iOS 远程推送概念相关准备工作代码实现：（前提：确保bundleID和网站的配置一样）AppDelegate中的全部代码

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken;

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo;

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 设置要注册的通知类型，iOS8以后配置授权
    if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
        UIUserNotificationType type = UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert;
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:type categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
    } else {
        // 如果是iOS8以前，设置要注册的通知类型
        UIRemoteNotificationType type = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert;
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:type];
    }

     // iOS7之前，如退出程序后接收到推送，想要处理获取通知后的事件要在下面代码中
    if (launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey]) {
        // 获取到通知对象, 进行处理
        NSDictionary *userInfo = launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey][@"userInfo"];
        // 退出程序测试方法，真正接收到了通知就在界面上创建一个红色的View（控制台无法打印）
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 375, 200)];
        label.text = userInfo.description;
        label.numberOfLines = 0;
        [self.window.rootViewController.view addSubview:label];
    }
    return YES;
}

#pragma mark 远程推送注册完毕, 服务器返回Token时, 调用此方法
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    // 将来要在这里将Token 发送给自己的服务器做保存
    NSLog(@"deviceToken: %@", deviceToken);
}

#pragma mark 接收到远程推送的消息时调用此方法（后台和前台时可用）
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    // 记得要判断用户是否在前台
    if (application.applicationState == UIApplicationStateActive) {
        NSLog(@"不要自动跳转/ 给用户提示");
        return ;
    }
    // 将来需要取消角标的数字, 是根据用户是否做了某些操作, 来更改数字角标的值
    // 获取推送的值
    NSInteger count = [userInfo[@"aps"][@"badge"] intValue];
    // 设置相关的属性
    application.applicationIconBadgeNumber = count;
}

#pragma mark 接收到远程推送的消息时调用此方法（前、后、退出都可用，iOS7以后可用）
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    // 测试添加一个label表示接收到通知
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 375, 200)];
    label.text = userInfo.description;
    label.numberOfLines = 0;
    [self.window.rootViewController.view addSubview:label];
    // 不调用该block会报错
    completionHandler(UIBackgroundFetchResultNewData);
}