material-components_material-components-ios/components/Collections/examples/CollectionsInlayExample.m

// Copyright 2016-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import "supplemental/CollectionsInlayExample.h"
#import "MaterialCollections.h"

static NSString *const kReusableIdentifierItem = @"itemCellIdentifier";

@implementation CollectionsInlayExample {
  NSArray *_colors;
}

- (void)viewDidLoad {
  [super viewDidLoad];

  _colors = @[ @"red", @"blue", @"green", @"black", @"yellow", @"purple" ];

  // Register cell class.
  [self.collectionView registerClass:[MDCCollectionViewTextCell class]
          forCellWithReuseIdentifier:kReusableIdentifierItem];

  // Customize collection view settings.
  self.styler.cellStyle = MDCCollectionViewCellStyleCard;
  self.styler.allowsItemInlay = YES;
  self.styler.allowsMultipleItemInlays = YES;
}

#pragma mark - <UICollectionViewDataSource>

- (NSInteger)collectionView:(UICollectionView *)collectionView
     numberOfItemsInSection:(NSInteger)section {
  return _colors.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                  cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCCollectionViewTextCell *cell =
      [collectionView dequeueReusableCellWithReuseIdentifier:kReusableIdentifierItem
                                                forIndexPath:indexPath];
  cell.textLabel.text = _colors[indexPath.item];
  return cell;
}

#pragma mark - <UICollectionViewDelegate>

- (void)collectionView:(UICollectionView *)collectionView
    didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
  BOOL isInlaid = [self.styler isItemInlaidAtIndexPath:indexPath];
  if (isInlaid) {
    [self.styler removeInlayFromItemAtIndexPath:indexPath animated:YES];
  } else {
    [self.styler applyInlayToItemAtIndexPath:indexPath animated:YES];
  }
}

#pragma mark - CatalogByConvention

+ (NSDictionary *)catalogMetadata {
  return @{
    @"breadcrumbs" : @[ @"Collections", @"Cell Inlay Example" ],
    @"primaryDemo" : @NO,
    @"presentable" : @NO,
  };
}

@end