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Question

有人可以帮我解决我的代码问题

我在下面的代码中使用了2个按钮（在Qt GUi程序中）（第1版，第2版）

初始图片

1）当我按下第一个按钮时，Gbox中的输出..按下第一个按钮时

点击第一个按钮

2）当我按下第二按钮时，按下第二个按钮后，预期输出应该像Gbox中的预期输出

第二按钮单击时需要

但是按下Gbox中的第二个按钮后没有任何变化..按下第二个按钮后没有变化

选择Gbox_2nd按钮中的No_changes

#include "test.h"
#include "ui_test.h"
#include <QPushButton>
#include <QCheckBox>
#include <QVBoxLayout>
#include <QtWidgets>
#include <QLineEdit>
#include <QTextEdit>
#include <QGridLayout>
#include <QVBoxLayout>
#include <QGroupBox>

test::test(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::test)
{
    ui->setupUi(this);
    QVBoxLayout *mainLayout = new QVBoxLayout;

    ui->label_1->hide();
    ui->label_2->hide();
    ui->label_3->hide();
    ui->label_4->hide();
    ui->label_5->hide();
    ui->label_6->hide();
    ui->label_7->hide();

    ui->lineEdit_1->hide();
    ui->lineEdit_2->hide();
    ui->lineEdit_3->hide();
    ui->lineEdit_4->hide();
    ui->lineEdit_5->hide();
    ui->lineEdit_6->hide();
    ui->lineEdit_7->hide();

    ui->Optional->hide();

    Gbox->setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Maximum);
    Gbox->setTitle(tr("Gbox_11"));

    mainLayout->addWidget(Gbox);
    setLayout(mainLayout);
}

test::~test()
{
    delete ui;
}

void test::on_1st_clicked()
{
    ui->label_1->show();
    ui->lineEdit_1->show();
    ui->label_1->setText("R : ");

    ui->label_2->show();
    ui->lineEdit_2->show();
    ui->label_2->setText("ID : ");

    ui->label_3->show();
    ui->lineEdit_3->show();
    ui->label_3->setText("X : ");

    ui->label_4->show();
    ui->lineEdit_4->show();
    ui->label_4->setText("Y : ");

    ui->Optional->hide();
    ui->label_5->hide();
    ui->label_6->hide();
    ui->label_7->hide();
    ui->lineEdit_5->hide();
    ui->lineEdit_6->hide();
    ui->lineEdit_7->hide();
    ui->Gbox->show();

    QPushButton *Road = new QPushButton("R");
    QPushButton *Junction = new QPushButton("J");
    QPushButton *Lane = new QPushButton("L");
    QPushButton *Objects = new QPushButton("O");
    QPushButton *Vehical = new QPushButton("V");
    QPushButton *Fupdates = new QPushButton("F");

    glay = new QGridLayout;

    glay->addWidget(Road,0,0,1,1);
    glay->addWidget(Junction,1,1,1,1);
    glay->addWidget(Lane,2,0,1,1);
    glay->addWidget(Objects,3,1,1,1);
    glay->addWidget(Vehical,4,2,1,1);
    glay->addWidget(Fupdates,5,3,1,1);

    setLayout(glay);

    ui->Gbox->setLayout(glay);
}

void test::on_2nd_clicked()
{
    ui->label_1->show();
    ui->lineEdit_1->show();
    ui->label_1->setText("J: ");

    ui->label_2->show();
    ui->lineEdit_2->show();
    ui->label_2->setText("ID : ");

    ui->label_3->show();
    ui->lineEdit_3->show();
    ui->label_3->setText("X : ");

    ui->label_4->show();
    ui->lineEdit_4->show();
    ui->label_4->setText("Y : ");

    ui->Optional->show();
    ui->Gbox->show();

    QPushButton *A = new QPushButton("1");
    QPushButton *B = new QPushButton("2");
    QPushButton *C = new QPushButton("3");
    QPushButton *D = new QPushButton("4");
    QPushButton *E = new QPushButton("5");
    QPushButton *F = new QPushButton("6");

    vlay = new QVBoxLayout;

    vlay->addWidget(A,1);
    vlay->addWidget(B,0);
    vlay->addWidget(C,0);
    vlay->addWidget(D,1);
    vlay->addWidget(E,1);
    vlay->addWidget(F,0);
    setLayout(vlay);

    ui->Gbox->setLayout(vlay);
}

void test::on_Optional_stateChanged()
{
    if(ui->Optional->isChecked())
    {
        ui->label_5->show();
        ui->label_5->setText("P :");

        ui->label_6->show();
        ui->label_6->setText("S 1 :");

        ui->label_7->show();
        ui->label_7->setText("S 2 :");

        ui->lineEdit_5->show();
        ui->lineEdit_6->show();
        ui->lineEdit_7->show();
    }
    else
    {
        ui->label_5->hide();
        ui->label_6->hide();
        ui->label_7->hide();
        ui->lineEdit_5->hide();
        ui->lineEdit_6->hide();
        ui->lineEdit_7->hide();
    }
}

Answer 1

在每个方法中使用QLabel :: repaint（），并在为GBox设置新布局之前删除先前设置的布局，例如：

void test::on_2nd_clicked(){
                    ui->label_1->repaint();
                    ui->label_1->setText("J: ");

                    ui->label_2->repaint();
                    ui->label_2->setText("ID : ");
                    ...
                    ...
 QPushButton *A = new QPushButton("1");
    QPushButton *B = new QPushButton("2");
    QPushButton *C = new QPushButton("3");
    QPushButton *D = new QPushButton("4");
    QPushButton *E = new QPushButton("5");
    QPushButton *F = new QPushButton("6");

    vlay = new QVBoxLayout;


    vlay->addWidget(A,1);
    vlay->addWidget(B,0);
    vlay->addWidget(C,0);
    vlay->addWidget(D,1);
    vlay->addWidget(E,1);
    vlay->addWidget(F,0);
    setLayout(vlay);
    delete glay;
    ui->Gbox->setLayout(vlay);

    }