components/List/examples/MDCBaseCellExample.m

/*
 Copyright 2018-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 "MDCBaseCellExample.h"

#import "MDCBaseCell.h"

@implementation MDCBaseCellExample

- (void)viewDidLoad {
  [super viewDidLoad];
  self.parentViewController.automaticallyAdjustsScrollViewInsets = NO;
  self.automaticallyAdjustsScrollViewInsets = NO;
  [self createCollectionView];
}

-(void)viewWillLayoutSubviews {
  [super viewWillLayoutSubviews];
  [self positionCollectionView];
}

- (void)createCollectionView {
  self.collectionViewLayout = [[UICollectionViewFlowLayout alloc] init];
  self.collectionViewLayout.estimatedItemSize =
      CGSizeMake(self.collectionView.bounds.size.width - 20, kArbitraryCellHeight);
  self.collectionViewLayout.minimumInteritemSpacing = 5;
  self.collectionViewLayout.minimumLineSpacing = 5;
  self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds
                                           collectionViewLayout:self.collectionViewLayout];
  self.collectionView.backgroundColor = [UIColor whiteColor];
  [self.collectionView registerClass:[MDCBaseCell class]
          forCellWithReuseIdentifier:kBaseCellIdentifier];
  self.collectionView.delegate = self;
  self.collectionView.dataSource = self;
  self.numberOfCells = 100;
  [self.view addSubview:self.collectionView];
}

- (void)positionCollectionView {
  CGFloat originX = self.view.bounds.origin.x;
  CGFloat originY = self.view.bounds.origin.y;
  CGFloat width = self.view.bounds.size.width;
  CGFloat height = self.view.bounds.size.height;
#if defined(__IPHONE_11_0) && (__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_11_0)
  if (@available(iOS 11.0, *)) {
    originX += self.view.safeAreaInsets.left;
    originY += self.view.safeAreaInsets.top;
    width -= (self.view.safeAreaInsets.left + self.view.safeAreaInsets.right);
    height -= (self.view.safeAreaInsets.top + self.view.safeAreaInsets.bottom);
  }
#endif
  CGRect frame = CGRectMake(originX, originY, width, height);
  self.collectionView.frame = frame;
  self.collectionViewLayout.estimatedItemSize =
      CGSizeMake(self.collectionView.bounds.size.width - 20, kArbitraryCellHeight);
  [self.collectionViewLayout invalidateLayout];
  [self.collectionView reloadData];
}

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
  return 1;
}

-(NSInteger)collectionView:(UICollectionView *)collectionView
    numberOfItemsInSection:(NSInteger)section {
  return self.numberOfCells;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                 cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCBaseCell *cell =
      [collectionView dequeueReusableCellWithReuseIdentifier:kBaseCellIdentifier
                                                forIndexPath:indexPath];
  cell.layer.borderColor = [UIColor darkGrayColor].CGColor;
  cell.layer.borderWidth = 1;
  cell.inkColor = [UIColor colorWithRed:0 green:(CGFloat)0 blue:(CGFloat)0 alpha:(CGFloat)0.1];
  return cell;
}

-(void)collectionView:(UICollectionView *)collectionView
    didHighlightItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCBaseCell *cell = (MDCBaseCell *)[self.collectionView cellForItemAtIndexPath:indexPath];
  cell.elevation = 10;
}

-(void)collectionView:(UICollectionView *)collectionView
    didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCBaseCell *cell = (MDCBaseCell *)[self.collectionView cellForItemAtIndexPath:indexPath];
  cell.elevation = 0;
}

#pragma mark - CatalogByConvention

+ (NSArray *)catalogBreadcrumbs {
  return @[ @"List Items", @"MDCBaseCell Example" ];
}

+ (BOOL)catalogIsPrimaryDemo {
  return YES;
}

+ (NSString *)catalogDescription {
  return @"MDCBaseCell Example";
}

+ (BOOL)catalogIsPresentable {
  return YES;
}

+ (BOOL)catalogIsDebug {
  return NO;
}

@end