NSAttributedText＆Dynamic Type

OS7MainViewController.m

//
//  OS7MainViewController.m
//  iOS7Test
//
//  Copyright (c) 2013年 glayash. All rights reserved.
//

#import "OS7MainViewController.h"

static NSString * const CellIdentifier = @"MainViewCell";
static const CGFloat PADDING = 16;
static const CGFloat TABLEVIEWCELL_MARGIN = 40;

@interface OS7MainViewController ()

@property (nonatomic) NSArray *tableTexts;
@property (nonatomic) NSString *detailText;

@property (nonatomic) NSDictionary *bodyAttribute;
@property (nonatomic) NSDictionary *subTitleAttribute;

@property (weak, nonatomic) IBOutlet UITableView *tableView;

@end

@interface CustomCell : UITableViewCell

@end

@implementation OS7MainViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.title = @"メイン";
    
    [self.tableView registerClass:[CustomCell class] forCellReuseIdentifier:CellIdentifier];
    
    self.tableTexts = @[@"りんごは浮かんだお空に…\nりんごは落っこちた地べたに…,
                        @"星が生まれて\n歌が生まれて\nルルアメルは笑った\n常しえと",
                        @"星がキスして\n歌が眠って\かえるとこは どこでしょう…？\nかえるとこは どこでしょう…？",
                        @"りんごは落っこちた地べたに…\nりんごは浮かんだお空に…"];
    self.detailText = @"Apple (Symphogear)";
    [self _refreshFontAttributes];

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

/**
 フォントサイズ変更の通知を受け取った際に、
 フォント属性を更新した上で、テーブルを再描画する
 */
- (void)preferredContentSizeChanged:(NSNotification *)aNotification {
    [self _refreshFontAttributes];
    [self.tableView reloadData];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

#pragma mark - UITableView Delegate & DataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.tableTexts count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    [self _updateCell:cell atIndexPath:indexPath];
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    CGFloat cellWidth = self.tableView.bounds.size.width - TABLEVIEWCELL_MARGIN;
    
    CGFloat mainTextHeight = [self.tableTexts[indexPath.row] boundingRectWithSize:CGSizeMake(cellWidth, CGFLOAT_MAX)
                                                                       options:NSStringDrawingUsesLineFragmentOrigin
                                                                    attributes:self.bodyAttribute
                                                                       context:nil].size.height;
    CGFloat detailTextHeight = [self.detailText boundingRectWithSize:CGSizeMake(cellWidth, CGFLOAT_MAX)
                                                             options:NSStringDrawingUsesLineFragmentOrigin
                                                          attributes:self.subTitleAttribute
                                                             context:nil].size.height;
    
    return mainTextHeight + detailTextHeight + PADDING;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

#pragma mark - private methods

/**
 フォント属性を更新する
 */
- (void)_refreshFontAttributes
{
    self.bodyAttribute = @{NSFontAttributeName : [UIFont preferredFontForTextStyle:UIFontTextStyleBody]};
    self.subTitleAttribute = @{NSFontAttributeName : [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline],
                               NSForegroundColorAttributeName : [UIColor darkGrayColor]};
}

/**
 セルを更新して返却する
 */
- (void)_updateCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
    cell.textLabel.attributedText = [[NSAttributedString alloc] initWithString:self.tableTexts[indexPath.row]
                                                                    attributes:self.bodyAttribute];
    cell.detailTextLabel.attributedText = [[NSAttributedString alloc] initWithString:self.detailText
                                                                          attributes:self.subTitleAttribute];
}


@end

@implementation CustomCell

-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:reuseIdentifier];
    
    if(self){
        cell.textLabel.numberOfLines = 0;
    }
    
    return self;
}

@end