QtQt之QList使用

相关资料：

https://blog.csdn.net/ligare/article/details/122687947

https://blog.csdn.net/jpchen609/article/details/4371594

https://download.csdn.net/download/zhujianqiangqq/85641106 CSDN代码包下载

实例代码：

.pro

 1 QT       += core gui
 2 
 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 4 
 5 CONFIG += c++11
 6 
 7 # The following define makes your compiler emit warnings if you use
 8 # any Qt feature that has been marked deprecated (the exact warnings
 9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12 
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
17 
18 SOURCES += \
19     main.cpp \
20     mainwindow.cpp
21 
22 HEADERS += \
23     mainwindow.h
24 
25 FORMS += \
26     mainwindow.ui
27 
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31 !isEmpty(target.path): INSTALLS += target

View Code

main.cpp

 1 #include "mainwindow.h"
 2 
 3 #include <QApplication>
 4 
 5 int main(int argc, char *argv[])
 6 {
 7     QApplication a(argc, argv);
 8     MainWindow w;
 9     w.show();
10     return a.exec();
11 }

View Code

mainwindow.h

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3 
 4 #include <QMainWindow>
 5 
 6 QT_BEGIN_NAMESPACE
 7 namespace Ui { class MainWindow; }
 8 QT_END_NAMESPACE
 9 
10 class MainWindow : public QMainWindow
11 {
12     Q_OBJECT
13 
14 public:
15     MainWindow(QWidget *parent = nullptr);
16     ~MainWindow();
17 
18 private slots:
19     void on_pushButton_4_clicked();
20 
21     void on_pushButton_3_clicked();
22 
23     void on_pushButton_2_clicked();
24 
25     void on_pushButton_clicked();
26 
27     void on_pushButton_8_clicked();
28 
29     void on_pushButton_7_clicked();
30 
31     void on_pushButton_10_clicked();
32 
33     void on_pushButton_9_clicked();
34 
35     void on_pushButton_5_clicked();
36 
37     void on_pushButton_6_clicked();
38 
39     void on_pushButton_11_clicked();
40 
41     void on_pushButton_13_clicked();
42 
43     void on_pushButton_12_clicked();
44 
45     void on_pushButton_15_clicked();
46 
47     void on_pushButton_16_clicked();
48 
49     void on_pushButton_14_clicked();
50 
51     void on_pushButton_17_clicked();
52 
53     void on_pushButton_18_clicked();
54 
55     void on_pushButton_20_clicked();
56 
57     void on_pushButton_19_clicked();
58 
59     void on_pushButton_21_clicked();
60 
61     void on_pushButton_22_clicked();
62 
63     void on_pushButton_23_clicked();
64 
65     void on_pushButton_24_clicked();
66 
67     void on_pushButton_25_clicked();
68 
69     void on_pushButton_26_clicked();
70 
71     void on_pushButton_27_clicked();
72 
73 private:
74     Ui::MainWindow *ui;
75     QList<QString> m_pList;// 定义成员
76 };
77 #endif // MAINWINDOW_H

