From 1c3327b03d93e9970aa22c8f4568daa08bdf6670 Mon Sep 17 00:00:00 2001
From: krizpoon <kriz@Poons-iMac.local>
Date: Thu, 18 Aug 2016 00:47:04 +0800
Subject: [PATCH] kvo cleanup

---
 Pod/Classes/OAStackView+Hiding.m | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Pod/Classes/OAStackView+Hiding.m b/Pod/Classes/OAStackView+Hiding.m
index f64467a..f60d2af 100644
--- a/Pod/Classes/OAStackView+Hiding.m
+++ b/Pod/Classes/OAStackView+Hiding.m
@@ -20,7 +20,11 @@ - (void)addObserverForView:(UIView*)view {
 }
 
 - (void)removeObserverForView:(UIView*)view {
-  [view removeObserver:self forKeyPath:@"hidden"];
+    @try {
+        [view removeObserver:self forKeyPath:@"hidden"];
+    } @catch (NSException * e) {
+        NSLog(@"OAStackView: Unable to remove observer for view %@: %@", view, e);
+    }
 }
 
 - (void)addObserverForViews:(NSArray*)views {
@@ -63,4 +67,10 @@ - (void)willRemoveSubview:(UIView *)subview {
   [self removeObserverForView:subview];
 }
 
+#pragma mark clean up
+
+- (void)dealloc {
+    [self removeObserverForViews:self.subviews];
+}
+
 @end