iOS 12 前台通知shouldAlwaysAlertWhileAppIsForeground崩溃问题

iOS12后，前台通知中

shouldAlwaysAlertWhileAppIsForeground不能使用了，如果还是

 [content setValue:@(YES) forKeyPath:@"shouldAlwaysAlertWhileAppIsForeground"]则会崩溃

解决办法：

Appdelegate中添加：

//iOS 12
-(void) userNotificationCenter:(UNUserNotificationCenter*)center willPresentNotification:(UNNotification*)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler
{
    completionHandler(UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionSound);
}

创建前台通知时不设置

shouldAlwaysAlertWhileAppIsForeground属性。