View Code

mainwindow.cpp

  1 #include "mainwindow.h"
  2 #include "ui_mainwindow.h"
  3 
  4 MainWindow::MainWindow(QWidget *parent)
  5     : QMainWindow(parent)
  6     , ui(new Ui::MainWindow)
  7 {
  8     ui->setupUi(this);
  9 
 10     setWindowTitle(QStringLiteral("Qt之QList使用"));
 11 }
 12 
 13 MainWindow::~MainWindow()
 14 {
 15     delete ui;
 16 }
 17 
 18 // 添加元素方式1
 19 void MainWindow::on_pushButton_4_clicked()
 20 {
 21     // 会添加到末尾
 22     m_pList << "1" << "2" << "3";
 23     m_pList << "4";
 24 
 25 }
 26 // 添加元素方式2
 27 void MainWindow::on_pushButton_3_clicked()
 28 {
 29     // 添加到末尾 不会覆盖原来的
 30     m_pList.append("5");
 31     m_pList.push_back("6");
 32 }
 33 // 添加到头部
 34 void MainWindow::on_pushButton_2_clicked()
 35 {
 36     // 添加到头部 不会覆盖原来的
 37     m_pList.prepend("0");
 38     m_pList.push_front("00");
 39 }
 40 // 添加元素方式4
 41 void MainWindow::on_pushButton_clicked()
 42 {
 43     // 在位置4插入元素
 44     m_pList.insert(4, "I4");
 45 }
 46 // 插入元素
 47 void MainWindow::on_pushButton_8_clicked()
 48 {
 49     m_pList.swap(1,3);// 交换位置1和位置3的元素
 50 }
 51 // 移动位置
 52 void MainWindow::on_pushButton_7_clicked()
 53 {
 54     m_pList.move(1,4);// 把第一个元素移到第四个元素,其他元素顺移
 55 }
 56 // 查找元素
 57 void MainWindow::on_pushButton_10_clicked()
 58 {
 59     // return该元素的下标值;若有第二个参数则表示查找第几个这个字符
 60     ui->textEdit->append(QString::number(m_pList.indexOf("mm")));
 61 }
 62 // 最后一个元素
 63 void MainWindow::on_pushButton_9_clicked()
 64 {
 65      QString str = m_pList.back();//返回最后一个元素 同list.last();
 66      ui->textEdit->append(str);
 67 }
 68 // 第一个元素1
 69 void MainWindow::on_pushButton_5_clicked()
 70 {
 71     QString str = m_pList.front();
 72     ui->textEdit->append(str);
 73 }
 74 // 第一个元素2
 75 void MainWindow::on_pushButton_6_clicked()
 76 {
 77     QString str = m_pList.first();
 78     ui->textEdit->append(str);
 79 }
 80 // 是否存在
 81 void MainWindow::on_pushButton_11_clicked()
 82 {
 83     bool nExist = m_pList.contains("23");//列表是否有某元素 成功返回true 否则false
 84     ui->textEdit->append(QString::number(nExist));
 85 }
 86 // 总元素
 87 void MainWindow::on_pushButton_13_clicked()
 88 {
 89     int nCount = m_pList.count();
 90     ui->textEdit->append(QString::number(nCount));
 91 }
 92 // 总元素2
 93 void MainWindow::on_pushButton_12_clicked()
 94 {
 95     int nCount = m_pList.length();
 96     ui->textEdit->append(QString::number(nCount));
