iphone - 区分应用程序启动和应用程序唤醒

Question

我需要能够区分应用程序 didFinishLaunching 和应用程序进入后台并加载回前台。我注意到，如果我注册 UIApplicationDidBecomeActiveNotification，它在两个实例中都会被调用。我如何区分两者？

Answer 1

使用didFinishLaunchingWithOptionsvsapplicationWillEnterForeground来区分应用是冷启动还是从后台返回。

我尝试在我的一个应用程序中收听 UINotification，但通知传递得太晚了，所以我采取了直接收听这些方法调用的方法。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // only call when app is freshly launched
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // Only called when app is returning from background
}

Answer 2

我需要能够区分应用程序 didFinishLaunching

UIApplicationDidFinishLaunchingNotification

应用进入后台

UIApplicationDidEnterBackgroundNotification

被加载回前台

UIApplicationWillEnterForegroundNotification