The alignment of text in the writing direction of the first line of text.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 6.0+
- Core Media
Value must be one of the
CFString constants in Alignment Type Constants indicating the alignment in the writing direction of the first line of text of the cue. The writing direction is indicated by the value (or absence) of the
k attribute. The default value of this attribute is
If used, this attribute must be applied to the entire attributed string.