How to send and receive data in Today extensions

Question

I want to develop an app for iOS that have a Widget for notification center, but I don't know how I should send and receive data (pass data) between View Controller and And Today Extension.

I tried to use structs, but it doesn't work, and also I used app groups but I don't want to use this method.

let shared = NSUserDefaults(suiteName: "group.Demo.Share-Extension-Demo.mahdi")
shared?.setObject("Hello", forKey: "kkk")

Answer 1

Apart from NSUserDefaults, you can use the NSNotificationCenter to send or receive data anywhere.

You need to set the observer where you can receive the data like below:

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "dataReceived:", name: "SpecialKey", object: nil)    
}

Funciton to catch data:

func dataReceived(notification: NSNotification) {
    //deal with notification.userInfo
    println(notification.userInfo)

    println("Received Data")
}

And you need to define NSNotificationCenter from where you need to send the data:

NSNotificationCenter.defaultCenter().postNotificationName("SpecialKey", object: nil, userInfo: ["MyData": "Demo"])

References:

The complete guide to NSNotificationCenter

Hope it helps!

http://moreindirection.blogspot.in/2014/08/nsnotificationcenter-swift-and-blocks.html