Swiftgram/examples/ASDKgram/Sample/PhotoFeedNodeController.m
appleguy 465abb1ded [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses). (#1077)
* [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses)

With permission of the Facebook Open Source team, we are simplifying the Texture
license so that clients can rely on the Apache 2 terms that most of Texture is
already covered by. This means that code originally forked from AsyncDisplayKit
will be re-licensed from "BSD 3-clause + PATENTS v2" to Apache 2 without a
PATENTS file.

After getting confirmation that the updates to these core files look good, we'll
propagate this new license header to all files (in this same PR) and get sign-off
from all parties before landing.

* [License] Update all Texture source files to be pure Apache 2.

* Changelog entry for Apache 2 license update.

* Revert "[License] Update all Texture source files to be pure Apache 2."

This reverts commit ffa0fbbba9717d871dd16c4b07539f2f8208fc2b.

* [License] Update all Texture source files to be pure Apache 2, maintaining copyrights.

* [License] Update CONTRIBUTING, README, Podspec & Dangerfile.
2018-08-28 07:39:18 -07:00

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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 nodes 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