头文件

：
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>


#include <QLineEdit>
#include <QTextEdit>
#include <QComboBox>
#include <QTimeEdit>
#include <QDial>
#include <QSlider>
#include <QScrollBar>

#include <QLabel>
#include <QLCDNumber>
#include <QProgressBar>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private:
    Ui::Widget *ui;

    QLineEdit *LineEdit;
    QTextEdit *TextEdit;
    QComboBox *ComboBox;
    QTimeEdit *TimeEdit;
    QDial * Dial;
    QSlider *Slider;
    QScrollBar *ScrollBar;


    QLabel *Label1,*Label2;
    QLCDNumber *LCDNumber;
    QProgressBar *ProgressBar;

};

#endif // WIDGET_H

Widget.cpp，类的实现

#include "widget.h"
#include "ui_widget.h"


#include <QVBoxLayout>
#include <QHBoxLayout>


Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);



    LineEdit = new QLineEdit;
    TextEdit = new QTextEdit;
    ComboBox = new QComboBox;
    ComboBox->addItem("wzfdashuaibi");
     ComboBox->addItem("woshinibaba");
    TimeEdit = new QTimeEdit;
    Dial = new QDial;
    Dial->setBaseSize(1000,1000);
    Slider =new QSlider;
    Slider->setOrientation(Qt::Horizontal);
    ScrollBar = new QScrollBar;
    ScrollBar->setOrientation(Qt::Horizontal);

    QVBoxLayout *vbox0 = new QVBoxLayout;
    vbox0->addWidget(LineEdit);
    vbox0->addWidget(TextEdit);
    vbox0->addWidget(ComboBox);
    vbox0->addWidget(TimeEdit);
    vbox0->addWidget(Dial);
    vbox0->addWidget(Slider);
    vbox0->addWidget(ScrollBar);


    Label1 = new QLabel("HELLO WORLD!");
    Label2 = new QLabel;
    QPixmap pix("1.png");
    Label2->setFixedSize(100,120);
    Label2->setScaledContents(true);
    Label2->setPixmap(pix);
    LCDNumber = new QLCDNumber;
    ProgressBar = new QProgressBar;

    QVBoxLayout *vbox1 = new QVBoxLayout;
    vbox1->addWidget(Label1);
    vbox1->addWidget(Label2);
    vbox1->addWidget(LCDNumber);
    vbox1->addWidget(ProgressBar);

    QHBoxLayout *Hbox = new QHBoxLayout;
    Hbox->addLayout(vbox0);
    Hbox->addLayout(vbox1);

    this->setLayout(Hbox);

    //信号与槽
    connect(Dial,SIGNAL(valueChanged(int)), LCDNumber,SLOT(display(int)));
    connect(Dial,SIGNAL(valueChanged(int)),  Slider,SLOT(setValue(int)));
    connect(Dial,SIGNAL(valueChanged(int)), ScrollBar,SLOT(setValue(int)));

}

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

mian

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

效果：