如何在Swift中将某些数据解析成数组？

I'm reading a .txt file in iOS/Swift. I get all my information from the text file. The problem is I only want to get the usernames and store them in an array. Right now I think it's storing all my data from .txt file in a string. How can I parse this correctly so I have only the usernames in an array?I'm reading a .txt file in iOS/Swift. I get all