If you do not want to drill into your tile - the tension mount shower rod holders are the answer. Designed to work with a 1" diameter straight shower rod. The end flanges have a rubber backing to protect the tile. One flange is made of two parts. Twisting one of the flanges is what makes the tension to hold up the shower rod.
Finishes
Flat Black/ Oil Rubbed Bronze
Polished Brass/ Polished Chrome
Polished Nickel/ Satin Nickel