如何在Swift 3中居中和纵横适合图像？

I have a project in Swift 3 that I am using a gradient on the view. I placed a image on the view, but it is under the gradient layer so I was going to draw the image programmatically instead of with the storyboard. I can't seem to figure out how to get the image to be centered and to aspect fit inside the bounds of the view.I have a project in Swift 3 that I am using a g