1.设置列宽之后再去按模型设置treeview会导致列宽设置失败
以下为错误演示
Model = new QStandardItemModel();
Model->setColumnCount(2); //列
//设置标题
Model->setHeaderData(0,Qt::Horizontal,"文件名称");
Model->setHeaderData(1,Qt::Horizontal,"文件大小");
//列宽
ui->treeView->setColumnWidth(0, 300);
ui->treeView->setModel(Model);
正确演示如下，先设置模型，再去设置列宽
Model = new QStandardItemModel();
Model->setColumnCount(2); //列
//设置标题
Model->setHeaderData(0,Qt::Horizontal,"文件名称");
Model->setHeaderData(1,Qt::Horizontal,"文件大小");
//列宽
ui->treeView->setModel(Model);
ui->treeView->setColumnWidth(0, 300);