Change value of dictionary within array in Swift 2

Question

I'm trying to change a value of a dictionary that is within an array. I made a small prototype in PlayGround:

var arr = [NSDictionary]()
arr.append(["name":"blue","view":"<object id=\"6787\">","visible":"true","locked":"false"])
arr.append(["name":"yellow","view":"<object id=\"345\">","visible":"true","locked":"false"])
arr.append(["name":"green","view":"<object id=\"123\">","visible":"false","locked":"true"])

//test remove
arr.removeAtIndex(2)

arr.count

//test edit
let nameChange = arr[1]
nameChange.setValue("black", forKey: "name")

arr[1]

But an error occurred, and I can not solve:

Some can help me?

sunshinejr · Accepted Answer · 2015-12-21 22:54:05Z

5

Because you created your dictionary as NSDictionary - the values can't change once they are set. But you still want to change them using setValue() and thats why you have the error. The fix is easy, change it to NSMutableDictionary. BUT. You shouldn't use Objective-C API, when you have Swift API. Thats why you should use Swift's Dictionary. How? e.g.

var arr = [[String:String]]()
arr.append(["name":"blue","view":"<object id=\"6787\">","visible":"true","locked":"false"])
arr.append(["name":"yellow","view":"<object id=\"345\">","visible":"true","locked":"false"])
arr.append(["name":"green","view":"<object id=\"123\">","visible":"false","locked":"true"])

//test remove
arr.removeAtIndex(2)

arr.count

//test edit
var nameChange = arr[1]
nameChange["name"] = "black"

edited Dec 21, 2015 at 22:54

answered Dec 21, 2015 at 22:50

sunshinejr

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Kavin Kumar Arumugam · Accepted Answer · 2016-12-23 09:29:06Z

-1

Finally Got Some Code,

let DuplicateArray: NSArray = array
let DuplicateMutableArray: NSMutableArray = []
DuplicateMutableArray.addObjectsFromArray(DuplicateArray as [AnyObject])
var dic = (DuplicateMutableArray[0] as! [NSObject : AnyObject])
dic["is_married"] = "false"
DuplicateMutableArray[self.SelectedIndexPath] = dic
array = []
array = (DuplicateMutableArray.copy() as? NSArray)!

//Output Will Be Like

array =  [
  {
    "name": "Kavin",
    "Age": 25,
    "is_married": "false"
  },
  {
    "name": "Kumar",
    "Age": 25,
    "is_married": "false"
  }

]

answered Dec 23, 2016 at 9:29

Kavin Kumar Arumugam

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