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* ASViewController can be used without a node - If a node isn't provided by developers via -initWithNode:, a default one will be created and used internally. - This allows developers to use ASViewController like a normal UIViewController and as a base class for all view controllers among which some use a node hierarchy and some don't. * Update ASDKgram to use a shared base ASViewController * Minor fixes in ASViewController: - If its node isn't provided by users, don't replace the view controller's view with the default node's view because it might be loaded from a nib. - Init a vanilla ASDisplayNode if a node isn't provided. * Some smaller cleanup * Remove dummy node for ASViewController if it’s used without a node
124 lines
3.5 KiB
Objective-C
124 lines
3.5 KiB
Objective-C
//
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// PhotoFeedNodeController.m
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// Sample
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//
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// Created by Hannah Troisi on 2/17/16.
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#import "PhotoFeedNodeController.h"
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#import <AsyncDisplayKit/AsyncDisplayKit.h>
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#import "Utilities.h"
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#import "PhotoModel.h"
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#import "PhotoCellNode.h"
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#import "PhotoFeedModel.h"
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#define AUTO_TAIL_LOADING_NUM_SCREENFULS 2.5
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@interface PhotoFeedNodeController () <ASTableDelegate, ASTableDataSource>
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@end
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@implementation PhotoFeedNodeController
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{
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ASTableNode *_tableNode;
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}
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#pragma mark - Lifecycle
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// -init is often called off the main thread in ASDK. Therefore it is imperative that no UIKit objects are accessed.
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// Examples of common errors include accessing the node’s view or creating a gesture recognizer.
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- (instancetype)init
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{
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_tableNode = [[ASTableNode alloc] init];
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self = [super initWithNode:_tableNode];
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if (self) {
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self.navigationItem.title = @"ASDK";
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[self.navigationController setNavigationBarHidden:YES];
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_tableNode.dataSource = self;
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_tableNode.delegate = self;
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}
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return self;
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}
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// -loadView is guaranteed to be called on the main thread and is the appropriate place to
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// set up an UIKit objects you may be using.
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- (void)loadView
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{
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[super loadView];
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_tableNode.view.leadingScreensForBatching = AUTO_TAIL_LOADING_NUM_SCREENFULS; // overriding default of 2.0
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}
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- (void)loadPageWithContext:(ASBatchContext *)context
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{
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[self.photoFeed requestPageWithCompletionBlock:^(NSArray *newPhotos){
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[self insertNewRows:newPhotos];
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[self requestCommentsForPhotos:newPhotos];
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if (context) {
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[context completeBatchFetching:YES];
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}
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} numResultsToReturn:20];
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}
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#pragma mark - Subclassing
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- (UITableView *)tableView
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{
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return _tableNode.view;
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}
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- (void)loadPage
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{
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[self loadPageWithContext:nil];
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}
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- (void)requestCommentsForPhotos:(NSArray *)newPhotos
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{
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// Do nothing (#1530).
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}
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#pragma mark - ASTableDataSource methods
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- (NSInteger)tableNode:(ASTableNode *)tableNode numberOfRowsInSection:(NSInteger)section
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{
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return [self.photoFeed numberOfItemsInFeed];
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}
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- (ASCellNodeBlock)tableNode:(ASTableNode *)tableNode nodeBlockForRowAtIndexPath:(NSIndexPath *)indexPath
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{
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PhotoModel *photoModel = [self.photoFeed objectAtIndex:indexPath.row];
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// this will be executed on a background thread - important to make sure it's thread safe
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ASCellNode *(^ASCellNodeBlock)() = ^ASCellNode *() {
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PhotoCellNode *cellNode = [[PhotoCellNode alloc] initWithPhotoObject:photoModel];
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return cellNode;
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};
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return ASCellNodeBlock;
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}
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#pragma mark - ASTableDelegate methods
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// Receive a message that the tableView is near the end of its data set and more data should be fetched if necessary.
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- (void)tableNode:(ASTableNode *)tableNode willBeginBatchFetchWithContext:(ASBatchContext *)context
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{
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[context beginBatchFetching];
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[self loadPageWithContext:context];
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}
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@end
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