Merge pull request lxcid#81 from lxcid/bug/80-cleanup-gestures

Bug/80 cleanup gestures

Author: lxcid

LXReorderableCollectionViewFlowLayout/LXReorderableCollectionViewFlowLayout.m

@@ -107,6 +107,30 @@ - (void)setupCollectionView {
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleApplicationWillResignActive:) name: UIApplicationWillResignActiveNotification object:nil];
 }
 
+- (void)tearDownCollectionView {
+    // Tear down long press gesture
+    if (_longPressGestureRecognizer) {
+        UIView *view = _longPressGestureRecognizer.view;
+        if (view) {
+            [view removeGestureRecognizer:_longPressGestureRecognizer];
+        }
+        _longPressGestureRecognizer.delegate = nil;
+        _longPressGestureRecognizer = nil;
+    }
+    
+    // Tear down pan gesture
+    if (_panGestureRecognizer) {
+        UIView *view = _panGestureRecognizer.view;
+        if (view) {
+            [view removeGestureRecognizer:_panGestureRecognizer];
+        }
+        _panGestureRecognizer.delegate = nil;
+        _panGestureRecognizer = nil;
+    }
+    
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
+}
+
 - (id)init {
     self = [super init];
     if (self) {
@@ -127,8 +151,8 @@ - (id)initWithCoder:(NSCoder *)aDecoder {
 
 - (void)dealloc {
     [self invalidatesScrollTimer];
+    [self tearDownCollectionView];
     [self removeObserver:self forKeyPath:kLXCollectionViewKeyPath];
-    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
 }
 
 - (void)applyLayoutAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes {
@@ -490,6 +514,7 @@ - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(N
             [self setupCollectionView];
         } else {
             [self invalidatesScrollTimer];
+            [self tearDownCollectionView];
         }
     }
 }