The I Ching does not predict the future.
Many people do use the Yijing to predict the future. However, the future does not exist somewhere. Reality is not like some videotape, so that you can know the future if you know how to fast-forward. Only what's there now is real, there is only the current moment. So it cannot be true that the Yijing really predicts the future.
But, as it shows intentions and upcoming changes and results, and intent usually leads to something happening, one can get the impression that the Yi does predict the future. This is however not so, as intent can change due to new circumstances change of heart 3rd parties or external interferances.
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