iPhone:从前台/后台切换回来后重新加载 View ？

Question

这是针对具有多任务问题的 iOS4。当我的应用程序从后台运行的应用程序重新出现后，如何重新加载 View ？

Answer 1

您希望 View Controller 监听 UIApplicationWillEnterForegroundNotification :

Posted shortly before an application leaves the background state on its way to becoming the active application.

iOS Application Programming Guide中也提到了:

The UIApplicationWillEnterForegroundNotification notification is also available for tracking when your application reenters the foreground. Objects in your application can use the default notification center to register for this notification.

在此通知的处理程序中，您可以触发所需的任何刷新/重绘。

您可以在Cocoa Core Competencies中阅读有关通知的更多信息。文档。