iOS 10.0之前和之后的Local Notification有神马不同

在iOS 10.0之前apple还没有将通知功能单独拿出来自成一系.而从10.0开始原来的本地通知仍然可用,只是被标记为过时.于是乎我们可以使用10.0全新的通知功能.别急…让我们慢慢来,先从iOS 10.0之前的本地通知讲起吧 ;)

这里不会面面俱到,因为不是面向初学者.如果你有一定的iOS开发经验相信可以很快掌握知识要点.如果是初学者也没关系,你可以在本篇blog后面直接提问,如有时间我会为你解答.

iOS < 10.0

我们首先要取得访问权限:

let notificationSettings = UIUserNotificationSettings(types: [.alert,.badge,.sound], categories: nil)        UIApplication.shared.registerUserNotificationSettings(notificationSettings)

接下来是发送本地通知:

@IBAction func scheduleLocal(_ sender: AnyObject) {        //如果取不到当前通知的设置数据则直接退出        guard let settings = UIApplication.shared.currentUserNotificationSettings else{            return        }        //如果用户权限为.none则提示用户未授权        if settings.types == UIUserNotificationType(rawValue: 0){            let ac = UIAlertController(title: "Can't schedule", message: "Either we don't have permission to schedule notifications, or we haven't asked yet.", preferredStyle: .alert)            ac.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))            present(ac, animated: true, completion: nil)            return        }        //开始设置本地通知        let notification = UILocalNotification()        notification.fireDate = Date(timeIntervalSinceNow: 20)        notification.alertBody = "Hey you! Yeah you! Swipe to unlock!"        notification.alertAction = "be awesome!"        notification.soundName = UILocalNotificationDefaultSoundName        notification.userInfo = ["CustomField1":"w00t"]        //发送本地通知        UIApplication.shared.scheduleLocalNotification(notification)    }

最后是本地通知的接收,这分为两种情况:

1. 通知到达时App未退出
2. 通知到达时App已退出

对于第一种情况我们实现以下方法来接收处理通知:

func application(_ application: UIApplication, didReceive notification: UILocalNotification) {        if let userInfo = notification.userInfo{            let customField1 = userInfo["CustomField1"] as! String            print("\(#function) recive a notification: customField1 is \(customField1)")        }    }

而对于后者我们在didFinishLaunchingWithOptions方法中处理通知:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {        if let options = launchOptions{            if let notification = options[UIApplicationLaunchOptionsKey.localNotification] as? UILocalNotification{                if let userInfo = notification.userInfo{                    let customField1 = userInfo["CustomField1"] as! String                    print("when App did launch,recive a noficition:customField1 is \(customField1)")                    //do anything you want!!!                }            }        }        return true    }

iOS >= 10.0

在iOS 10.0中apple为通知添加了单独的框架UserNotifications,一切通知都要围绕它打交道哦.

首先同样是询问用户访问权限:

@IBAction func regNotification(_ sender: AnyObject) {        if #available(iOS 10.0, *){            let center = UNUserNotificationCenter.current()            center.getNotificationSettings {settings in                print(settings)            }            center.requestAuthorization(options: [.alert,.sound]) {(granted,error) in                if let err = error{                    self.msg(title: "Error", string: "本地通知授权时发生了错误:\(err.localizedDescription)")                }else if !granted{                    self.msg(title: "Error", string: "你没有获得本地通知的许可")                }            }        }    }

接着你需要设置通知中心的委托,我把它放在didFinishLaunchingWithOptions方法中:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {        let center = UNUserNotificationCenter.current()        center.delegate = self        return true    }

注意这里didFinishLaunchingWithOptions方法已不再处理本地通知,在iOS 10.0中所有的通知接收处理都放在一个地方,无论App是运行还是退出,这个后面会说到.

接下来是发送本地通知:

@IBAction func sendNotification(_ sender: AnyObject) {        let center = UNUserNotificationCenter.current()        let content = UNMutableNotificationContent()        content.title = "Hello!"        content.body = "你好世界!!!"        content.sound = UNNotificationSound.default()        content.userInfo = ["key0":"value0"]        //content.badge = NSNumber(value: UIApplication.shared.applicationIconBadgeNumber + 1)        content.categoryIdentifier = "com.hopy.localNotification"        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5.0, repeats: false)        let request = UNNotificationRequest(identifier: "FiveSecond", content: content, trigger: trigger)        center.add(request){[unowned self] error in            if let err = error{                self.msg(title: "ERROR", string: "NotificationCenter add N failed:\(err.localizedDescription)")            }else{                //do anything you want!            }        }    }

最后是本地通知的接收,我们为AppDelegate添加UNUserNotificationCenterDelegate协议,然后实现如下方法:

//在展示通知前进行处理,有机会在展示通知前再修改通知内容    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {        //do any stuff!!        completionHandler(UNNotificationPresentationOptions.alert)    }    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {        let notification = response.notification        notificationInfo = notification.request.content.userInfo        //do any stuff!!!        completionHandler()    }