material-components_material-components-ios/components/CollectionCells/examples/CollectionCellsLayoutExample.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 "MaterialTypography.h"
#import "supplemental/CollectionCellsLayoutExample.h"

@interface SimpleModel : NSObject
@property(nonatomic, strong, nullable) NSString *text;
@property(nonatomic, strong, nullable) NSString *detailText;
@property(nonatomic) NSInteger textLines;
@property(nonatomic) NSInteger detailTextLines;
@property(nonatomic) BOOL checkMark;
@property(nonatomic) BOOL circle;
+ (instancetype)modelWithTextArray:(NSArray *)textArray
                     textLineArray:(NSArray *)textLineArray
                         checkMark:(BOOL)checkmark
                            circle:(BOOL)circle;
@end

@implementation SimpleModel
- (instancetype)initWithTextArray:(NSArray *)textArray
                    textLineArray:(NSArray *)textLineArray
                        checkMark:(BOOL)checkmark
                           circle:(BOOL)circle {
  self = [super init];
  if (self) {
    _text = textArray[0];
    _detailText = textArray[1];
    _textLines = [textLineArray[0] integerValue];
    _detailTextLines = [textLineArray[1] integerValue];
    _checkMark = checkmark;
    _circle = circle;
  }
  return self;
}

+ (instancetype)modelWithTextArray:(NSArray *)textArray
                     textLineArray:(NSArray *)textLineArray
                         checkMark:(BOOL)checkmark
                            circle:(BOOL)circle {
  return [[self alloc] initWithTextArray:textArray
                           textLineArray:textLineArray
                               checkMark:checkmark
                                  circle:circle];
}

@end

static NSString *const kReusableIdentifierItem = @"itemCellIdentifier";
static NSString *const kExampleText =
    @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris tempus, enim non tincidunt "
     "rhoncus, lacus sapien sagittis mi, id gravida risus turpis ut libero. ";
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.";

#define RGBCOLOR(r, g, b) \
  [UIColor colorWithRed:(r) / 255.0f green:(g) / 255.0f blue:(b) / 255.0f alpha:1]
#define HEXCOLOR(hex) RGBCOLOR((((hex) >> 16) & 0xFF), (((hex) >> 8) & 0xFF), ((hex)&0xFF))

@implementation CollectionCellsLayoutExample {
  NSMutableArray *_content;
}

- (void)viewDidLoad {
  [super viewDidLoad];

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

  // Populate content.
  _content = [NSMutableArray array];
  [_content addObject:[SimpleModel modelWithTextArray:@[ @"Show in Editing Mode", @"" ]
                                        textLineArray:@[ @(1), @(0) ]
                                            checkMark:NO
                                               circle:NO]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ @"Single line text", @"" ]
                                        textLineArray:@[ @(1), @(0) ]
                                            checkMark:NO
                                               circle:NO]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ kExampleText, @"" ]
                                        textLineArray:@[ @(2), @(0) ]
                                            checkMark:YES
                                               circle:NO]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ kExampleText, @"" ]
                                        textLineArray:@[ @(3), @(0) ]
                                            checkMark:NO
                                               circle:NO]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ @"", @"Detail text" ]
                                        textLineArray:@[ @(0), @(1) ]
                                            checkMark:NO
                                               circle:NO]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ kExampleText, kExampleDetailText ]
                                        textLineArray:@[ @(1), @(1) ]
                                            checkMark:NO
                                               circle:YES]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ kExampleText, kExampleDetailText ]
                                        textLineArray:@[ @(1), @(2) ]
                                            checkMark:NO
                                               circle:YES]];
  [_content addObject:[SimpleModel modelWithTextArray:@[ kExampleText, @"Detail text" ]
                                        textLineArray:@[ @(2), @(1) ]
                                            checkMark:NO
                                               circle:NO]];

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

#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];
  SimpleModel *model = _content[indexPath.item];
  cell.textLabel.text = model.text;
  cell.textLabel.numberOfLines = model.textLines;
  cell.detailTextLabel.text = model.detailText;
  cell.detailTextLabel.numberOfLines = model.detailTextLines;

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

  if (model.checkMark) {
    cell.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
  }
  if (model.circle) {
    cell.imageView.image =
        [self imageWithSize:CGSizeMake(40, 40) color:HEXCOLOR(0x80CBC4) cornerRadius:20];
  }

  return cell;
}

#pragma mark - <MDCCollectionViewStylingDelegate>

- (CGFloat)collectionView:(UICollectionView *)collectionView
    cellHeightAtIndexPath:(NSIndexPath *)indexPath {
  SimpleModel *model = _content[indexPath.item];
  NSInteger numberOfLines = model.textLines + model.detailTextLines;
  if (numberOfLines == 1) {
    return MDCCellDefaultOneLineHeight;
  } else if (numberOfLines == 2) {
    return MDCCellDefaultTwoLineHeight;
  } else if (numberOfLines == 3) {
    return MDCCellDefaultThreeLineHeight;
  }
  return MDCCellDefaultOneLineHeight;
}

#pragma mark - <MDCCollectionViewEditingDelegate>

- (BOOL)collectionViewAllowsEditing:(UICollectionView *)collectionView {
  return YES;
}

- (BOOL)collectionViewAllowsReordering:(UICollectionView *)collectionView {
  return YES;
}

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

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

- (void)collectionView:(UICollectionView *)collectionView
    willMoveItemAtIndexPath:(nonnull NSIndexPath *)indexPath
                toIndexPath:(nonnull NSIndexPath *)newIndexPath {
  // Update Model
  SimpleModel *model = _content[indexPath.item];
  [_content removeObjectAtIndex:indexPath.item];
  [_content insertObject:model atIndex:newIndexPath.item];
}

#pragma mark UIControlEvents

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

#pragma mark - Private helper methods

- (UIImage *)imageWithSize:(CGSize)size color:(UIColor *)color cornerRadius:(CGFloat)cornerRadius {
  // Create a colored image.
  UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size.width, size.height)];
  view.backgroundColor = color;
  view.layer.cornerRadius = cornerRadius;
  UIGraphicsBeginImageContextWithOptions(CGSizeMake(size.width, size.height), NO, 0);
  [view.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}

#pragma mark - CatalogByConvention

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

+ (BOOL)catalogIsPrimaryDemo {
  return NO;
}

+ (BOOL)catalogIsPresentable {
  return YES;
}

@end