目前，我正在使用计时器进行计算，然后每秒更新一个标签，但一旦iphone应用程序被发送到后台，计时器就会暂停，然后在重新打开时恢复。。。我有什么选择来解决这个问题，这样计时器似乎就没有停止？？
---在试图记录应用程序停止然后重新打开的时间时，这些值之间的差异并将差异添加到标签中，但没有运气：(
感谢您的帮助！！！
当应用程序移动到后台时（即，您的应用程序代表收到applicationDidEnterBackground:消息，或者您收到UIApplicationDidEnterBackgroundNotification通知），只需停止计时器。如有必要，请保存当前时间。
然后，当应用程序移动到前台时（即，您的应用程序代表收到applicationWillEnterForeground:消息，或者您收到UIApplicationWillEnterForegroundNotification通知），从当前时间重新计算标签值，然后重新启动计时器。
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