How to list all Variables of a class in swift - class

Question

Is there a way to list all Variables of a class in Swift?
For example:
class foo {
var a:Int? = 1
var b:String? = "John"
}
I want to list it like this: [a:1, b:"John"]

Answer 1

How you can do it in Swift 3.0 recursively:
import Foundation
class FirstClass {
var name = ""
var last_name = ""
var age = 0
var other = "abc"
func listPropertiesWithValues(reflect: Mirror? = nil) {
let mirror = reflect ?? Mirror(reflecting: self)
if mirror.superclassMirror != nil {
self.listPropertiesWithValues(reflect: mirror.superclassMirror)
}
for (index, attr) in mirror.children.enumerated() {
if let property_name = attr.label {
//You can represent the results however you want here!!!
print("\(mirror.description) \(index): \(property_name) = \(attr.value)")
}
}
}
}
class SecondClass: FirstClass {
var yetAnother = "YetAnother"
}
var second = SecondClass()
second.name = "Name"
second.last_name = "Last Name"
second.age = 20
second.listPropertiesWithValues()
results:
Mirror for FirstClass 0: name = Name
Mirror for FirstClass 1: last_name = Last Name
Mirror for FirstClass 2: age = 20
Mirror for FirstClass 3: other = abc
Mirror for SecondClass 0: yetAnother = YetAnother

Answer 2

The following should use reflection to generate the list of members and values. See fiddle at http://swiftstub.com/836291913/
class foo {
var a:Int? = 1
var b:String? = "John"
}
let obj = foo()
let reflected = reflect(obj)
var members = [String: String]()
for index in 0..<reflected.count {
members[reflected[index].0] = reflected[index].1.summary
}
println(members)
Output:
[b: John, a: 1]

Answer 3

Maybe a bit late for the party, but this solution using reflection and Mirror is 100% working:
class YourClass : NSObject {
var title:String
var url:String
...something other...
func properties() -> [[String: Any]] {
let mirror = Mirror(reflecting: self)
var retValue = [[String:Any]]()
for (_, attr) in mirror.children.enumerated() {
if let property_name = attr.label as String! {
retValue.append([property_name:attr.value])
}
}
return retValue
}
}
and somewhere in your code...
var example = MoreRow(json: ["title":"aTitle","url":"anURL"])
print(example.listPropertiesWithValues())

Answer 4

I got clue from here. https://medium.com/#YogevSitton/use-auto-describing-objects-with-customstringconvertible-49528b55f446
This is a demo above Swift 4.0.
import Foundation
extension CustomStringConvertible {
var description : String {
var description: String = ""
if self is AnyObject { // unsafeAddressOf((self as! AnyObject))
description = "***** \(type(of: self)) - <\(Unmanaged.passUnretained(self as AnyObject).toOpaque())>***** \n"
} else {
description = "***** \(type(of: self)) *****\n"
}
let selfMirror = Mirror(reflecting: self)
for child in selfMirror.children {
if let propertyName = child.label {
description += "\(propertyName): \(child.value)\n"
}
}
return description
}
}
extension NSObject {
var description: String {
var description: String = ""
if self is AnyObject { // unsafeAddressOf((self as! AnyObject))
description = "***** \(type(of: self)) - <\(Unmanaged.passUnretained(self as AnyObject).toOpaque())>***** \n"
} else {
description = "***** \(type(of: self)) *****\n"
}
let selfMirror = Mirror(reflecting: self)
for child in selfMirror.children {
if let propertyName = child.label {
description += "\(propertyName): \(child.value)\n"
}
}
return description
}
}
class AA: CustomStringConvertible {
var a: String = "aaa"
}
class BB: NSObject {
var b: String = "bbb"
}
let aa = AA()
print(aa)
let bb = BB()
print(bb.description)
Output --
***** AA - <0x00000001001038e0>*****
a: aaa
***** BB - <0x0000000100103310>*****
b: bbb