使用UILocalNotification可以很方便的實現消息的推送功能。我們可以設置這個消息的推送時間，推送內容等。 當推送時間一到，不管用戶在桌面還是其他應用中，屏幕上方會都顯示出推送消息。
1,推送消息的發送 ??

--- AppDelegate.swift ---

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import UIKit @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { ????var window: UIWindow? ????func application(application: UIApplication, ????????didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { ????????//開啟通知 ????????let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], ????????????categories: nil) ????????application.registerUserNotificationSettings(settings) ????????return true ????} ????func applicationWillResignActive(application: UIApplication) { ????} ????func applicationDidEnterBackground(application: UIApplication) { ????} ????func applicationWillEnterForeground(application: UIApplication) { ????} ????func applicationDidBecomeActive(application: UIApplication) { ????} ????func applicationWillTerminate(application: UIApplication) { ????} }

--- ViewController.swift ---

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import UIKit class ViewController: UIViewController { ????override func viewDidLoad() { ????????super.viewDidLoad() ????????? ????????//發送通知消息 ????????scheduleNotification(12345); ????????//清除所有本地推送 ????????//UIApplication.sharedApplication().cancelAllLocalNotifications() ????} ????? ????//發送通知消息 ????func scheduleNotification(itemID:Int){ ????????//如果已存在該通知消息，則先取消 ????????cancelNotification(itemID) ????????? ????????//創建UILocalNotification來進行本地消息通知 ????????let localNotification = UILocalNotification() ????????//推送時間（設置為30秒以后） ????????localNotification.fireDate = NSDate(timeIntervalSinceNow: 30) ????????//時區 ????????localNotification.timeZone = NSTimeZone.defaultTimeZone() ????????//推送內容 ????????localNotification.alertBody = "來自hangge.com的本地消息" ????????//聲音 ????????localNotification.soundName = UILocalNotificationDefaultSoundName ????????//額外信息 ????????localNotification.userInfo = ["ItemID":itemID] ????????UIApplication.sharedApplication().scheduleLocalNotification(localNotification) ????} ????? ????//取消通知消息 ????func cancelNotification(itemID:Int){ ????????//通過itemID獲取已有的消息推送，然后刪除掉，以便重新判斷 ????????let existingNotification = self.notificationForThisItem(itemID) as UILocalNotification? ????????if existingNotification != nil { ????????????//如果existingNotification不為nil，就取消消息推送 ????????????UIApplication.sharedApplication().cancelLocalNotification(existingNotification!) ????????} ????} ????? ????//通過遍歷所有消息推送，通過itemid的對比，返回UIlocalNotification ????func notificationForThisItem(itemID:Int)-> UILocalNotification? { ????????let allNotifications = UIApplication.sharedApplication().scheduledLocalNotifications ????????for notification in allNotifications! { ????????????let info = notification.userInfo as! [String:Int] ????????????let number = info["ItemID"] ????????????if number != nil && number == itemID { ????????????????return notification as UILocalNotification ????????????} ????????} ????????return nil ????} ????? ????override func didReceiveMemoryWarning() { ????????super.didReceiveMemoryWarning() ????} }

2，點擊推送消息的響應 收到推送，如果點擊推送內容，則會重新進入到App，這個時候會調用AppDelegate中的func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification)代理方法。 在這個方法中我們可以根據推送的消息內容實現相關的功能。

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func application(application: UIApplication, ????didReceiveLocalNotification notification: UILocalNotification) { ????????//設定Badge數目 ????????UIApplication.sharedApplication().applicationIconBadgeNumber = 0 ????????????? ????????let info = notification.userInfo as! [String:Int] ????????let number = info["ItemID"] ????????????? ????????let alertController = UIAlertController(title: "本地通知", ????????????????message: "消息內容：\(notification.alertBody)用戶數據：\(number)", ????????????????preferredStyle: UIAlertControllerStyle.Alert) ????????????? ????????self.window?.rootViewController!.presentViewController(alertController, ????????????????animated: true, completion: nil) }

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