Swift

使用UILocalNotification可以很方便的实现消息的推送功能。我们可以设置这个消息的推送时间，推送内容等。

当推送时间一到，不管用户在桌面还是其他应用中，屏幕上方会都显示出推送消息。

1,推送消息的发送

   

--- AppDelegate.swift ---

import UIKit   @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {       var window: UIWindow?       func application(application: UIApplication,         didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {         //开启通知         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 ---

import UIKit   class ViewController: UIViewController {     override func viewDidLoad() {         super.viewDidLoad()                   //发送通知消息         scheduleNotification(12345);         //清除所有本地推送         //UIApplication.sharedApplication().cancelAllLocalNotifications()     }           //发送通知消息     func scheduleNotification(itemID:Int){         //如果已存在该通知消息，则先取消         cancelNotification(itemID)                   //创建UILocalNotification来进行本地消息通知         let localNotification = UILocalNotification()         //推送时间（设置为30秒以后）         localNotification.fireDate = NSDate(timeIntervalSinceNow: 30)         //时区         localNotification.timeZone = NSTimeZone.defaultTimeZone()         //推送内容         localNotification.alertBody = "来自hangge.com的本地消息"         //声音         localNotification.soundName = UILocalNotificationDefaultSoundName         //额外信息         localNotification.userInfo = ["ItemID":itemID]         UIApplication.sharedApplication().scheduleLocalNotification(localNotification)     }           //取消通知消息     func cancelNotification(itemID:Int){         //通过itemID获取已有的消息推送，然后删除掉，以便重新判断         let existingNotification = self.notificationForThisItem(itemID) as UILocalNotification?         if existingNotification != nil {             //如果existingNotification不为nil，就取消消息推送             UIApplication.sharedApplication().cancelLocalNotification(existingNotification!)         }     }           //通过遍历所有消息推送，通过itemid的对比，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，点击推送消息的响应

收到推送，如果点击推送内容，则会重新进入到App，这个时候会调用AppDelegate中的func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification)代理方法。

在这个方法中我们可以根据推送的消息内容实现相关的功能。

func application(application: UIApplication,     didReceiveLocalNotification notification: UILocalNotification) {         //设定Badge数目         UIApplication.sharedApplication().applicationIconBadgeNumber = 0                       let info = notification.userInfo as! [String:Int]         let number = info["ItemID"]                       let alertController = UIAlertController(title: "本地通知",                 message: "消息内容：(notification.alertBody)用户数据：(number)",                 preferredStyle: UIAlertControllerStyle.Alert)                                 let cancel = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil);                             alertController.addAction(cancel);               self.window?.rootViewController!.presentViewController(alertController,                 animated: true, completion: nil) }