 97 }
 98 // 相同元素
 99 void MainWindow::on_pushButton_15_clicked()
100 {
101     int nCount = m_pList.count("4");// 列表中有几个这样的元素
102     ui->textEdit->append(QString::number(nCount));
103 }
104 // 删除元素
105 void MainWindow::on_pushButton_16_clicked()
106 {
107     QString str = m_pList.takeAt(2); //删除第3个 并返回结果
108     ui->textEdit->append(str);
109 }
110 // 删除元素2
111 void MainWindow::on_pushButton_14_clicked()
112 {
113     m_pList.removeAt(3);
114 }
115 // 修改元素值
116 void MainWindow::on_pushButton_17_clicked()
117 {
118     m_pList.replace(2,"bc");// 参数1 元素下标,参数2 修改的结果值
119 }
120 // 修改元素值2
121 void MainWindow::on_pushButton_18_clicked()
122 {
123     m_pList[2] = "opopo";
124 }
125 // 所引遍历元素
126 void MainWindow::on_pushButton_20_clicked()
127 {
128     QString str = "%1  %2  %3";
129     for(int i = 0; i < m_pList.size(); ++i)
130     {
131         // at()操作比操作符[]更快，因为它不需要深度复制
132         ui->textEdit->append(str.arg(m_pList[i]).arg(m_pList.at(i)).arg(m_pList.value(i)));
133     }
134 }
135 // 迭代遍历元素
136 void MainWindow::on_pushButton_19_clicked()
137 {
138     QString str = "it  %1";
139     QList<QString>::iterator it;
140     for(it = m_pList.begin(); it != m_pList.end(); ++it)
141     {
142         ui->textEdit->append(str.arg((*it)));
143     }
144 }
145 // 清空
146 void MainWindow::on_pushButton_21_clicked()
147 {
148     m_pList.clear();
149 }
150 // 迭代删除
151 void MainWindow::on_pushButton_22_clicked()
152 {
153     QString str = "it  %1";
154     QList<QString>::iterator it;
155     for(it = m_pList.begin(); it != m_pList.end(); ++it)
156     {
157         if((*it)== "00")
158         {
159             it = m_pList.erase(it);// 删除从起始位置到结束位置的元素
160         }
161         ui->textEdit->append(str.arg((*it)));
162     }
163 }
164 // 迭代区间删除
165 void MainWindow::on_pushButton_23_clicked()
166 {
167     QList<QString>::iterator it;
168     it = m_pList.begin();
169     it = m_pList.erase(it, it+3);
170 }
171 // 删除多个
172 void MainWindow::on_pushButton_24_clicked()
173 {
174     m_pList.removeAll("2");
175 }
176 // 删除最前值
177 void MainWindow::on_pushButton_25_clicked()
178 {
179     m_pList.removeFirst();
180 }
181 // 删除最后值
182 void MainWindow::on_pushButton_26_clicked()
183 {
184     m_pList.removeLast();
185 }
186 // 删除一个
187 void MainWindow::on_pushButton_27_clicked()
188 {
189     m_pList.removeOne("2");
190 }

