pushkit方式，有别于普通的apns，它不会弹出通知，而是悄悄的告诉我们的app有推送过来，让app做出相应的处理。

 所以当pushkit回调方法里使用本地推送来处理

当app在线，后台，离线pushkit都有推送此时当在线时不希望弹出本地推送的状态栏。

第一步：申请证书。

步骤：

1）跟apns差不多，在Creating a VoIP certificate in the Apple Developer Member Center

Production中选择VoIP Services certificate.

2）生成的证书CertificateSigningRequest.cerSigningRequest，下载证书voip_services.cer.

客户端和pushkit server端都安装这个证书

3）客户端从“钥匙串”->左侧:我的证书->VoIP Services:com.testxx.suiyizhengshu.右击导出此证书。格式可以选：.p12,.cer等格式。

4）VoIP不区分生产环境还是开发环境（production or development）也就是生成的证书是一个。

第二步：ios客户端

1）Xcode Project > Capabilities pane。Enabling the VoIP background mode in an app。

Background Modes：Voice over IP。

题外话：我因为个人原因很久没升级xcode，发现没有这选项，xcode升级到10就出现了。当然mac系统也升级到MacOSHighSierra10.16.6。话说升级mac，各种折腾，后来重装mac系统才升级成功。

借鉴：

a.https://jingyan.baidu.com/article/d169e1867d1d7d436711d86a.html 重装Mac系统，苹果电脑重装，其实很简单

b.https://support.apple.com/zh-cn/macos/high-sierra 升级到macOS High Sierra

c.http://blog.sina.com.cn/s/blog_67a6d62e0102xae7.html Mac电脑如何清理硬盘空间

2）

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    //注册pushkit

    [self registePushKitApi];

}

//注册pushkit

- (void)registePushKitApi {

    // 注册PushKit

    PKPushRegistry *pushRegistry = [[PKPushRegistry alloc] initWithQueue: nil];

    pushRegistry.delegate = self;

    pushRegistry.desiredPushTypes = [NSSet setWithObject: PKPushTypeVoIP];

    

    // 注册push权限，用于显示本地推送

    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];

}

#pragma - pushkitDelegate

// PushKit delete

- (void)pushRegistry:(PKPushRegistry *)registry didUpdatePushCredentials:(PKPushCredentials *)credentials forType:(PKPushType)type {

    //去掉server发回来token中的<>，空格不去掉，具体情况视PushKit server决定

    NSString * tokenString = [[[credentials.token description] stringByReplacingOccurrencesOfString: @"<" withString: @""] stringByReplacingOccurrencesOfString: @">" withString: @""];

    SpeLog(@"PushKit toke: %@", tokenString);

    

   

}

备注：把credentials.token提供给pushkit server端。

- (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayload:(PKPushPayload *)payload forType:(PKPushType)type {

    

    // 从payload中获取推送信息

    NSDictionary *dic = payload.dictionaryPayload;

    NSDictionary *apsDic = dic[@"aps"];

    NSString *msgId = dic[@"msg_id"];

    

    // 此处也可以根据message_id获取消息具体内容，然后在block中发送本地推送

    // ...

    

    // 生成本地推送

    UILocalNotification* localNotification = [[UILocalNotification alloc] init];

    localNotification.fireDate = [NSDate date];

    localNotification.alertBody = apsDic[@"alert"];

    localNotification.soundName = @"default";

    localNotification.alertTitle = @"一条测试pushkit的推送";

    localNotification.userInfo = [[NSDictionary alloc] initWithObjectsAndKeys: msgId, @"msgid", nil];

    [[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];

}

备注：pushkit server端的payload即是上面回调函数中的payload.dictionaryPayload：

格式如下：

{

“aps":{"alert":"This is some fancy message.","badge”:1},

“msg_id”:”12345678”

}

-(void)pushRegistry:(PKPushRegistry *)registry didInvalidatePushTokenForType:(PKPushType)type {

    NSLog(@"didInvalidatePushTokenForType");

}

第三步骤，Pushkit server端解析

server端代码：https://github.com/stefanhafeneger/PushMeBaby 

1.打开：README.md。就是把生成的证书起个生产证书名称：aps0.cer,开发模式：aps_development0.cer.其实是同一个证书，只是名字不一样。替换项目中的./PushMeBaby-master这个目录下面的aps0.cer，aps—development0.cer。

2.server端production地址：gateway.push.apple.com。development地址：gateway.sandbox.push.apple.com。

.const char *hostName = _production?"gateway.push.apple.com":"gateway.sandbox.push.apple.com";

3.self->_certificateRef:

com.testxx.suiyizhengshu i: Apple Worldwide Developer Relations Certification Authority>

参考文章：

1.https://www.jianshu.com/p/213641cf524a PushKit 的简单实验 作者：谁动了我的芝麻糖

2.Pushkit官网：https://developer.apple.com/library/archive/documentation/Performance/Conceptual/EnergyGuide-iOS/OptimizeVoIP.html 

3.https://www.jianshu.com/p/afc8de658931 PushKit的使用 作者：Pooonyo