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

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(Listen Notification in Swift)
 
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==Listen Notification in Wwift==
+
==Listen Notification in Swift==
 
<pre class="brush:swift">
 
<pre class="brush:swift">
 
func tweetSent(notification: NSNotification) {
 
func tweetSent(notification: NSNotification) {
 
     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 in "tweetSent:" is not a typo. It indicates the function will take a parameter
 +
NSNotificationCenter.defaultCenter().addObserver(self, selector: "tweetSent:", name: "newTweetNotification", object: nil)  
 
</pre>
 
</pre>
==Send/Post Notification in Wwift==
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 +
==Send/Post Notification in Swift==
 
<pre class="brush:swift">
 
<pre class="brush:swift">
 
var userInfo: Dictionary<String, Tweet> = ["tweet": newTweet]
 
var userInfo: Dictionary<String, Tweet> = ["tweet": newTweet]
 
NSNotificationCenter.defaultCenter().postNotificationName("newTweetNotification", object: nil, userInfo: userInfo)
 
NSNotificationCenter.defaultCenter().postNotificationName("newTweetNotification", object: nil, userInfo: userInfo)
 
</pre>
 
</pre>
==Remove Notification Bbserver==
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==Remove Notification Observer==
 
<pre class="brush:swift">
 
<pre class="brush:swift">
 
deinit {
 
deinit {

Latest 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 the function 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)
}