Dynamic Type 动态类型
1.比如字体。使用动态的用户自定义的系统字体。
-(void)updateFonts
{
UIFont *font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
self.nameLabel.font = font;
self.dataLabel.font = font;
}
2.注册，获取修改通知
当用户修改了字体或者系统设置，会发送一个消息，UIContentSizeCategoryDidChangeNotification
//....
NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
[defaultCenter addObserver:self
selector:@selector(updateFonts:)
name:UIContentSizeCategoryDidChangeNotification
object:nil];
!!!注意，记得移除
-(void)dealloc
{
NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
[defaultCenter removeObserver:self];
}
3.重新设置布局
intrinsicContentSize
nameLabel.leading = superview.leading + 8
nameField.leading = nameLabel.trailing + 8
nameField.trailing = superview.trailing - 8
4.获取用户设置的字体大小，更改单元格的高度
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self updateTableViewForDynamicTypeSize];
}
-(void)updateTableViewForDynamicTypeSize
{
static NSDictionary *cellHeightDicrionary;
if(!cellHeightDicrionary){
cellHeightDictionary = @{ UIContentSizeCategoryExtraSmall : @44,
UIContentSizeCategorySmall : @44,
UIContentSizeCategoryMedium : @44,
UIContentSizeCategoryLarge : @44,
UIContentSizeCategoryExtraLarge : @55,
UIContentSizeCategoryExtraExtraLarge : @65,
UIContentSizeCategoryExtraExtraExtraLarge : @75 };
}
NSString *userSize = [[UIApplication sharedApplication] preferredContentSizeCategory];
NSNumber *cellHeight = cellHeightDicrionary[userSize];
[self.tableView setRowHeigt:cellHeight.floatValue];
//然后再加载数据
[self.tableView reloadData];
}
5.Updating BNRItemCell
awakeFromNib
Constraint outlets
Placeholder constraints
Big Nerd iOS Programming 第20章 Dynamic Type 动态类型
原文：http://www.cnblogs.com/wuyr/p/4275460.html