关于iOSpush我们一般都会使用一些第三方SDK。最近因为项目需求需要使用系统push。这里总结下系统push的一些知识点：

关于push的证书这里就不介绍了。服务器方面：只需要把p12证书给到就行。

1、客户端注册、获取deviceToken

证书配置好了，下一步我们要获取deviceToken，用于推送到客户端设备。这个deviceToken也需要上传给服务器，否则无法push。

由于iOS10及以上把本地通知和远程通知都集成在了UserNotifications库里面，所以register push我们需要适配下系统版本：

- (void)registerSystemPushWithApplication:(UIApplication *)application
{
    //iOS10及以上使用UserNotifications框架
    if ([NSProcessInfo.processInfo isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){10,0,0}]){
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        center.delegate = self;
        [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert) completionHandler:^(BOOL granted, NSError * _Nullable error) {
            if (!error) {
                NSLog(@"request authorization succeeded!");
            }
        }];
    }
    else{
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil];
        [application registerUserNotificationSettings:settings];
    }
    
    // 注册获得device Token
    [[UIApplication sharedApplication] registerForRemoteNotifications];
}

注册成功之后，会在Appdelegate里面输出deviceToken

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    NSLog(@"token:%@",deviceToken);
}

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
    NSLog(@"push register error:%@",error);
}

注意（注册失败）：

1、确认证书没有问题
2、使用真机
3、如下图，push Noti需要打开开关

屏幕快照 2017-09-04 下午2.09.37.png

客户端接收push消息

接收也需要按系统来分别处理,iOS7以上10以下

- (void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:
(void (^)(UIBackgroundFetchResult))completionHandler {
    UIApplicationState state = [UIApplication sharedApplication].applicationState;
    if (state == UIApplicationStateActive) {
        //app在前台
        [[SystemPushManage sharedSystemPushManage] activePushControllerWithUserInfo:userInfo];
    }
    else if (state == UIApplicationStateInactive){
        [[SystemPushManage sharedSystemPushManage] backgroundPushControllerWithUserInfo:userInfo];
    }
    DLog(@"iOS7及以上系统，收到通知:%@", userInfo);
    completionHandler(UIBackgroundFetchResultNewData);
}

关于iOS10及以上请查看这个DEMO