iOS 消息推送包括遠(yuǎn)程推送通知(Remote Notification)和本地推送通知(Local Notification)，推送通知的形式從頂部顯示，屏幕中間顯示，鎖屏通知，更新App未讀消息數(shù)字.

遠(yuǎn)程通知

iOS 遠(yuǎn)程推送通知需要在App中開(kāi)啟推送通知選項(xiàng)，申請(qǐng)推送證書(shū)，實(shí)際推送過(guò)程如下圖:

推送通知.png

App打開(kāi)推送開(kāi)關(guān)，用戶(hù)要確認(rèn)TA希望獲得該App的推送消息.
① iPhone 與 蘋(píng)果服務(wù)器建立長(zhǎng)連接.
② APNS 遠(yuǎn)程推送推送服務(wù)返回deviceToken.
③ 客戶(hù)端App 將DeviceToken 與 用戶(hù)ID上傳至服務(wù)端.
④ 服務(wù)端根據(jù)推送消息系統(tǒng)，將對(duì)應(yīng)的消息，按照devicetoken發(fā)送至APNS.
⑤ APNS 將消息推送至客戶(hù)端.

本地通知

本地消息一般比較少見(jiàn)，加入正在做一個(gè)To-do的工具類(lèi)應(yīng)用，對(duì)于用戶(hù)加入的每一個(gè)事項(xiàng)，都會(huì)有一個(gè)完成的時(shí)間點(diǎn)，用戶(hù)可以要求這個(gè)To-do應(yīng)用在事項(xiàng)過(guò)期之前的某一個(gè)時(shí)間點(diǎn)提醒一下TA。為了達(dá)到這一目的，App就可以調(diào)度一個(gè)本地通知，在時(shí)間點(diǎn)到了之后發(fā)出一個(gè)Alert消息或者其他提示.

本地通知比較好模擬，iOS 10 中通知有所改變，AppDelegate中注冊(cè)通知:
<pre><code>` func registerLocalNotification() {

    let center:UNUserNotificationCenter = UNUserNotificationCenter.current()
    center.delegate = self
    
    center.requestAuthorization(options: [.alert,.sound]) { (granted, error) in
        if granted {
            print("注冊(cè)成功")
            center.getNotificationSettings(completionHandler: { (settings) in
                print("通知設(shè)置---\(settings)")
            })
        } else {
            print("注冊(cè)失敗")
        }
    }
    
}`</code></pre>

實(shí)現(xiàn)UNUserNotificationCenterDelegate:
<pre><code>` func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
print("didReceive 接受通知")
}

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    print("iOS10 通知")
    completionHandler( [.alert,.sound,.badge])
}

`</code></pre>

發(fā)送通知:
<pre><code>` let content:UNMutableNotificationContent = UNMutableNotificationContent()
content.body = "Body:你現(xiàn)在學(xué)習(xí)成績(jī)不錯(cuò)，繼續(xù)加油哦"
content.title = "Title:溫馨提示"
content.subtitle = "Subtitle:FlyElephant"
content.sound = UNNotificationSound.default()
content.categoryIdentifier = requestIdentifier

    if let path = Bundle.main.path(forResource: "test", ofType: "jpg") {
        let url = URL(fileURLWithPath: path)
        
        do {
            let attachment = try UNNotificationAttachment(identifier: "testImage", url: url, options: nil)
            content.attachments = [attachment]
        } catch {
            print("文件不存在.")
        }
    }
    
    
    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 3, repeats: false)
    let request = UNNotificationRequest(identifier: "FlyElephant-Trrigger", content: content, trigger: trigger) // 請(qǐng)求通知
    let center = UNUserNotificationCenter.current()
    center.add(request) { (error : Error?) in
        if let theError = error {
            print("通知--\(theError)")
        }
        print("通知成功")
    }`</code></pre>

取消通知:
<pre><code>let center = UNUserNotificationCenter.current() center.removePendingNotificationRequests(withIdentifiers: [requestIdentifier])</code></pre>

測(cè)試效果:

FlyElephant.png