I have implemented Cello's paragraph and character styles as thin wrappers for CTParagraphStyle and CFDictionary. This corresponds to the way that text styling is handled in core text.
The API for CTParagraphStyle is rather thin. There is, for example, no CTMutableParagraphStyle - which means that API supports the creation of a CTParagraphStyle in one hit - but you can not set properties one by one. Fortunately the CTParagraphStyle is toll-free bridged to NSParagraphStyle which has a far richer interface including the ability to make a mutable copy.
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