CODEWITHSUNDEEP
swift
nwales
nwales

Reputation: 3561

how can I create a reference to a property dynamically in Swift

How could I accomplish this in swift.

let thing1 = whatever //instance property on class

let index = 1
var myThing = self["thing\(index)"] //does not work

Upvotes: 0

Views: 679

Answers (1)

qwerty_so
qwerty_so

Reputation: 36305

If your class complies to NSObject you can use this:

class Obj : NSObject {
  var a1 = "Hi"
}

let obj = Obj()
let ctr = 1
println (obj.valueForKey("a\(ctr)"))

To list the available properties you can use the following (from another SO question):

var count : UInt32 = 0
let classToInspect = Obj.self
let properties : UnsafeMutablePointer <objc_property_t> = class_copyPropertyList(classToInspect, &count)
var propertyNames : [String] = []
let intCount = Int(count)
for var i = 0; i < intCount; i++ {
  let property : objc_property_t = properties[i]
  let propertyName = NSString(UTF8String: property_getName(property))!
  propertyNames.append(propertyName)
}
free(properties)
println(propertyNames)

Upvotes: 1

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