Disable asyncDataFetching in ASTableView and ASCollectionView init methods.

It's currently unreliable for some use cases that issue editing calls while
content is displayed or being interacted with.  The performance gain is not
sufficient to sacrifice correctness for the clients that hit this issue,
so it will remain off until fully resolved.

Author: appleguy

AsyncDisplayKit/ASCollectionView.mm

@@ -136,6 +136,10 @@ - (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionVi
 {
   if (!(self = [super initWithFrame:frame collectionViewLayout:layout]))
     return nil;
+  
+  // FIXME: asyncDataFetching is currently unreliable for some use cases.
+  // https://github.com/facebook/AsyncDisplayKit/issues/385
+  asyncDataFetchingEnabled = NO;
 
   ASDisplayNodeAssert([layout isKindOfClass:UICollectionViewFlowLayout.class], @"only flow layouts are currently supported");
 
@@ -165,8 +169,10 @@ - (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionVi
   return self;
 }
 
--(void)dealloc {
-  // a little defense move here.
+- (void)dealloc
+{
+  // Sometimes the UIKit classes can call back to their delegate even during deallocation.
+  // This bug might be iOS 7-specific.
   super.delegate  = nil;
   super.dataSource = nil;
 }

AsyncDisplayKit/ASTableView.mm

@@ -157,7 +157,8 @@ void ASPerformBlockWithoutAnimation(BOOL withoutAnimation, void (^block)()) {
 #pragma mark -
 #pragma mark Lifecycle
 
-- (void)configureWithAsyncDataFetching:(BOOL)asyncDataFetchingEnabled {
+- (void)configureWithAsyncDataFetching:(BOOL)asyncDataFetchingEnabled
+{
   _layoutController = [[ASFlowLayoutController alloc] initWithScrollOption:ASFlowLayoutDirectionVertical];
 
   _rangeController = [[ASRangeController alloc] init];
@@ -185,12 +186,17 @@ - (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style asyncD
   if (!(self = [super initWithFrame:frame style:style]))
     return nil;
 
+  // FIXME: asyncDataFetching is currently unreliable for some use cases.
+  // https://github.com/facebook/AsyncDisplayKit/issues/385
+  asyncDataFetchingEnabled = NO;
+  
   [self configureWithAsyncDataFetching:asyncDataFetchingEnabled];
 
   return self;
 }
 
-- (instancetype)initWithCoder:(NSCoder *)aDecoder {
+- (instancetype)initWithCoder:(NSCoder *)aDecoder
+{
   if (!(self = [super initWithCoder:aDecoder]))
     return nil;
 
@@ -199,8 +205,10 @@ - (instancetype)initWithCoder:(NSCoder *)aDecoder {
   return self;
 }
 
--(void)dealloc {
-  // a little defense move here.
+- (void)dealloc
+{
+  // Sometimes the UIKit classes can call back to their delegate even during deallocation.
+  // This bug might be iOS 7-specific.
   super.delegate  = nil;
   super.dataSource = nil;
 }