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

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

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

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+//
+//  PhotoFeedListKitViewController.m
+//  Texture
+//
+//  Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import "PhotoFeedListKitViewController.h"
+#import <IGListKit/IGListKit.h>
+#import "PhotoFeedModel.h"
+#import "PhotoFeedSectionController.h"
+#import "RefreshingSectionControllerType.h"
+
+@interface PhotoFeedListKitViewController () <IGListAdapterDataSource, ASCollectionDelegate>
+@property (nonatomic, strong) IGListAdapter *listAdapter;
+@property (nonatomic, strong) PhotoFeedModel *photoFeed;
+@property (nonatomic, strong, readonly) ASCollectionNode *collectionNode;
+@property (nonatomic, strong, readonly) UIActivityIndicatorView *spinner;
+@property (nonatomic, strong, readonly) UIRefreshControl *refreshCtrl;
+@end
+
+@implementation PhotoFeedListKitViewController
+@synthesize spinner = _spinner;
+
+- (instancetype)init
+{
+  UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
+  ASCollectionNode *node = [[ASCollectionNode alloc] initWithCollectionViewLayout:layout];
+  if (self = [super initWithNode:node]) {
+    self.navigationItem.title = @"ListKit";
+
+    CGRect screenRect   = [[UIScreen mainScreen] bounds];
+    CGFloat screenScale = [[UIScreen mainScreen] scale];
+    CGSize screenWidthImageSize = CGSizeMake(screenRect.size.width * screenScale, screenRect.size.width * screenScale);
+    _photoFeed = [[PhotoFeedModel alloc] initWithPhotoFeedModelType:PhotoFeedModelTypePopular imageSize:screenWidthImageSize];
+
+    IGListAdapterUpdater *updater = [[IGListAdapterUpdater alloc] init];
+    _listAdapter = [[IGListAdapter alloc] initWithUpdater:updater viewController:self workingRangeSize:0];
+    _listAdapter.dataSource = self;
+    [_listAdapter setASDKCollectionNode:self.collectionNode];
+  }
+  return self;
+}
+
+- (void)viewDidLoad
+{
+  [super viewDidLoad];
+  self.collectionNode.view.alwaysBounceVertical = YES;
+  _refreshCtrl = [[UIRefreshControl alloc] init];
+  [_refreshCtrl addTarget:self action:@selector(refreshFeed) forControlEvents:UIControlEventValueChanged];
+  [self.collectionNode.view addSubview:_refreshCtrl];
+  _spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+}
+
+- (ASCollectionNode *)collectionNode
+{
+  return self.node;
+}
+
+- (void)resetAllData
+{
+  // nop, not used currently
+}
+
+- (void)refreshFeed
+{
+  // Ask the first section controller to do the refreshing.
+  id<RefreshingSectionControllerType> secCtrl = [self.listAdapter sectionControllerForObject:self.photoFeed];
+  if ([(NSObject*)secCtrl conformsToProtocol:@protocol(RefreshingSectionControllerType)]) {
+    [secCtrl refreshContentWithCompletion:^{
+      [self.refreshCtrl endRefreshing];
+    }];
+  }
+}
+
+- (UIActivityIndicatorView *)spinner
+{
+  if (_spinner == nil) {
+    _spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+    [_spinner startAnimating];
+  }
+  return _spinner;
+}
+
+- (UIStatusBarStyle)preferredStatusBarStyle
+{
+  return UIStatusBarStyleLightContent;
+}
+
+- (BOOL)prefersStatusBarHidden
+{
+  return NO;
+}
+
+#pragma mark - IGListAdapterDataSource
+
+- (NSArray<id <IGListDiffable>> *)objectsForListAdapter:(IGListAdapter *)listAdapter
+{
+  return @[ self.photoFeed ];
+}
+
+- (UIView *)emptyViewForListAdapter:(IGListAdapter *)listAdapter
+{
+  return self.spinner;
+}
+
+- (IGListSectionController *)listAdapter:(IGListAdapter *)listAdapter sectionControllerForObject:(id)object
+{
+  if ([object isKindOfClass:[PhotoFeedModel class]]) {
+    return [[PhotoFeedSectionController alloc] init];
+  } else {
+    ASDisplayNodeFailAssert(@"Only supports objects of class PhotoFeedModel.");
+    return nil;
+  }
+}
+
+@end