From [String: Any] to "Key = Value" String in Swift

Question

I have a struct which consist of some elements which are in String, Bool and Int lets call it Struct A. I also have an another struct lets called it Struct B.

Struct A{
let name: String
let surname: String
let age: Int   
}

Struct B{
let columnId: Int
let value: String
}

I have an array of B and I want to assign values of A to B. Example array;

FirstElement(columnId:1,value:"name=myname") SecondElement(columnId:2,value:"surname=mysurname") ThirdElement(columnId:3,value:"age=20")

I can get all properties of a struct with below extension;

extension Loopable {
func allProperties() throws -> [String: Any] {

    var result: [String: Any] = [:]

    let mirror = Mirror(reflecting: self)

    // Optional check to make sure we're iterating over a struct or class
    guard let style = mirror.displayStyle, style == .struct || style == .class else {
        throw NSError()
    }

    for (property, value) in mirror.children {
        guard let property = property else {
            continue
        }

        result[property] = value
    }

    return result
}
}

After I get the all properties I want some kind of iteration; My question is that how can I get value and key like "value=key" string in below "classA[i]"

 func setArray(){
 let classA = classA().getAllProperties()
    for i in 0..<deviceLogs.count{
        myArray.append(B(columnId: i, value: classA[i]) )
    }
}

EDIT: I want to get all the properties with its values inside Struct A and use it as String for value property when creating Struct B object.

classA["name"] is not working?

Retterdesdialogs
– Retterdesdialogs

2018-11-27 14:33:43 +00:00
Commented Nov 27, 2018 at 14:33 — Retterdesdialogs
– Retterdesdialogs, Commented Nov 27, 2018 at 14:33
If you have to use Mirror, you are doing something wrong.

Sulthan
– Sulthan

2018-11-27 15:37:39 +00:00
Commented Nov 27, 2018 at 15:37 — Sulthan
– Sulthan, Commented Nov 27, 2018 at 15:37

Nilanshu Jaiswal · Accepted Answer · 2018-11-28 04:36:52Z

1

Modify your setArray function

func setArray(){
    let keysArray = Array(classA.keys)
    let valuesArray = Array(classA.values)

    let classA = classA().getAllProperties()
    for i in 0..<deviceLogs.count{
        let valueString = keysArray[i] + "=" + valuesArray[i]
        myArray.append(B(columnId: i, value: valueString) )
    }
}

edited Nov 28, 2018 at 4:36

answered Nov 27, 2018 at 14:39

Nilanshu Jaiswal

1,7334 gold badges26 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Emre Önder Over a year ago

Works like a charm. I have only one question. Can we be sure that keysArray and valuesArray will be same in all situations. I mean first value of keys array equals to values arrays first key?

Nilanshu Jaiswal Over a year ago

By definition, a dictionary has no order. So I would recommend you to eventually improve your data structure instead of using a dictionary. In your allProperties function, you are creating a dictionary called result.

Emre Önder Over a year ago

Aaa ok sorry. Actually, I guess, this is not a bad approach. I'm just not sure If both arrays' has same order every time.

Satish · Accepted Answer · 2018-11-27 14:57:18Z

1

Check out this

struct B {
    let columnId: Int
    let value: Any
}

protocol Properties {
    var allProperties: [Any] { get }
}

extension Properties {
    var allProperties: [Any] {
        return Mirror(reflecting: self).children.flatMap { $0 }
    }
}    

struct A: Properties {
    let name: String
    let surname: String
    let age: Int
}

Here is the example how you can use it:

let properties = A(name: "name", surname: "surname", age: 18).allProperties

// NOTE: your value property in B should be of type Any in place of String

var list = [B]()
for (index, property) in properties.enumerated() {
    list.append(B(columnId: index, value: property))
}

edited Nov 27, 2018 at 14:57

answered Nov 27, 2018 at 14:34

Satish

2,0731 gold badge14 silver badges22 bronze badges

Collectives™ on Stack Overflow

From [String: Any] to "Key = Value" String in Swift

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related