components/CollectionCells/examples/CollectionCellsTextExample.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 "CollectionCellsTextExample.h"

#import "MaterialTypography.h"

static NSString *const kReusableIdentifierItem = @"itemCellIdentifier";
static NSString *const kExampleDetailText =
    @"Pellentesque non quam ornare, porta urna sed, malesuada felis. Praesent at gravida felis, "
     "non facilisis enim. Proin dapibus laoreet lorem, in viverra leo dapibus a.";

@implementation CollectionCellsTextExample {
  NSMutableArray *_content;
}

+ (NSArray *)catalogBreadcrumbs {
  return @[ @"Collection Cells", @"Cell Text Example" ];
}

+ (BOOL)catalogIsPrimaryDemo {
  return YES;
}

+ (NSString *)catalogDescription {
  return @"Material Collection Cells enables a native collection view cell to have Material "
          "design layout and styling. It also provides editing and extensive customization "
          "capabilities.";
}

- (void)viewDidLoad {
  [super viewDidLoad];

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

  // Populate content with array of text, details text, and number of lines.
  _content = [NSMutableArray array];
  [_content addObject:@[ @"Single line text", @"", @(MDCCellDefaultOneLineHeight) ]];
  [_content addObject:@[ @"", @"Single line detail text", @(MDCCellDefaultOneLineHeight) ]];
  [_content
      addObject:@[ @"Two line text", @"Here is the detail text", @(MDCCellDefaultTwoLineHeight) ]];
  [_content addObject:@[
    @"Two line text (truncated)", kExampleDetailText, @(MDCCellDefaultTwoLineHeight)
  ]];
  [_content addObject:@[
    @"Three line text (wrapped)", kExampleDetailText, @(MDCCellDefaultThreeLineHeight)
  ]];
}

#pragma mark - <UICollectionViewDataSource>

- (NSInteger)collectionView:(UICollectionView *)collectionView
     numberOfItemsInSection:(NSInteger)section {
  return [_content count];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                  cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCCollectionViewTextCell *cell =
      [collectionView dequeueReusableCellWithReuseIdentifier:kReusableIdentifierItem
                                                forIndexPath:indexPath];
  cell.textLabel.text = _content[indexPath.item][0];
  cell.detailTextLabel.text = _content[indexPath.item][1];

  if (indexPath.item == 4) {
    cell.detailTextLabel.numberOfLines = 2;
  }
  return cell;
}

#pragma mark - <MDCCollectionViewStylingDelegate>

- (CGFloat)collectionView:(UICollectionView *)collectionView
    cellHeightAtIndexPath:(NSIndexPath *)indexPath {
  return [_content[indexPath.item][2] integerValue];
}

@end