A barbarian can take a rage power, such as Disruptive, that give him or her a feat while raging.
Disruptive: When raging, the barbarian gains Disruptive as a bonus feat. The barbarian must have the superstition rage power to select this rage power. A barbarian must be at least 8th level to select this rage power.
However, I don't know of any rage power that gives a feat that has Rage Class Feature as a prerequisite.
Or do you mean the more complicated question of whether a feat gained via a rage power and that can be used only during rage would count as having the feat for prerequisites for other feats? I have seen that question debated, but I don't recall the answer. As a GM, I would allow it myself. EDIT: I found some of those old threads, such as Brawler Rage Power Question and Barbarian Rage Powers and Feats. The responses disagree.
Both Ranger style feats and the TWF gained from Brawler's Flurry count as prerequisites even though they are conditional, so I would imagine a Rage Power bonus feat would work the same.
im talking about feats like raging vitality and reckless rage feats that only work during a rage could i spend a rage power to get them?
No, there is no rage power that says, "While raging, the barbarian gains Reckless Rage." Nor is there a rage power that lets the barbarian pick a feat.
And you cannot simply swap out a rage power for a feat, not even a feat designed for barbarians.