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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
3.8 KiB
Objective-C
124 lines
3.8 KiB
Objective-C
//
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// PhotoFeedBaseController.m
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// Sample
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//
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// Created by Huy Nguyen on 20/12/16.
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// Copyright © 2016 Facebook. All rights reserved.
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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 "PhotoFeedBaseController.h"
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#import "PhotoFeedModel.h"
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@implementation PhotoFeedBaseController
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{
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UIActivityIndicatorView *_activityIndicatorView;
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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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_activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
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_photoFeed = [[PhotoFeedModel alloc] initWithPhotoFeedModelType:PhotoFeedModelTypePopular imageSize:[self imageSizeForScreenWidth]];
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[self refreshFeed];
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CGSize boundSize = self.view.bounds.size;
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[_activityIndicatorView sizeToFit];
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CGRect refreshRect = _activityIndicatorView.frame;
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refreshRect.origin = CGPointMake((boundSize.width - _activityIndicatorView.frame.size.width) / 2.0,
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(boundSize.height - _activityIndicatorView.frame.size.height) / 2.0);
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_activityIndicatorView.frame = refreshRect;
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[self.view addSubview:_activityIndicatorView];
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self.tableView.allowsSelection = NO;
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self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
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self.view.backgroundColor = [UIColor whiteColor];
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}
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- (void)refreshFeed
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{
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[_activityIndicatorView startAnimating];
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// small first batch
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[_photoFeed refreshFeedWithCompletionBlock:^(NSArray *newPhotos){
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[_activityIndicatorView stopAnimating];
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[self insertNewRows:newPhotos];
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[self requestCommentsForPhotos:newPhotos];
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// immediately start second larger fetch
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[self loadPage];
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} numResultsToReturn:4];
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}
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- (void)insertNewRows:(NSArray *)newPhotos
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{
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NSInteger section = 0;
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NSMutableArray *indexPaths = [NSMutableArray array];
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NSInteger newTotalNumberOfPhotos = [_photoFeed numberOfItemsInFeed];
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for (NSInteger row = newTotalNumberOfPhotos - newPhotos.count; row < newTotalNumberOfPhotos; row++) {
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NSIndexPath *path = [NSIndexPath indexPathForRow:row inSection:section];
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[indexPaths addObject:path];
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}
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[self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
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}
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- (UIStatusBarStyle)preferredStatusBarStyle
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{
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return UIStatusBarStyleLightContent;
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}
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- (CGSize)imageSizeForScreenWidth
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{
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CGRect screenRect = [[UIScreen mainScreen] bounds];
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CGFloat screenScale = [[UIScreen mainScreen] scale];
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return CGSizeMake(screenRect.size.width * screenScale, screenRect.size.width * screenScale);
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}
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#pragma mark - PhotoFeedViewControllerProtocol
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- (void)resetAllData
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{
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[_photoFeed clearFeed];
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[self.tableView reloadData];
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[self refreshFeed];
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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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NSAssert(NO, @"Subclasses must override this method");
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return nil;
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}
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- (void)loadPage
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{
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NSAssert(NO, @"Subclasses must override this method");
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}
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- (void)requestCommentsForPhotos:(NSArray *)newPhotos
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{
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NSAssert(NO, @"Subclasses must override this method");
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}
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@end
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