swift 如何在IOS应用图标上添加消息数

　　在应用图标右上角添加消息数提醒，可以很方便的告知用户该应用中有无新消息需要处理。下面用xcode 7.3.1来简要说明一下如何用swift语言进行此功能的实现。

1、修改 AppDelegate.swift

//
//  AppDelegate.swift
//  RainbowDemo
//
//  Created by Jackwang on 16/8/17.
//  Copyright © 2016年 Jackwang . All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        //使用UILocalNotification除了可以实现本地消息的推送功能（可以设置推送内容，推送时间，提示音），
        //还可以设置应用程序右上角的提醒个数。
        let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound],
                                                  categories: nil)
        application.registerUserNotificationSettings(settings)
        
        
        return true
    }

    func applicationWillResignActive(application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(application: UIApplication) {
        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

2 修改在ViewController.swift

//
//  ViewController.swift
//  RainbowDemo
//
//  Created by jackwang on 16/8/17.
//  Copyright © 2016年 jackwang. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        //发送通知消息
        scheduleNotification();
    }
    
    //发送通知消息
    func scheduleNotification(){
        //清除所有本地推送
        UIApplication.sharedApplication().cancelAllLocalNotifications()
        
        //创建UILocalNotification来进行本地消息通知
        let localNotification = UILocalNotification()
        //设置应用程序右上角的提醒个数
        localNotification.applicationIconBadgeNumber = 8;
        UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

3 编译运行

第一次会弹出询问是否允许推送消息，确认后，第二次运行该app后，会在图标右上角标注消息数，如下图所示：

修改APP的显示名称，可以单击info.plist，然后修改器Bundle name,如下图所示：