class A {
var x = 1
}
var a = A()
How to get a variable "x" from object "a" using string name ( a["x"] )?
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2 Answers
This will work if the class inherits from NSObject, where you can use valueForKey: to get at the properties.
import Foundation
class A: NSObject {
var x = 1
}
let a = A()
let aval = a.valueForKey("x")
println("\(aval)")
Note that aval is an AnyObject? here since there's no type information. You'll need to cast it or test what it is yourself.
Comments
Expanding on gregheo's answer, if you want to use the subscript syntax like the example in your question, you can do so by implementing subscript.
class A: NSObject {
var x = 1
subscript(key: String) -> Int {
get {
return self.valueForKey(key) as Int
}
set {
self.setValue(newValue, forKey: key)
}
}
}
var a = A()
println(a["x"])
a["x"] = 5
println(a["x"])
