From 1420b532859ccd997ee86c17e1b6568c0ab5b8dc Mon Sep 17 00:00:00 2001
From: Sami Samhuri <sami@samhuri.net>
Date: Fri, 24 Apr 2015 22:39:04 -0700
Subject: [PATCH] clean up

---
 Blog/AppDelegate.m | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/Blog/AppDelegate.m b/Blog/AppDelegate.m
index f039032..c4a9671 100644
--- a/Blog/AppDelegate.m
+++ b/Blog/AppDelegate.m
@@ -103,14 +103,16 @@
 
 #pragma mark - UISplitViewDelegate methods
 
-- (BOOL)    splitViewController:(UISplitViewController *)splitViewController
-collapseSecondaryViewController:(UIViewController *)secondaryViewController
-      ontoPrimaryViewController:(UIViewController *)primaryViewController {
+id safeCast(id obj, __unsafe_unretained Class class) {
+    return [obj isKindOfClass:class] ? obj : nil;
+}
+
+- (BOOL) splitViewController:(UISplitViewController *)splitViewController collapseSecondaryViewController:(UIViewController *)secondaryViewController ontoPrimaryViewController:(UIViewController *)primaryViewController {
     UINavigationController *navigationController = [secondaryViewController isKindOfClass:[UINavigationController class]]
-                                                   ? (UINavigationController *)secondaryViewController : nil;
-    if ([navigationController
-            .topViewController isKindOfClass:[EditorViewController class]] && ([(EditorViewController *)navigationController
-            .topViewController post] == nil)) {
+                                                   ? (UINavigationController *)secondaryViewController
+                                                   : nil;
+    EditorViewController *editorViewController = navigationController.topViewController ? safeCast(navigationController.topViewController, [EditorViewController class]) : nil;
+    if (!editorViewController.post) {
         // Return YES to indicate that we have handled the collapse by doing nothing; the secondary controller will be discarded.
         return YES;
     }