CODEWITHSUNDEEP
swift
Vivek
Vivek

Reputation: 5213

Change value in array of dictionary swift 5

I am using xcode 10.2 and swift 5

I need to change all values from "selected" key = false/true in "arrNotificationList"

    // Create mutable array
    var arrNotificationList = NSMutableArray()

    // viewDidLoad method code
    arrNotificationList.addObjects(from: [
        ["title":"Select All", "selected":true],
        ["title":"Match Reminder", "selected":false],
        ["title":"Wickets", "selected":false],
        ["title":"Half-Centure", "selected":false],
        ])

I have try with below code but original array "arrNotificationList" value not changed.

        arrNotificationList.forEach { value in
            print("\(value)")
            var dictNotification:[String:Any] = value as! [String : Any]
            dictNotification["selected"] = sender.isOn // this is switch value which is selected by user on/off state
        }

Upvotes: 1

Views: 5659

Answers (2)

PGDev
PGDev

Reputation: 24341

First of all, instead of using NSMutableArray, use Swift array of type [[String:Any]], i.e.

var arrNotificationList = [[String:Any]]() //array of dictionaries

arrNotificationList.append(contentsOf: [
    ["title":"Select All", "selected":true],
    ["title":"Match Reminder", "selected":false],
    ["title":"Wickets", "selected":false],
    ["title":"Half-Centure", "selected":false],
    ])

Now, since it is an array of dictionary, and dictionary is a value type, so any changes done to it in foreach loop won't reflect in the original dictionary.

Use map(_:) to get a new array with selected = sender.isOn for all the dictionaries in arrNotificationList array.

        arrNotificationList = arrNotificationList.map {
            ["title": $0["title"], "selected": sender.isOn]
        }

Upvotes: 1

RajeshKumar R
RajeshKumar R

Reputation: 15748

To change elements of an array use map function instead of forEach. Then return change changed dictionary in map function 

var arrNotificationList = [[String:Any]]()

arrNotificationList = [["title":"Select All", "selected":true],
                        ["title":"Match Reminder", "selected":false],
                        ["title":"Wickets", "selected":false],
                        ["title":"Half-Centure", "selected":false]]
arrNotificationList = arrNotificationList.map({
    var dict = $0
    dict["selected"] = sender.isOn
    return dict
})
print(arrNotificationList)

Upvotes: 4

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