要点说明：
1、一个textedit控件，其余全部是button控件，button布局方式：栅格布局（Grid layout）
2、对窗体的Title进行修改（默认是工程名）
3、在ui文件中设计的UI，编译器会自动创建一个类，在这个类的创建依据就是在用户自定义的类中说明的：
通过ctrl+鼠标左键可以查看生成的类的详细情况：
1 /********************************************************************************
2 ** Form generated from reading UI file 'dialog.ui'
3 **
4 ** Created by: Qt User Interface Compiler version 5.12.3
5 **
6 ** WARNING! All changes made in this file will be lost when recompiling UI file!
7 ********************************************************************************/
8
9 #ifndef UI_DIALOG_H
10 #define UI_DIALOG_H
11
12 #include <QtCore/QVariant>
13 #include <QtWidgets/QApplication>
14 #include <QtWidgets/QDialog>
15 #include <QtWidgets/QGridLayout>
16 #include <QtWidgets/QLabel>
17 #include <QtWidgets/QPushButton>
18 #include <QtWidgets/QVBoxLayout>
19
20 QT_BEGIN_NAMESPACE
21
22 class Ui_Dialog
23 {
24 public:
25 QVBoxLayout *verticalLayout;
26 QLabel *lab_display;
27 QGridLayout *gridLayout;
28 QPushButton *btn_7;
29 QPushButton *btn_8;
30 QPushButton *btn_9;
31 QPushButton *btn_add;
32 QPushButton *btn_4;
33 QPushButton *btn_5;
34 QPushButton *btn_6;
35 QPushButton *btn_dec;
36 QPushButton *btn_1;
37 QPushButton *btn_2;
38 QPushButton *btn_3;
39 QPushButton *btn_mult;
40 QPushButton *btn_c;
41 QPushButton *btn_0;
42 QPushButton *btn_eq;
43 QPushButton *btn_div;
44
45 void setupUi(QDialog *Dialog)
46 {
47 if (Dialog->objectName().isEmpty())
48 Dialog->setObjectName(QString::fromUtf8("Dialog"));
49 Dialog->resize(338, 334);
50 verticalLayout = new QVBoxLayout(Dialog);
51 verticalLayout->setSpacing(6);
52 verticalLayout->setContentsMargins(11, 11, 11, 11);
53 verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
54 lab_display = new QLabel(Dialog);
55 lab_display->setObjectName(QString::fromUtf8("lab_display"));
56 lab_display->setStyleSheet(QString::fromUtf8("font: 24pt \"Algerian\";\n"
57 "background-color: rgb(190, 190, 255);"));
58 lab_display->setAlignment(Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter);
59
60 verticalLayout->addWidget(lab_display);
61
62 gridLayout = new QGridLayout();
63 gridLayout->setSpacing(6);
64 gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
65 btn_7 = new QPushButton(Dialog);
66 btn_7->setObjectName(QString::fromUtf8("btn_7"));
67 QSizePolicy sizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
68 sizePolicy.setHorizontalStretch(0);
69 sizePolicy.setVerticalStretch(0);
70 sizePolicy.setHeightForWidth(btn_7->sizePolicy().hasHeightForWidth());
71 btn_7->setSizePolicy(sizePolicy);
72
73 gridLayout->addWidget(btn_7, 0, 0, 1, 1);
74
75 btn_8 = new QPushButton(Dialog);
76 btn_8->setObjectName(QString::fromUtf8("btn_8"));
77 sizePolicy.setHeightForWidth(btn_8->sizePolicy().hasHeightForWidth());
78 btn_8->setSizePolicy(sizePolicy);
79
80 gridLayout->addWidget(btn_8, 0, 1, 1, 1);
81
82 btn_9 = new QPushButton(Dialog);
83 btn_9->setObjectName(QString::fromUtf8("btn_9"));
84 sizePolicy.setHeightForWidth(btn_9->sizePolicy().hasHeightForWidth());
85 btn_9->setSizePolicy(sizePolicy);
86
87 gridLayout->addWidget(btn_9, 0, 2, 1, 1);
88
89 btn_add = new QPushButton(Dialog);
90 btn_add->setObjectName(QString::fromUtf8("btn_add"));
91 sizePolicy.setHeightForWidth(btn_add->sizePolicy().hasHeightForWidth());
92 btn_add->setSizePolicy(sizePolicy);
93
94 gridLayout->addWidget(btn_add, 0, 3, 1, 1);
95
96 btn_4 = new QPushButton(Dialog);
97 btn_4->setObjectName(QString::fromUtf8("btn_4"));
98 sizePolicy.setHeightForWidth(btn_4->sizePolicy().hasHeightForWidth());
99 btn_4->setSizePolicy(sizePolicy);
100
101 gridLayout->addWidget(btn_4, 1, 0, 1, 1);
102
103 btn_5 = new QPushButton(Dialog);
104 btn_5->setObjectName(QString::fromUtf8("btn_5"));
105 sizePolicy.setHeightForWidth(btn_5->sizePolicy().hasHeightForWidth());
106 btn_5->setSizePolicy(sizePolicy);
107
108 gridLayout->addWidget(btn_5, 1, 1, 1, 1);
109
110 btn_6 = new QPushButton(Dialog);
111 btn_6->setObjectName(QString::fromUtf8("btn_6"));
112 sizePolicy.setHeightForWidth(btn_6->sizePolicy().hasHeightForWidth());
113 btn_6->setSizePolicy(sizePolicy);
114
115 gridLayout->addWidget(btn_6, 1, 2, 1, 1);
