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Swift - 设置应用程序图标的提醒个数（右上角小红圈）

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。

下面演示如何设置，效果图如下：

--- AppDelegate.swift ---

import UIKit
 
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
 
    var window: UIWindow?
 
    func application(_ application: UIApplication, didFinishLaunchingWithOptions
        launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        //开启通知
        let settings = UIUserNotificationSettings(types: [.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();
    }
     
    //发送通知消息
    func scheduleNotification(){
        //清除所有本地推送
        UIApplication.shared.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 = 78;
        UIApplication.shared.scheduleLocalNotification(localNotification)
    }
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}