Is there any way to prevent the system shortcut key (Shift+Cmd+4) from working when entering text on a Mac?

In macOS 10.15, we are creating an application (Swift) to capture text (TextFilet) keystrokes, but if you press the key that is registered in the shortcut key on the system, the shortcut functionality will work.
Is there any way to prevent shortcut function in the app?

[Example Shortcut Key]
·Shift+Cmd+4→Screen capture works
·Control+space→Input switching works
·Command+space→Spotlight works

When you press a shortcut, keyDown() is not also called, so you can't find a solution.