My rose bush was pruned in spring has no buds or flowers.
The first possibility, assuming your rose is otherwise healthy and leafed out, is that your plant may be a “species rose” that blooms on wood produced in the previous season. If you know the name of your rose, it will be possible for you to research the pruning practices that work best. The Toronto Master Gardeners has a guide specifically to help with this:
A lack of buds can also result from disease, pests, environmental issues, cultural practices, or nutrient imbalance. It is a good idea to check the stems and leaves of your rose carefully to see if there are any insect pests: thrips, for instance, are sucking insects that attack leaves, stems and buds and can cause serious damage. The root knot nematode is another pest that attacks the roots of roses, resulting in weak and stunted growth. Too little phosphorus, which is essential for flowering, can be responsible for lack of blooms as well as general stunted growth. Enriching your soil with organic material can help here, and you could consider a fertilizer specially formulated for roses. If your rose is in a shaded area, flowers may fail to develop, as they require full sun. Finally, that old culprit, the weather: a cold winter may cause dieback of both stems and buds. If you provide your rose with the best growing environment possible, I hope you will be rewarded by blooms next summer.