Chapter 20 Dynamic Type

Chapter 20 Dynamic Type

 

1. The Dynamic Type system is centered around text styles. When a font is requested for a given text style, the system will use the user’s preferred text size in association with the text style to return an appropriately configured font. Below shows the six different text styles:

UIFontTextStyleHeadline

UIFontTextStyleSubheadline

UIFontTextStyleBody

UIFontTextStyleFootnote

UIFontTextStyleCaption1

UIFontTextStyleCaption2

 

2. UIApplication exposes the text size that user selected through its preferredContentSizeCategory property. the method will return a contestant NSString with the name of the content size category, which will be one of the following values:

UIContentSizeCategoryExtraSmall

UIContentSizeCategorySmall

UIContentSizeCategoryMedium

UIContentSizeCategoryLarge (Default)

UIContentSizeCategoryExtraLarge

UIContentSizeCategoryExtraExtraLarge

UIContentSizeCategoryExtraExtraExtraLarge

-(void)updateTableViewForDynamicTypeSize

{

    static NSDictionary *cellHeightDictinary;

    if(!cellHeightDictinary)

    {

        cellHeightDictinary = @{UIContentSizeCategoryExtraSmall : @44,

                                UIContentSizeCategorySmall : @44,

                                UIContentSizeCategoryMedium : @44,

                                UIContentSizeCategoryLarge : @50,

                                UIContentSizeCategoryExtraLarge : @55,

                                UIContentSizeCategoryExtraExtraLarge : @65,

                                UIContentSizeCategoryExtraExtraExtraLarge : @75};

    }

    NSString *userSize = [[UIApplication sharedApplication] preferredContentSizeCategory];

    NSNumber *cellHeight = cellHeightDictinary[userSize];

    [self.tableView setRowHeight:cellHeight.floatValue];

    [self.tableView reloadData];

}

 

3. awakeFromNib method is called on an object after it has been unarchived from a NIB file, and is a great place to do any additional UI work that cannot be done within the XIB file.