推送通知，即时消息接收，如Whatsapp或Viber

Question

当Whatsapp(或Viber) iOS应用程序完全关闭(从后台删除)时，消息接收将按预期通过推送通知处理。
当你从推送通知中唤醒Whatsapp(或Viber)时，它会立即显示所有收到的消息，而无需明确花费任何时间从服务器下载。
实际上，看起来每个推送通知都有足够的时间唤醒应用程序来下载已发送的消息，我认为这在iOS中是不可能的。

有人知道他们是如何实现快速接收一堆消息的吗?

Answer 1

你可能应该使用PushKit，以及Voice over IP背景模式在你的Xcode Project> Capabilities窗格中启用。这样，VoIP推送通知可以唤醒您的应用程序，因此您可以处理接收到的数据并显示它。此外，与标准推送通知相比，VoIP推送有几个优势。

Answer 2

你的应用程序在后台被调用，不管它是在后台模式还是杀死模式。你的应用程序将被激活到你的本地通知应该播放(最多30秒)。

使用下面的结构来完成你的任务。

使用simplepush.php文件

<?php
// Put your device token here (without spaces):
    
      $deviceToken = '1234567890123456789';
//
    
// Put your private key's passphrase here:
$passphrase = 'ProjectName';
// Put your alert message here:
$message = 'My first push notification!';

$ctx = stream_context_create();
stream_context_set_option($ctx, 'ssl', 'local_cert', 'PemFileName.pem');
stream_context_set_option($ctx, 'ssl', 'passphrase', $passphrase);
// Open a connection to the APNS server
$fp = stream_socket_client(
//  'ssl://gateway.push.apple.com:2195', $err,
    'ssl://gateway.sandbox.push.apple.com:2195', $err,
    $errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx);
if (!$fp)
    exit("Failed to connect: $err $errstr" . PHP_EOL);
echo 'Connected to APNS' . PHP_EOL;
// Create the payload body
$body['aps'] = array(
                     'content-available'=> 1,
                     'alert' => $message,
                     'sound' => 'default',
                     'badge' => 0,
                     );
    
// Encode the payload as JSON
    
$payload = json_encode($body);
// Build the binary notification
$msg = chr(0) . pack('n', 32) . pack('H*', $deviceToken) . pack('n', strlen($payload)) . $payload;
// Send it to the server
$result = fwrite($fp, $msg, strlen($msg));
if (!$result)
    echo 'Message not delivered' . PHP_EOL;
else
    echo 'Message successfully delivered' . PHP_EOL;
// Close the connection to the server
fclose($fp);

使用下面的命令创建pem文件并在上面的代码中使用

$ openssl x509 -in aps_development.cer -inform der -out PushCert.pem
# Convert .p12 to .pem. Enter your pass pharse which is the same pwd that you have given while creating the .p12 certificate. PEM pass phrase also same as .p12 cert.  
$ openssl pkcs12 -nocerts -out PushKey1.pem -in pushkey.p12
Enter Import Password:
MAC verified OK
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
# To remove passpharse for the key to access globally. This only solved my stream_socket_client() & certificate capath warnings.
$ openssl rsa -in PushKey1.pem -out PushKey1_Rmv.pem
Enter pass phrase for PushChatKey1.pem:
writing RSA key
# To join the two .pem file into one file:
$ cat PushCert.pem PushKey1_Rmv.pem > ApnsDev.pem

之后转到simplepush.php位置并输入命令->php simplepush.php

这样你就可以测试你的推送套件通知设置架构。

https://www.raywenderlich.com/123862/push-notifications-tutorial

下载

import UIKit
import PushKit

class AppDelegate: UIResponder, UIApplicationDelegate,PKPushRegistryDelegate{

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    let types: UIRemoteNotificationType = [.Alert, .Badge, .Sound]
    application.registerForRemoteNotificationTypes(types)
    self. PushKitRegistration()
    return true
}

//MARK: - PushKitRegistration
func PushKitRegistration()
{
    let mainQueue = dispatch_get_main_queue()
    // Create a push registry object
    if #available(iOS 8.0, *) {
        let voipRegistry: PKPushRegistry = PKPushRegistry(queue: mainQueue)
        // Set the registry's delegate to self
        voipRegistry.delegate = self
        // Set the push type to VoIP
        voipRegistry.desiredPushTypes = [PKPushTypeVoIP]
    } else {
        // Fallback on earlier versions
    }

}

@available(iOS 8.0, *)
func pushRegistry(registry: PKPushRegistry!, didUpdatePushCredentials credentials: PKPushCredentials!, forType type: String!) {
    // Register VoIP push token (a property of PKPushCredentials) with server
    let hexString : String = UnsafeBufferPointer<UInt8>(start: UnsafePointer(credentials.token.bytes),
        count: credentials.token.length).map { String(format: "%02x", $0) }.joinWithSeparator("")
    print(hexString)

}

@available(iOS 8.0, *)
func pushRegistry(registry: PKPushRegistry!, didReceiveIncomingPushWithPayload payload: PKPushPayload!, forType type: String!) {
    // Process the received push
    // From here you have to schedule your local notification
}
}