Use of UIC in QT

uic What is it? ?

User Interface Compiler (uic)： User interface compiler

uic What's the usage? ?

qmake Going to call uic The program put ui The file is converted to .h file
uic Will read ui file , Compile him into C++ It's understandable .h file ;
In a word , Is to put .ui File conversion to C++ cognitive .h file

How to use

The first step is the menu bar , find qt The compiler , What I chose was
Qt 5.14.1 (MinGW 7.3.0 64-bit)

Open as shown in the following figure :
find F:\QT_code\calculator The path of

Under this path mainwindow.ui, We're going to use uic, Will this .ui File conversion to ui_mainwindow.h file
Use it directly uic xxxxx.ui >> ui_xxxxx.h command

then ui_mainwindow.h The file will still appear in F:\QT_code\calculator Under the path