material-components_material-components-ios/components/Collections/examples/CollectionsCellAccessoryExample.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/CollectionsCellAccessoryExample.h"

static NSString *const kReusableIdentifierItem = @"itemCellIdentifier";

@implementation CollectionsCellAccessoryExample {
  NSArray *_accessoryTypes;
  NSMutableArray <NSArray *>*_content;
}

- (void)viewDidLoad {
  [super viewDidLoad];

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

  // Array of available accessory types.
  _accessoryTypes = @[
    @(MDCCollectionViewCellAccessoryDisclosureIndicator),
    @(MDCCollectionViewCellAccessoryCheckmark), @(MDCCollectionViewCellAccessoryDetailButton),
    @(MDCCollectionViewCellAccessoryNone), @(MDCCollectionViewCellAccessoryNone)
  ];

  // Populate content.
  _content = [NSMutableArray array];
  [_content addObject:@[ @"Enable Editing" ]];
  [_content addObject:@[
    @"Disclosure Indicator", @"Checkmark", @"Detail Button", @"Custom Accessory View",
    @"No Accessory View"
  ]];

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

#pragma mark - <UICollectionViewDataSource>

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

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

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

  // Add accessory views.
  if (indexPath.section == 0) {
    // Add switch as accessory view.
    UISwitch *editingSwitch = [[UISwitch alloc] initWithFrame:CGRectZero];
    [editingSwitch addTarget:self
                      action:@selector(didSwitch:)
            forControlEvents:UIControlEventValueChanged];
    cell.accessoryView = editingSwitch;
  } else {
    cell.accessoryType = [_accessoryTypes[indexPath.item] unsignedIntegerValue];
  }

  return cell;
}

#pragma mark - <MDCCollectionViewEditingDelegate>

- (BOOL)collectionViewAllowsEditing:(UICollectionView *)collectionView {
  return NO;
}

- (BOOL)collectionViewAllowsReordering:(UICollectionView *)collectionView {
  return NO;
}

- (BOOL)collectionView:(UICollectionView *)collectionView
    canEditItemAtIndexPath:(NSIndexPath *)indexPath {
  return (indexPath.section != 0);
}

- (BOOL)collectionView:(UICollectionView *)collectionView
    canMoveItemAtIndexPath:(NSIndexPath *)indexPath {
  return (indexPath.section != 0);
}

#pragma mark - UIControlEvents

- (void)didSwitch:(id)sender {
  UISwitch *switchControl = sender;
  [self.editor setEditing:switchControl.isOn animated:YES];
}

#pragma mark - CatalogByConvention

+ (NSArray *)catalogBreadcrumbs {
  return @[ @"Collections", @"Cell Accessory Example" ];
}

+ (BOOL)catalogIsPrimaryDemo {
  return NO;
}

+ (BOOL)catalogIsPresentable {
  return YES;
}

@end