Difference between revisions of "Swift:Notification Observer Using NSNotificationCenter"

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(Listen Notification in Swift)
(Listen Notification in Swift)
Line 4: Line 4:
 
     let newTweet:Dictionary<String, Tweet> = notification.userInfo as Dictionary<String, Tweet>
 
     let newTweet:Dictionary<String, Tweet> = notification.userInfo as Dictionary<String, Tweet>
 
}
 
}
NSNotificationCenter.defaultCenter().addObserver(self, selector: "tweetSent:", name: "newTweetNotification", object: nil) //The colon : is not a typo. It indicates it will take a parameter
+
//The colon in "tweetSent:" is not a typo. It indicates it will take a parameter
 +
NSNotificationCenter.defaultCenter().addObserver(self, selector: "tweetSent:", name: "newTweetNotification", object: nil)  
 
</pre>
 
</pre>
  

Revision as of 06:50, 23 March 2015

Listen Notification in Swift

func tweetSent(notification: NSNotification) {
    let newTweet:Dictionary<String, Tweet> = notification.userInfo as Dictionary<String, Tweet>
}
//The colon in "tweetSent:" is not a typo. It indicates it will take a parameter
NSNotificationCenter.defaultCenter().addObserver(self, selector: "tweetSent:", name: "newTweetNotification", object: nil) 

Send/Post Notification in Swift

var userInfo: Dictionary<String, Tweet> = ["tweet": newTweet]
NSNotificationCenter.defaultCenter().postNotificationName("newTweetNotification", object: nil, userInfo: userInfo)

Remove Notification Observer

deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self)
}