iPhone应用程序如何解决应用程序关闭时计时器暂停的问题？
目前我正在使用计时器来执行计算，然后每秒更新一个标签，但是一旦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看来计时器还没有停止？
--- 目前试图记录应用程序停止然后重新打开的时间，这些值之间的差异并将差异添加到标签中，但没有运气:(
感谢任何帮助！
at the moment i am using a timer to perform a calculation and then update a label every second but once the iphone app is sent to the background the timer pauses and then resumes upon re-opening... what are my options to get around this so that it seems the timer has not stopped ??
--- at the moment trying to record the time in which the app stops and then reopens, that the difference between those values and add the difference to the label but having no luck :(
ANY HELP IS APPRECIATED !!!
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当应用程序移至后台时（即您的应用程序委托收到
applicationDidEnterBackground:消息，或者您收到UIApplicationDidEnterBackgroundNotification通知），只需停止计时器即可。如有必要，请保存当前时间。然后，当应用程序移动到前台时（即您的应用程序委托收到
applicationWillEnterForeground:消息，或者您收到UIApplicationWillEnterForegroundNotification通知），从当前的标签值重新计算时间，然后重新启动计时器。When the app moves to the background (i.e. your app delegate gets the
applicationDidEnterBackground:message, or you receive aUIApplicationDidEnterBackgroundNotificationnotification), just stop the timer. And save the current time, if necessary.Then when the app is moving to the foreground (i.e. your app delegate gets the
applicationWillEnterForeground:message, or you receive aUIApplicationWillEnterForegroundNotificationnotification), recalculate the the label value from the current time and then restart the timer.