以编程方式更改标签栏项目图像

I am working on an app in Xcode. I currently have three tabBarItems on my tab bar. I want the middle one to be a picture chosen by the user. I have the desired picture in a variable and i have the tabbar.swift set up to put the code in. I just need to set the image to the variables image with correct size (and make the picture appear as a circle) and the title name to a string. Any help in doing this would be much appreciated. ThanksI am working on an app in Xcode. I currently ha