I can Swipe Phone from Lock Screen and Unlock it.. But then the Bar goes away???

I tried resetting it and nothing happened.

How exactly did you "reset" the iPhone?

Did you mean to say you performed a Forced Restart on the iPhone? Force restart iPhone - Apple Support

Users who try this unfortunately often do not follow the instructions carefully. Post back if you need more help with this.

The "bar" is not visible at the bottom of my iPhone and I can "drag" from the center bottom of the screen up and the app switcher appears.

So, the fact that the bar is not appearing at the bottom of the screen is not the issue here.

As Mac Jim ID says, it is more of a "drag" than a "swipe". Most users swipe much faster than they drag.

Try experimenting with the speed of the "drag" up to the center of the screen.

Vivian-- wrote:

My phone can be swiped up to unlock but then once I get into my phone the white bar on the bottom disappears.

The white bar disappearing is normal.

You should still be able to swipe up from the very bottom to change apps.

In order to access the App Switcher for manually closing/switching apps, I would not call that a swipe gesture from the bottom of the screen. It is more of a controlled drag from the bottom to the middle. The bar on the bottom does not have to be there and typically it is not after unlocking your phone.