Since there are three different libraries in Mac, developers are usually confused with the three scenarios. However, you can find out your PostgreSQL directory with one of the two methods on the Mac Computer.
1. Directory--Absolute Path
1). Scroll up your mouse to the left top of Mac Screen
2). Click the menu "Go"
3). Select the "Go to Folder..."
4). Input the path
Please change "username" to your name such as "jack" listed as follows.
5). Choose the button "Go" to the directory of Postgres.
You will eventually find out Postgres.
2. Find the directory step by step
1). Scroll up your mouse to the left top of Mac Screen.
2). Click the menu "Go".
3). Select the button "Library"
4). Double click the file holder "Application Support".
5). Find out "Postgres" according to the alphabetic order.