ios - 开始监控重要位置变化并查询网络
<p><p>我编写了一个地理围栏 iOS 应用程序，它使用 startmonitoringsignificantlocationchanges 来触发需要网络查询的操作。它不能可靠地工作，因为有时网络延迟会导致应用程序终止。我确实意识到文档说，如果我尝试进行花费太长时间的网络查询，iOS 可能会终止应用程序:</p>
<blockquote>
<p>"If you leave this service running and your application is subsequently suspended or terminated, the service automatically wakes up your application when new location data arrives. At wake-up time, your application is put into the background and given a small amount of time to process the location data. Because your application is in the background, it should do minimal work and avoid any tasks (such as <strong>querying the network</strong>) that might prevent it from returning before the allocated time expires. If it does not, your application may be terminated." </p>
</blockquote>
<p>当 iOS 因进入区域而启动我的应用程序时，是否有另一种方法可以在后台启动网络查询？ </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>是的，您必须调用 beginBackgroundTaskWithExpirationHandler。见这里:</p>
<p> <a href="http://www.mindsizzlers.com/2011/07/ios-background-location/" rel="noreferrer noopener nofollow">http://www.mindsizzlers.com/2011/07/ios-background-location/</a> </p></p>
<p style="font-size: 20px;">关于ios - 开始监控重要位置变化并查询网络，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/19896245/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/19896245/
</a>
</p>
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