Add 'submodules/AsyncDisplayKit/' from commit '02bedc12816e251ad71777f9d2578329b6d2bef6'

git-subtree-dir: submodules/AsyncDisplayKit
git-subtree-mainline: d06f423e0e
git-subtree-split: 02bedc1281

submodules/AsyncDisplayKit/examples/ASDKgram/Sample/PhotoFeedNodeController.m

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+//
+//  PhotoFeedNodeController.m
+//  Texture
+//
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import "PhotoFeedNodeController.h"
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+#import "Utilities.h"
+#import "PhotoModel.h"
+#import "PhotoCellNode.h"
+#import "PhotoFeedModel.h"
+
+#define AUTO_TAIL_LOADING_NUM_SCREENFULS  2.5
+
+@interface PhotoFeedNodeController () <ASTableDelegate, ASTableDataSource>
+@property (nonatomic, strong) ASTableNode *tableNode;
+@end
+
+@implementation PhotoFeedNodeController
+
+#pragma mark - Lifecycle
+
+// -init is often called off the main thread in ASDK. Therefore it is imperative that no UIKit objects are accessed.
+// Examples of common errors include accessing the node’s view or creating a gesture recognizer.
+- (instancetype)init
+{
+  _tableNode = [[ASTableNode alloc] init];
+  self = [super initWithNode:_tableNode];
+
+  if (self) {
+    self.navigationItem.title = @"ASDK";
+    [self.navigationController setNavigationBarHidden:YES];
+
+    _tableNode.dataSource = self;
+    _tableNode.delegate = self;
+  }
+
+  return self;
+}
+
+// -loadView is guaranteed to be called on the main thread and is the appropriate place to
+// set up an UIKit objects you may be using.
+- (void)loadView
+{
+  [super loadView];
+
+  self.tableNode.leadingScreensForBatching = AUTO_TAIL_LOADING_NUM_SCREENFULS;  // overriding default of 2.0
+}
+
+- (void)loadPageWithContext:(ASBatchContext *)context
+{
+  [self.photoFeed requestPageWithCompletionBlock:^(NSArray *newPhotos){
+
+    [self insertNewRows:newPhotos];
+    if (context) {
+      [context completeBatchFetching:YES];
+    }
+  } numResultsToReturn:20];
+}
+
+#pragma mark - Subclassing
+
+- (UITableView *)tableView
+{
+  return _tableNode.view;
+}
+
+- (void)loadPage
+{
+  [self loadPageWithContext:nil];
+}
+
+#pragma mark - ASTableDataSource methods
+
+- (NSInteger)tableNode:(ASTableNode *)tableNode numberOfRowsInSection:(NSInteger)section
+{
+  return [self.photoFeed numberOfItemsInFeed];
+}
+
+- (ASCellNodeBlock)tableNode:(ASTableNode *)tableNode nodeBlockForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+  PhotoModel *photoModel = [self.photoFeed objectAtIndex:indexPath.row];
+  // this will be executed on a background thread - important to make sure it's thread safe
+  ASCellNode *(^ASCellNodeBlock)() = ^ASCellNode *() {
+    PhotoCellNode *cellNode = [[PhotoCellNode alloc] initWithPhotoObject:photoModel];
+    return cellNode;
+  };
+
+  return ASCellNodeBlock;
+}
+
+#pragma mark - ASTableDelegate methods
+
+// Receive a message that the tableView is near the end of its data set and more data should be fetched if necessary.
+- (void)tableNode:(ASTableNode *)tableNode willBeginBatchFetchWithContext:(ASBatchContext *)context
+{
+  [context beginBatchFetching];
+  [self loadPageWithContext:context];
+}
+
+@end