swift - 更改字典 swift 5 数组中的值

Question

我正在使用 xcode 10.2 和 swift 5

我需要更改“arrNotificationList”中“selected”key = false/true 的所有值

    // 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],
        ])

我已尝试使用以下代码，但原始数组“arrNotificationList”值未更改。

        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
        }

Answer 1

要更改数组元素，请使用 map函数而不是 forEach .然后在map函数中返回change改变的字典

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)