imgui 在 window 的根目录中不能有空 ID。如果您需要一个空的 label，请使用 ## 并阅读有关 ID 堆栈工作原理的常见问题解答

Question

So, i get following error if you try to initialize imgui element without label.

ui.slider("", 10, 40, &mut input_font_size)

Assertion failed: (id != window->ID && "Cannot have an empty ID at the root of a window. If you need an empty label, use ## and read the FAQ about how the ID Stack works!"), function ItemAdd, file imgui.cpp, line 7793.

Answer 1

To create imgui element without a visible label, just place

##

at the start of it like so:

ui.slider("##slider1", 10, 40, &mut input_font_size)

The example made with rust tweak of imgui - imgui-rs, for c++ solution is similar.