116
117 btn_dec = new QPushButton(Dialog);
118 btn_dec->setObjectName(QString::fromUtf8("btn_dec"));
119 sizePolicy.setHeightForWidth(btn_dec->sizePolicy().hasHeightForWidth());
120 btn_dec->setSizePolicy(sizePolicy);
121
122 gridLayout->addWidget(btn_dec, 1, 3, 1, 1);
123
124 btn_1 = new QPushButton(Dialog);
125 btn_1->setObjectName(QString::fromUtf8("btn_1"));
126 sizePolicy.setHeightForWidth(btn_1->sizePolicy().hasHeightForWidth());
127 btn_1->setSizePolicy(sizePolicy);
128
129 gridLayout->addWidget(btn_1, 2, 0, 1, 1);
130
131 btn_2 = new QPushButton(Dialog);
132 btn_2->setObjectName(QString::fromUtf8("btn_2"));
133 sizePolicy.setHeightForWidth(btn_2->sizePolicy().hasHeightForWidth());
134 btn_2->setSizePolicy(sizePolicy);
135
136 gridLayout->addWidget(btn_2, 2, 1, 1, 1);
137
138 btn_3 = new QPushButton(Dialog);
139 btn_3->setObjectName(QString::fromUtf8("btn_3"));
140 sizePolicy.setHeightForWidth(btn_3->sizePolicy().hasHeightForWidth());
141 btn_3->setSizePolicy(sizePolicy);
142
143 gridLayout->addWidget(btn_3, 2, 2, 1, 1);
144
145 btn_mult = new QPushButton(Dialog);
146 btn_mult->setObjectName(QString::fromUtf8("btn_mult"));
147 sizePolicy.setHeightForWidth(btn_mult->sizePolicy().hasHeightForWidth());
148 btn_mult->setSizePolicy(sizePolicy);
149
150 gridLayout->addWidget(btn_mult, 2, 3, 1, 1);
151
152 btn_c = new QPushButton(Dialog);
153 btn_c->setObjectName(QString::fromUtf8("btn_c"));
154 sizePolicy.setHeightForWidth(btn_c->sizePolicy().hasHeightForWidth());
155 btn_c->setSizePolicy(sizePolicy);
156
157 gridLayout->addWidget(btn_c, 3, 0, 1, 1);
158
159 btn_0 = new QPushButton(Dialog);
160 btn_0->setObjectName(QString::fromUtf8("btn_0"));
161 sizePolicy.setHeightForWidth(btn_0->sizePolicy().hasHeightForWidth());
162 btn_0->setSizePolicy(sizePolicy);
163
164 gridLayout->addWidget(btn_0, 3, 1, 1, 1);
165
166 btn_eq = new QPushButton(Dialog);
167 btn_eq->setObjectName(QString::fromUtf8("btn_eq"));
168 sizePolicy.setHeightForWidth(btn_eq->sizePolicy().hasHeightForWidth());
169 btn_eq->setSizePolicy(sizePolicy);
170
171 gridLayout->addWidget(btn_eq, 3, 2, 1, 1);
172
173 btn_div = new QPushButton(Dialog);
174 btn_div->setObjectName(QString::fromUtf8("btn_div"));
175 sizePolicy.setHeightForWidth(btn_div->sizePolicy().hasHeightForWidth());
176 btn_div->setSizePolicy(sizePolicy);
177
178 gridLayout->addWidget(btn_div, 3, 3, 1, 1);
179
180
181 verticalLayout->addLayout(gridLayout);
182
183 verticalLayout->setStretch(0, 2);
184 verticalLayout->setStretch(1, 8);
185
186 retranslateUi(Dialog);
187
188 QMetaObject::connectSlotsByName(Dialog);
189 } // setupUi
190
191 void retranslateUi(QDialog *Dialog)
192 {
193 Dialog->setWindowTitle(QApplication::translate("Dialog", "\350\256\241\347\256\227\345\231\250", nullptr));
194 lab_display->setText(QApplication::translate("Dialog", "0", nullptr));
195 btn_7->setText(QApplication::translate("Dialog", "7", nullptr));
196 btn_8->setText(QApplication::translate("Dialog", "8", nullptr));
197 btn_9->setText(QApplication::translate("Dialog", "9", nullptr));
198 btn_add->setText(QApplication::translate("Dialog", "+", nullptr));
199 btn_4->setText(QApplication::translate("Dialog", "4", nullptr));
200 btn_5->setText(QApplication::translate("Dialog", "5", nullptr));
201 btn_6->setText(QApplication::translate("Dialog", "6", nullptr));
202 btn_dec->setText(QApplication::translate("Dialog", "-", nullptr));
203 btn_1->setText(QApplication::translate("Dialog", "1", nullptr));
204 btn_2->setText(QApplication::translate("Dialog", "2", nullptr));
205 btn_3->setText(QApplication::translate("Dialog", "3", nullptr));
206 btn_mult->setText(QApplication::translate("Dialog", "*", nullptr));
207 btn_c->setText(QApplication::translate("Dialog", "C", nullptr));
208 btn_0->setText(QApplication::translate("Dialog", "0", nullptr));
209 btn_eq->setText(QApplication::translate("Dialog", "=", nullptr));
210 btn_div->setText(QApplication::translate("Dialog", "/", nullptr));
211 } // retranslateUi
212
213 };
214
215 namespace Ui {
216 class Dialog: public Ui_Dialog {};
217 } // namespace Ui
218
219 QT_END_NAMESPACE
220
221 #endif // UI_DIALOG_H