Returns a new font with additional attributes based on the original font.


func CTFontCreateCopyWithAttributes(_ font: CTFont, _ size: CGFloat, _ matrix: UnsafePointer<CGAffineTransform>?, _ attributes: CTFontDescriptor?) -> CTFont



The original font reference on which to base the new font.


The point size for the font reference. If 0.0 is specified, the original font’s size is preserved.


The transformation matrix for the font. In most cases, set this parameter to be NULL. If NULL is specified, the original font's matrix is preserved.


A font descriptor containing additional attributes that the new font should contain.

Return Value

A new font reference converted from the original with the specified attributes.


This function provides a mechanism to change attributes quickly on a given font reference in response to user actions. For instance, the size can be changed in response to a user manipulating a size slider.

See Also

Creating Fonts

func CTFontCreateWithFontDescriptor(CTFontDescriptor, CGFloat, UnsafePointer<CGAffineTransform>?) -> CTFont

Returns a new font reference that best matches the given font descriptor.

func CTFontCreateUIFontForLanguage(CTFontUIFontType, CGFloat, CFString?) -> CTFont?

Returns the special user-interface font for the given language and user-interface type.

func CTFontCreateCopyWithFamily(CTFont, CGFloat, UnsafePointer<CGAffineTransform>?, CFString) -> CTFont?

Returns a new font in the specified family based on the traits of the original font.

func CTFontCreateForString(CTFont, CFString, CFRange) -> CTFont

Returns a new font reference that can best map the given string range based on the current font.