什么是UIApplicationLaunchOptionsRemoteNotificationKey用于？

Question

如果我理解正确，UIApplicationLaunchOptionsRemoteNotificationKey方法会在-[UIApplicationDelegate application:didFinishLaunchingWithOptions:]方法上使用 - 当应用程序未运行（例如已杀死）时收到推送 - 用户点击了收到的推送

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    NSDictionary *userInfo = launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey];
    if(userInfo) {
        // app was not running and the user clicked on the push
    }
}

但..在完全相同的情况下，-[AppDelegate application:didReceiveRemoteNotification:fetchCompletionHandler:]也会在前一个之后调用。

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler
{
    // called when
    // app was not running and the user clicked on the push
    // app was running in background and user clicked on a push
    // app was running in background and a silent push was received
    // app is in foreground and a push is received
    completionHandler(UIBackgroundFetchResultNewData);
}

所以问题是，如果可以在UIApplicationLaunchOptionsRemoteNotificationKey代理中处理所有内容，为什么要使用application:didReceiveRemoteNotification:fetchCompletionHandler？我错过了什么吗？

欢呼声，

扬

Answer 1

如果应用程序被终止且用户点击通知中心的推送通知，则launchingOptions字典包含UIApplicationLaunchOptionsRemoteNotificationKey，以便您可以调整应用启动逻辑。 在以前的iOS版本中，来自application:didReceiveRemoteNotification: fetchCompletionHandler:的{​​{1}}和launchingOptions词典是唯一可以在应用启动时处理远程通知的地方。

我的猜测是application:didFinishLaunchingWithOptions:出于兼容性原因包含UIApplicationLaunchOptionsRemoteNotificationKey。

Answer 2

此键的存在表示可以让应用程序处理远程通知。此键的值是包含远程通知的有效负载的NSDictionary。