官方文档地址：非常详细，按步骤 so easy
http://docs.jpush.io/guideline/ios_guide/

极光默认的推送后台
https://www.jpush.cn/common/apps

• 1 开发者中心申请推送证书，并且需要 p12 文件
• 2 按文档说明导入必要文件与框架
• 3 复制代码

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

    // 注册 
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
        //可以添加自定义categories iOS8 新特性，例如快速回复
        [JPUSHService registerForRemoteNotificationTypes:(UIUserNotificationTypeBadge |
                                                          UIUserNotificationTypeSound |
                                                          UIUserNotificationTypeAlert)
                                              categories:nil];
    } else {
        //categories 必须为nil
        [JPUSHService registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge |
                                                          UIRemoteNotificationTypeSound |
                                                          UIRemoteNotificationTypeAlert)
                                              categories:nil];
    }
    
    [JPUSHService setupWithOption:launchOptions appKey:@"appkey"
                          channel:@"appstore"
                 apsForProduction:NO // 如果为开发状态,设置为 NO; 如果为生产状态,应改为 YES.
            advertisingIdentifier:nil];// 广告 不用设置为nil
    return YES;
}

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    /// Required - 注册 DeviceToken
    [JPUSHService registerDeviceToken:deviceToken];
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    // 收到通知就触发
    [JPUSHService handleRemoteNotification:userInfo];
    completionHandler(UIBackgroundFetchResultNewData);
    [JPUSHService resetBadge]; // 重置 脚标
    // 处理 userinfo
}

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    // error 处理
}

• 4 其他高级功能好像并不是很多用

• 5 如果需要，可以研究以下 iOS8 的新特性 UIUserNotificationSettings 对通知的便捷操作。

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