOrder : Int = 4
}

class PriorityConfiguration : SameProp {
     var displayOrder : Int = 6
 }

var questionConfiguration: QuestionConfiguration = QuestionConfiguration()
var priorityConfiguration: PriorityConfiguration = PriorityConfiguration()

var configs = [questionConfiguration, priorityConfiguration] as [SameProp]
for elements in configs{
    print(elements.displayOrder) // will print 4 and 6
}