how to pass multiple values with a notification in swift
You can use the userInfo
property of Notification
:
NotificationCenter.default.post(name: Notification.Name("refresh"),
object: nil,
userInfo: ["number":yourNumber, "string":yourString])
and to retrieve:
func refreshList(notification: Notification){
let receivednumber = notification.userInfo?["number"] as? Int ?? 0
let receivedString = notification.userInfo?["string"] as? String ?? ""
}
Swift 4 or later
Declare a notification name to be used
extension Notification.Name {
static let refresh = Notification.Name("refresh")
}
Add an observer for that name in your view controller viewDidLoad method and a selector to get the notification object
NotificationCenter.default.addObserver(self, selector: #selector(refreshList), name: .refresh, object: nil)
@objc func refreshList(_ notification: Notification) {
if let object = notification.object as? [String: Any] {
if let id = object["id"] as? Int {
print(id)
}
if let email = object["email"] as? String {
print(email)
}
}
}
Post your notification with your object:
let object: [String: Any] = ["id": 1, "email": "[email protected]"]
NotificationCenter.default.post(name: .refresh, object: object)
You could wrap them in an NSArray
or a NSDictionary
or a custom Object.
Eg:
let mynumber=1;
let mytext="mytext";
let myDict = [ "number": mynumber, "text":mytext]
NSNotificationCenter.defaultCenter().postNotificationName("refresh", object:myDict);
func refreshList(notification: NSNotification){
let dict = notification.object as! NSDictionary
let receivednumber = dict["number"]
let receivedString = dict["mytext"]
}