View Code

mainwindow.ui

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <ui version="4.0">
  3  <class>MainWindow</class>
  4  <widget class="QMainWindow" name="MainWindow">
  5   <property name="geometry">
  6    <rect>
  7     <x>0</x>
  8     <y>0</y>
  9     <width>727</width>
 10     <height>433</height>
 11    </rect>
 12   </property>
 13   <property name="windowTitle">
 14    <string>MainWindow</string>
 15   </property>
 16   <widget class="QWidget" name="centralwidget">
 17    <layout class="QHBoxLayout" name="horizontalLayout">
 18     <item>
 19      <layout class="QVBoxLayout" name="verticalLayout">
 20       <item>
 21        <widget class="QLabel" name="label">
 22         <property name="text">
 23          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;特点:支持随机访问,基于索引,中间插入或移除项速度快速&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
 24         </property>
 25        </widget>
 26       </item>
 27       <item>
 28        <widget class="QLabel" name="label_2">
 29         <property name="text">
 30          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;注意:访问QList时,value(int i)查不到此值时会返回一个默认值0,at(int i)则会引起崩溃。&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
 31         </property>
 32        </widget>
 33       </item>
 34       <item>
 35        <widget class="QLabel" name="label_3">
 36         <property name="text">
 37          <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 38 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 39 p, li { white-space: pre-wrap; }
 40 &lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'SimSun'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
 41 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;源文:https://blog.csdn.net/ligare/article/details/122687947&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
 42         </property>
 43        </widget>
 44       </item>
 45       <item>
 46        <widget class="QLabel" name="label_4">
 47         <property name="text">
 48          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;原文:https://blog.csdn.net/jpchen609/article/details/4371594&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
 49         </property>
 50        </widget>
 51       </item>
 52       <item>
 53        <widget class="QTextEdit" name="textEdit"/>
 54       </item>
 55       <item>
 56        <layout class="QHBoxLayout" name="horizontalLayout_2">
 57         <item>
 58          <widget class="QPushButton" name="pushButton_4">
 59           <property name="toolTipDuration">
 60            <number>-14</number>
 61           </property>
 62           <property name="text">
 63            <string>添加元素方式1</string>
 64           </property>
 65          </widget>
 66         </item>
 67         <item>
 68          <widget class="QPushButton" name="pushButton_3">
 69           <property name="text">
 70            <string>添加元素方式2</string>
 71           </property>
 72          </widget>
 73         </item>
 74         <item>
 75          <widget class="QPushButton" name="pushButton_2">
 76           <property name="text">
 77            <string>添加到头部</string>
 78           </property>
 79          </widget>
 80         </item>
 81         <item>
 82          <widget class="QPushButton" name="pushButton">
 83           <property name="text">
 84            <string>插入元素</string>
 85           </property>
 86          </widget>
 87         </item>
 88         <item>
 89          <spacer name="horizontalSpacer_2">
 90           <property name="orientation">
 91            <enum>Qt::Horizontal</enum>
 92           </property>
 93           <property name="sizeHint" stdset="0">
 94            <size>
 95             <width>40</width>
 96             <height>20</height>
 97            </size>
 98           </property>
 99          </spacer>
100         </item>
101        </layout>
102       </item>
103       <item>
104        <layout class="QHBoxLayout" name="horizontalLayout_3">
105         <item>
106          <widget class="QPushButton" name="pushButton_8">
107           <property name="text">
108            <string>交换位置</string>
109           </property>
110          </widget>
111         </item>
112         <item>
113          <widget class="QPushButton" name="pushButton_7">
114           <property name="text">
115            <string>移动位置</string>
116           </property>
117          </widget>
118         </item>
119         <item>
120          <spacer name="horizontalSpacer">
121           <property name="orientation">
122            <enum>Qt::Horizontal</enum>
123           </property>
124           <property name="sizeType">
125            <enum>QSizePolicy::Expanding</enum>
126           </property>
127           <property name="sizeHint" stdset="0">
128            <size>
129             <width>40</width>
130             <height>20</height>
131            </size>
132           </property>
133          </spacer>
134         </item>
135        </layout>
136       </item>
137       <item>
138        <layout class="QHBoxLayout" name="horizontalLayout_5">
139         <item>
140          <widget class="QPushButton" name="pushButton_10">
141           <property name="text">
142            <string>查找元素</string>
143           </property>
144          </widget>
145         </item>
146         <item>
147          <widget class="QPushButton" name="pushButton_9">
148           <property name="text">
149            <string>最后一个元素</string>
150           </property>
151          </widget>
152         </item>
153         <item>
154          <widget class="QPushButton" name="pushButton_5">
155           <property name="text">
156            <string>第一个元素</string>
157           </property>
158          </widget>
159         </item>
160         <item>
161          <widget class="QPushButton" name="pushButton_6">
162           <property name="text">
163            <string>第一个元素2</string>
164           </property>
165          </widget>
166         </item>
167         <item>
168          <widget class="QPushButton" name="pushButton_11">
169           <property name="text">
170            <string>是否存在</string>
171           </property>
172          </widget>
173         </item>
174         <item>
175          <spacer name="horizontalSpacer_3">
176           <property name="orientation">
177            <enum>Qt::Horizontal</enum>
