material-components_material-components-ios/components/Typography/examples/TypographyCustomFontViewController.m

/*
 Copyright 2017-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 "TypographyCustomFontViewController.h"

#import "MaterialTypography.h"

@implementation TypographyCustomFontViewController {
   NSArray<NSString *> *_strings;
   NSArray<NSString *> *_styleNames;
   NSArray<UIFont *> *_styleFonts;
   NSArray<NSNumber *> *_opacities;
}

static inline UIFont *customFont(MDCFontTextStyle style) {
   UIFontDescriptor *descriptor = [UIFontDescriptor mdc_preferredFontDescriptorForMaterialTextStyle:style];
   descriptor = [descriptor fontDescriptorWithFamily:@"American Typewriter"];
   UIFont *font = [UIFont fontWithDescriptor:descriptor size:descriptor.pointSize];
   return font;
};

- (void)viewDidLoad {
   [super viewDidLoad];
   // Do any additional setup after loading the view, typically from a nib.
   self.view.backgroundColor = [UIColor whiteColor];
   self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

   self.tableView.rowHeight = UITableViewAutomaticDimension;
   self.tableView.estimatedRowHeight = 50.0;
   _strings = @[
                @"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
                @"abcdefghijklmnopqrstuvwxyz",
                @"0123456789"
                ];

   _styleNames = @[
                   // Common UI fonts.
                   @"Headline Font",
                   @"Title Font",
                   @"Subhead Font",
                   @"Body 2 Font",
                   @"Body 1 Font",
                   @"Caption Font",
                   @"Button Font",

                   // Display fonts (extra large fonts)
                   @"Display 1 Font",
                   @"Display 2 Font",
                   @"Display 3 Font",
                   @"Display 4 Font"
                   ];

   _styleFonts = @[
                   customFont(MDCFontTextStyleHeadline),
                   customFont(MDCFontTextStyleTitle),
                   customFont(MDCFontTextStyleSubheadline),
                   customFont(MDCFontTextStyleBody2),
                   customFont(MDCFontTextStyleBody1),
                   customFont(MDCFontTextStyleCaption),
                   customFont(MDCFontTextStyleButton),
                   customFont(MDCFontTextStyleDisplay1),
                   customFont(MDCFontTextStyleDisplay2),
                   customFont(MDCFontTextStyleDisplay3),
                   customFont(MDCFontTextStyleDisplay4)
                   ];

   _opacities = @[
                  @([MDCTypography headlineFontOpacity]),
                  @([MDCTypography titleFontOpacity]),
                  @([MDCTypography subheadFontOpacity]),
                  @([MDCTypography body2FontOpacity]),
                  @([MDCTypography body1FontOpacity]),
                  @([MDCTypography captionFontOpacity]),
                  @([MDCTypography buttonFontOpacity]),
                  @([MDCTypography display1FontOpacity]),
                  @([MDCTypography display2FontOpacity]),
                  @([MDCTypography display3FontOpacity]),
                  @([MDCTypography display4FontOpacity])
                  ];

   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(contentSizeCategoryDidChange:)
                                                name:UIContentSizeCategoryDidChangeNotification
                                              object:nil];
}

- (void)contentSizeCategoryDidChange:(NSNotification *)notification {
   // Update font array to reflect new size category
   _styleFonts = @[
                   customFont(MDCFontTextStyleHeadline),
                   customFont(MDCFontTextStyleTitle),
                   customFont(MDCFontTextStyleSubheadline),
                   customFont(MDCFontTextStyleBody2),
                   customFont(MDCFontTextStyleBody1),
                   customFont(MDCFontTextStyleCaption),
                   customFont(MDCFontTextStyleButton),
                   customFont(MDCFontTextStyleDisplay1),
                   customFont(MDCFontTextStyleDisplay2),
                   customFont(MDCFontTextStyleDisplay3),
                   customFont(MDCFontTextStyleDisplay4)
                   ];

   [self.tableView reloadData];
}

#pragma mark - UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
   return _strings.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
   return _styleFonts.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
   UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:@"cell"];
   if (cell == nil) {
      cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
                                    reuseIdentifier:@"cell"];
   }
   cell.textLabel.text = _strings[indexPath.section];
   cell.textLabel.font = _styleFonts[indexPath.row];
   cell.textLabel.alpha = [_opacities[indexPath.row] floatValue];
   cell.textLabel.numberOfLines = 0;
   cell.textLabel.lineBreakMode = NSLineBreakByWordWrapping;

   if (cell.textLabel.font.pointSize > 100 && indexPath.section == 0) {
      cell.textLabel.text = @"ABCD";
   }

   cell.detailTextLabel.text = _styleNames[indexPath.row];
   cell.detailTextLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleCaption1];

   cell.selectionStyle = UITableViewCellSelectionStyleNone;

   return cell;
}

#pragma mark - CatalogByConvention

+ (NSArray *)catalogBreadcrumbs {
   return @[ @"Typography and Fonts", @"Custom Font Example" ];
}

+ (BOOL)catalogIsPrimaryDemo {
   return NO;
}

+ (BOOL)catalogIsPresentable {
  return YES;
}

@end