From 85a84dc5551d2182d69eff75b1efc2843c47dba5 Mon Sep 17 00:00:00 2001
From: xuhui <good122000@qq.com>
Date: Fri, 19 Aug 2016 15:23:33 +0800
Subject: [PATCH] fix the alert can not be showed when the frontmost
 viewController is begin dissmissed

---
 PSTAlertController/PSTAlertController.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/PSTAlertController/PSTAlertController.m b/PSTAlertController/PSTAlertController.m
index 489a75f..f1d23b0 100644
--- a/PSTAlertController/PSTAlertController.m
+++ b/PSTAlertController/PSTAlertController.m
@@ -287,6 +287,9 @@ - (void)showWithSender:(id)sender arrowDirection:(UIPopoverArrowDirection)arrowD
 
             // Use the frontmost viewController for presentation.
             while (controller.presentedViewController) {
+                if([controller.presentedViewController isBeingDismissed]) {
+                    break;
+                }
                 controller = controller.presentedViewController;
             }