178           </property>
179           <property name="sizeHint" stdset="0">
180            <size>
181             <width>40</width>
182             <height>20</height>
183            </size>
184           </property>
185          </spacer>
186         </item>
187        </layout>
188       </item>
189       <item>
190        <layout class="QHBoxLayout" name="horizontalLayout_9">
191         <item>
192          <widget class="QPushButton" name="pushButton_13">
193           <property name="text">
194            <string>总元素</string>
195           </property>
196          </widget>
197         </item>
198         <item>
199          <widget class="QPushButton" name="pushButton_12">
200           <property name="text">
201            <string>总元素2</string>
202           </property>
203          </widget>
204         </item>
205         <item>
206          <widget class="QPushButton" name="pushButton_15">
207           <property name="text">
208            <string>相同元素</string>
209           </property>
210          </widget>
211         </item>
212         <item>
213          <spacer name="horizontalSpacer_4">
214           <property name="orientation">
215            <enum>Qt::Horizontal</enum>
216           </property>
217           <property name="sizeHint" stdset="0">
218            <size>
219             <width>40</width>
220             <height>20</height>
221            </size>
222           </property>
223          </spacer>
224         </item>
225        </layout>
226       </item>
227       <item>
228        <layout class="QHBoxLayout" name="horizontalLayout_11">
229         <item>
230          <widget class="QPushButton" name="pushButton_16">
231           <property name="text">
232            <string>删除元素</string>
233           </property>
234          </widget>
235         </item>
236         <item>
237          <widget class="QPushButton" name="pushButton_14">
238           <property name="text">
239            <string>删除元素2</string>
240           </property>
241          </widget>
242         </item>
243         <item>
244          <widget class="QPushButton" name="pushButton_27">
245           <property name="text">
246            <string>删除一个</string>
247           </property>
248          </widget>
249         </item>
250         <item>
251          <widget class="QPushButton" name="pushButton_24">
252           <property name="text">
253            <string>删除多个</string>
254           </property>
255          </widget>
256         </item>
257         <item>
258          <widget class="QPushButton" name="pushButton_25">
259           <property name="text">
260            <string>删除最前值</string>
261           </property>
262          </widget>
263         </item>
264         <item>
265          <widget class="QPushButton" name="pushButton_26">
266           <property name="text">
267            <string>删除最后值</string>
268           </property>
269          </widget>
270         </item>
271         <item>
272          <widget class="QPushButton" name="pushButton_21">
273           <property name="text">
274            <string>清空</string>
275           </property>
276          </widget>
277         </item>
278         <item>
279          <widget class="QPushButton" name="pushButton_22">
280           <property name="text">
281            <string>迭代删除</string>
282           </property>
283          </widget>
284         </item>
285         <item>
286          <widget class="QPushButton" name="pushButton_23">
287           <property name="text">
288            <string>迭代区间删除</string>
289           </property>
290          </widget>
291         </item>
292         <item>
293          <spacer name="horizontalSpacer_5">
294           <property name="orientation">
295            <enum>Qt::Horizontal</enum>
296           </property>
297           <property name="sizeHint" stdset="0">
298            <size>
299             <width>40</width>
300             <height>20</height>
301            </size>
302           </property>
303          </spacer>
304         </item>
305        </layout>
306       </item>
307       <item>
308        <layout class="QHBoxLayout" name="horizontalLayout_13">
309         <item>
310          <widget class="QPushButton" name="pushButton_17">
311           <property name="text">
312            <string>修改元素值</string>
313           </property>
314          </widget>
315         </item>
316         <item>
317          <widget class="QPushButton" name="pushButton_18">
318           <property name="text">
319            <string>修改元素值2</string>
320           </property>
321          </widget>
322         </item>
323         <item>
324          <spacer name="horizontalSpacer_6">
325           <property name="orientation">
326            <enum>Qt::Horizontal</enum>
327           </property>
328           <property name="sizeHint" stdset="0">
329            <size>
330             <width>40</width>
331             <height>20</height>
332            </size>
333           </property>
334          </spacer>
335         </item>
336        </layout>
337       </item>
338       <item>
339        <layout class="QHBoxLayout" name="horizontalLayout_17">
340         <item>
341          <widget class="QPushButton" name="pushButton_20">
342           <property name="text">
343            <string>所引遍历元素</string>
344           </property>
345          </widget>
346         </item>
347         <item>
348          <widget class="QPushButton" name="pushButton_19">
349           <property name="text">
350            <string>迭代遍历元素</string>
351           </property>
352          </widget>
353         </item>
354         <item>
355          <spacer name="horizontalSpacer_7">
356           <property name="orientation">
357            <enum>Qt::Horizontal</enum>
358           </property>
359           <property name="sizeHint" stdset="0">
360            <size>
361             <width>40</width>
362             <height>20</height>
363            </size>
364           </property>
365          </spacer>
366         </item>
367        </layout>
368       </item>
369      </layout>
370     </item>
371    </layout>
372   </widget>
373  </widget>
374  <resources/>
375  <connections/>
376 </ui>

View Code

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原文地址：https://www.cnblogs.com/FKdelphi/p/16375918.html