Cheng Yi worked on his commentary on the Book of Changes for much of his life and finished it late, and it takes a deliberate position on what the book is for. The hexagram is read as a situation, its six lines as positions within that situation, and the relations between lines as relations between persons in office: ruler and minister, senior and junior, the man in the wrong place at the wrong time. What the text tells you is how a person of integrity should conduct themselves in the configuration described. It does not tell you what will happen.
That reading effectively removed divination from a divination manual, and Zhu Xi, who took over almost everything else from him, would not follow him here. Zhu Xi wrote his own commentary restoring the Changes to its original use as a book of prognostication, while keeping Cheng Yi's metaphysics of principle. The two commentaries were later printed together, so that generations of examination candidates read the moral and the divinatory readings side by side.
His political career ran the other way from his influence. He was tutor to the young emperor Zhezong, and his severity in that post made enemies; when the reform faction returned to power he was stripped of office, banished to Fuzhou in 1097, and his teaching was proscribed, with his followers forbidden to study under him. He died in 1107 under that ban.
Roughly two centuries later, in 1313, the Cheng and Zhu commentaries were made the basis of the civil service examinations, and stayed there until the examinations were abolished in 1905.