blocks|key|2833916|text|有办法处理这种情况：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2833917|使用推送通知，这是这种情况的最佳解决方案。|ordered-list-item|2833918|通过赋予用户设置应用程序设置时间间隔的能力，定期查询服务器。|2833919|当应用程序从背景到前台时，查询服务器。|2833920|2833921|2833922|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|O|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|P|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

There are ways to handle such kind of situation:

<ol>
<li>Use push notifications which is the best solution for such situation.</li>
<li>Query the server periodically by giving the ability to the user to set the time interval from app settings.</li>
<li>Query the server whenever the app came from background to foreground.</li>
</ol>

blocks|key|3259242|text|一个想法是在应用程序没有运行时使用BackgroundFetch更新它的内容。在我的一个应用程序中，我使用类似的fetch，在用户打开应用程序之前更新内容。我正在获取一个小的项目列表，它表明哪一项是最新的，哪些不是。然后，在运行时，我向用户提供了手动更新这些项的选项，但当然，您也可以在后台获取时下载所有这些内容。我的应用程序大部分时间都没有网络，当有一些互联网连接时，backgroundFetch会首先更新项目列表。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3259243|这里有两个您需要注册的重要方法，setMinimumBackgroundFetchInterval:和setMinimumBackgroundFetchInterval。您可以在苹果背景模式指南中阅读更多有关它们的信息。|3259244|您还可以查看有关此抓取功能的好教程：http://www.appcoda.com/ios7-background-fetch-programming/|offset|length|3259245|entityMap|0|LINK|mutability|MUTABLE|url|http://www.appcoda.com/ios7-background-fetch-programming/^0|0|0|I|1L|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

An idea is to use BackgroundFetch to update the app content while it is not running. I am using similar fetch for one of my apps where I update the content before the user opens the app. I am fetching a small list of items that is indicating which one is up to date and which is not. Then, at runtime I present an option to the user to manually update these items, but of course you can also download all that while in backgroundfetch. My app is without network reach most of the time, and backgroundFetch will update the items list first thing when there is some internet connection.

There are two important methods here that you need to register, setMinimumBackgroundFetchInterval: and application:performFetchWithCompletionHandler: . You can read more about them in Apples guides for background modes.

You can also check out this good tutorial about this fetching capability: <a href="http://www.appcoda.com/ios7-background-fetch-programming/" rel="nofollow">http://www.appcoda.com/ios7-background-fetch-programming/</a>

blocks|key|2834000|text|有一种最受欢迎的方式，因为大多数人更喜欢这种方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834001|在服务器端构建机制，它可以发送在特定日期/时间之后更新的图像列表。|unordered-list-item|2834002|若要跟踪上次本地同步日期/时间，请执行以下操作。|2834003|点击服务器上的最后一次日期/时间，如果第一次通过任何过去的日期和检查更新，如果有然后下载更新的图像，否则。|2834004|2834005|2834006|现在您必须决定什么时候要查询到服务器|offset|length|style|BOLD|2834007|1)每次应用程序都将加载。(在didFinishLaunchingWithOptions)。|CODE|2834008|(+2)定期查询服务器，使用户能够设置应用程序设置的时间间隔，或者在更好的位置设置时间间隔。|2834009|3)当应用程序从后台到前台时查询服务器。|2834010|entityMap^0|0|0|0|0|0|0|0|I|0|F|T|0|0|8|2|B|2|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|11|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|12|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|15|8|@$M|16|N|17|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|18|8|@$M|19|N|1A|O|S]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1B|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1C|8|@$M|1D|N|1E|O|P]|$M|1F|N|1G|O|P]]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|Y|$]]

There is way which has being most popular as most of peoples are preferring

<ul>
<li>At server side build mechanism, which can send lists of images updated after particular date/time. </li>
<li>To keep track of last sync date/time at locally.</li>
<li>Pinged on server with last date/time in case of first time pass any past date and check for update, if there is then download updated images, Otherwise. </li>
</ul>

Now you have to decide this process when would be query to server

1) At every first time application will be load. (At <code>didFinishLaunchingWithOptions</code>). 
2) Query the server periodically by giving the ability to the user to set the time interval from app settings or else where would be preferable. 
3) Query the server whenever the app came from background to foreground.

blocks|key|3259307|text|您可以定期与服务器同步数据，例如调用webservice检查图像是否已更改，然后获取新图像，如果图像未更改，则继续使用旧data.You在服务器端添加布尔值，该值可以告诉您服务器上的数据是否更新，或者您可以使用时间戳检查此值，比如上次更新数据时，然后将本地时间与更新数据的服务器时间进行比较。好运!！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3259308|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can sync your Data with server Periodically , like call a webservice which check if images have been changed then fetch the new images and if images are not changed then continue with old data.You can add a Boolean Value on server end which can tell you if data on server is updated or not or you can check this with Time stamp like when data is updated last time then compare your local time with Server time at which data has been updated . Good Luck !!

I am stuck to a point, I am managing my app offline also.. first time i get all data (images) from a webservices and store its path into sqlite, now I take an int value 0 or 1 and store its state into <code>NSUserDefaults</code> now I am facing problem in updating those images, like if images are changed how should I notify into my app, I searched it on Google and only solution is to send push notification to app when record is updated. What if user do not allow push notification?

Is there any other solution to manage app offline and update only when record is changed from online database?

Manage iPhone app both offline and online

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我被困住了，我也在离线管理我的应用程序。当我第一次从when服务中获取所有数据(图像)并将其路径存储到sqlite中时，现在我取一个int值0或1并将其状态存储到NSUserDefaults中，现在我在更新这些图像时遇到了问题，比如如果图像被更改了，我应该如何通知我的应用程序，我在Google上搜索它，唯一的解决方案是...

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