APNs推送的系统做法

1、

#pragma mark - 远程推送注册获得device Token
if (IOS_VERSION >= 10.0) {

    UNUserNotificationCenter * center = [UNUserNotificationCenter currentNotificationCenter];
    [center setDelegate:self];
    UNAuthorizationOptions type = UNAuthorizationOptionBadge | UNAuthorizationOptionSound |UNAuthorizationOptionAlert;

    [center requestAuthorizationWithOptions:type completionHandler:^(BOOL granted, NSError * _Nullable error) {

        if (granted) {
            NSLog(@"注册成功");
        }else{
            NSLog(@"注册失败");
        }

    }];

}else if (IOS_VERSION >= 8.0){

    UIUserNotificationType notificationTypes = UIUserNotificationTypeBadge | UIUserNotificationTypeSound |
UIUserNotificationTypeAlert;
    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:notificationTypes
categories:nil];
    [application registerUserNotificationSettings:settings];

}else{
    //ios8以下不适配了
}
// 注册获得device Token
[application registerForRemoteNotifications];

2、

#pragma mark - 远程推送注册获得device Token
// 将得到的deviceToken传给SDK
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    NSString *deviceTokenStr = [[[[deviceToken description]
                                 stringByReplacingOccurrencesOfString:@"<" withString:@""]
                                 stringByReplacingOccurrencesOfString:@">" withString:@""]
                                 stringByReplacingOccurrencesOfString:@" " withString:@""];

    NSLog(@"deviceTokenStr:\n%@",deviceTokenStr);
}

// 注册deviceToken失败
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
    NSLog(@"注册deviceToken失败error -- %@",error);
}

3、

#pragma mark - 远程推送消息的处理 - iOS10以后
//在前台
- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler
{
    // 需要执行这个方法，选择是否提醒用户，有Badge、Sound、Alert三种类型可以设置
    completionHandler(UNNotificationPresentationOptionBadge |
                      UNNotificationPresentationOptionSound |
                      UNNotificationPresentationOptionAlert);

}

//在后台、关闭状态
- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler
{
    //处理推送过来的数据
    NSLog(@"%@", response.notification.request.content.userInfo);
    completionHandler();
}

#pragma mark - 远程推送消息的处理 - iOS10之前
//在前台、在后台、关闭状态统一进入该方法
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary * _Nonnull)userInfo fetchCompletionHandler:(void (^ _Nonnull)(UIBackgroundFetchResult))completionHandler{

    /*
     UIApplicationStateActive 应用程序处于前台
     UIApplicationStateBackground 应用程序在后台，用户从通知中心点击消息将程序从后台调至前台
     UIApplicationStateInactive 用用程序处于关闭状态(不在前台也不在后台)，用户通过点击通知中心的消息将客户端从关闭状态调至前台
     */

    //应用程序在前台给一个提示特别消息
    if (application.applicationState == UIApplicationStateActive) {

        //应用程序在前台
        NSLog(@"应用程序在前台%@", userInfo);

    }else{

        //其他两种情况，一种在后台程序没有被杀死，另一种是在程序已经杀死。用户点击推送的消息进入app的情况处理。
        NSLog(@"应用程序在后台、关闭状态%@", userInfo);

    }

    completionHandler(UIBackgroundFetchResultNewData);

}