components/Chips/examples/ChipsCustomizedExampleViewController.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 "ChipsExamplesSupplemental.h"

#import "MaterialChips.h"

@implementation ChipsCustomizedExampleViewController {
  UICollectionView *_collectionView;
  MDCChipView *_sizingChip;
}

+ (void)configureChip:(MDCChipView *)chip {
  UIFont *customTitleFont = [UIFont fontWithName:@"ChalkDuster" size:14.0f];
  chip.titleFont = customTitleFont;

  UIColor *customColor = [UIColor blueColor];
  [chip setTitleColor:customColor forState:UIControlStateNormal];
  [chip setBorderColor:customColor forState:UIControlStateNormal];
  [chip setBorderWidth:2.0f forState:UIControlStateNormal];
  [chip setInkColor:[customColor colorWithAlphaComponent:0.2f] forState:UIControlStateNormal];

  UIColor *customSelectedColor = [UIColor orangeColor];
  [chip setTitleColor:customSelectedColor forState:UIControlStateSelected];
  [chip setBorderColor:customSelectedColor forState:UIControlStateSelected];
  [chip setBorderWidth:4.0f forState:UIControlStateSelected];
  [chip setInkColor:[customSelectedColor colorWithAlphaComponent:0.2f]
           forState:UIControlStateSelected];
  [chip setInkColor:[customSelectedColor colorWithAlphaComponent:0.2f]
           forState:UIControlStateSelected|UIControlStateHighlighted];
}

- (void)loadView {
  [super loadView];

  MDCChipCollectionViewFlowLayout *layout = [[MDCChipCollectionViewFlowLayout alloc] init];
  layout.minimumInteritemSpacing = 10;

  _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
  _collectionView.dataSource = self;
  _collectionView.delegate = self;
  _collectionView.allowsMultipleSelection = YES;
  _collectionView.backgroundColor = [UIColor whiteColor];
  _collectionView.delaysContentTouches = NO;
  _collectionView.contentInset = UIEdgeInsetsMake(4, 8, 4, 8);
  [_collectionView registerClass:[MDCChipCollectionViewCell class]
      forCellWithReuseIdentifier:@"MDCChipCollectionViewCell"];

  _sizingChip = [[MDCChipView alloc] init];
  [[self class] configureChip:_sizingChip];

  [self.view addSubview:_collectionView];
}

- (void)viewWillLayoutSubviews {
  [super viewWillLayoutSubviews];

  _collectionView.frame = self.view.bounds;
}

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

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                           cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCChipCollectionViewCell *cell =
      [collectionView dequeueReusableCellWithReuseIdentifier:@"MDCChipCollectionViewCell"
                                                forIndexPath:indexPath];

  [[self class] configureChip:cell.chipView];
  cell.chipView.titleLabel.text = self.titles[indexPath.row];
  cell.chipView.selectedImageView.image = [self doneImage];
  cell.alwaysAnimateResize = YES;

  return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView
                  layout:(UICollectionViewLayout*)collectionViewLayout
  sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
  NSArray *selectedPaths = [collectionView indexPathsForSelectedItems];
  _sizingChip.selected = [selectedPaths containsObject:indexPath];
  _sizingChip.titleLabel.text = self.titles[indexPath.row];
  _sizingChip.selectedImageView.image = [self doneImage];
  return [_sizingChip sizeThatFits:collectionView.bounds.size];
}

- (void)collectionView:(UICollectionView *)collectionView
    didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
  [collectionView performBatchUpdates:nil completion:nil];
}

- (void)collectionView:(UICollectionView *)collectionView
    didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
  [collectionView performBatchUpdates:nil completion:nil];
}

- (NSArray *)titles {
  if (!_titles) {
    _titles = @[
      @"Doorman",
      @"Elevator",
      @"Garage Parking",
      @"Gym",
      @"Laundry in Building",
      @"Green Building",
      @"Parking Available",
      @"Pets Allowed",
      @"Pied-a-Terre Allowed",
      @"Swimming Pool",
      @"Smoke-free",
    ];
  }
  return _titles;
}

@end