How to set the initial width can use QListWidget and use splitter to adjust the size？

Question

hi，I want to set the initial width can use QListWidget，and use splitter to adjust the size.

I want such as this.

but now，when I use the splitter, is like this.

Answer 1

There's no way to set initial sizes of QSplitter children using Qt Designer. Once you've converted from .ui to .py, you can set the size of each pane using setSizes(list_of_sizes). i.e. for a two-pane window:

splitter = QtWidgets.QSplitter()
splitter.setSizes((50,100))

Answer 2

When using the QSplitter class, you have the setSizes method, which is basically a list of width corresponding to each children

QList<int> widgetsWidth;
widgetsWidth << 100 << 100 << 100 << 400;
ui->mySplitter->setSizes(widgetsWidth);