無法訪問我的UI的小部件

Question

我有一個包含所有小部件的MainWindow類，我有一個MyClass類，我想要訪問放置在主窗口（MainWindow類）中的所有小部件。我怎樣才能做到這一點？我嘗試做這樣的（下面的代碼） - 但它給了我一堆錯誤：

MyClass.h:4: error: 'Ui' has not been declared 
MyClass.h:4: error: expected `)' before '*' token 
MyClass.h:6: error: 'Ui' has not been declared 
MyClass.h:6: error: ISO C++ forbids declaration of 'MainWindow' with no type 
MyClass.h:6: error: expected ';' before '*' token 

通過QtCreator創建這個主窗口 - 它是由Qt Creator中創建了一個非標準的GUI窗口。

// -=-=-=-=-=-=-=-=-=-=[ MyClass.h ]=-=-=-=-=-=-=-=-=-=-=-=-=- 
#include "MainWindow.h" 
class MyClass { 
    public: 
     MyClass(Ui::MainWindow *ui); 
    private: 
     Ui::MainWindow *ui; 
}; 

// -=-=-=-=-=-=-=-=-=-=[ MyClass.cpp ]=-=-=-=-=-=-=-=-=-=-=-=-=- 

#include "MyClass.h" 

MyClass::MyClass(Ui::MainWindow *ui){ 
    this->myUI = ui; // myUI is desclared as: Ui::MainWindow *myUI 
} 

// -=-=-=-=-=-=-=-=-=-=[ MainWindow.h ]=-=-=-=-=-=-=-=-=-=-=-=-=- 
.... 
namespace Ui { 
    class MainWindow; 
} 
class MainWindow : public QMainWindow { 
    Q_OBJECT  
    private: 
     Ui::MainWindow *ui; // this has done by Qt Creator 
    public: 
     MyClass *myClass; 
} 
// -=-=-=-=-=-=-=-=-=-=[ MainWindow.cpp ]=-=-=-=-=-=-=-=-=-=-=-=-=- 
#include "MainWindow.h" 
MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow) { 
    ui->setupUi(this); 
    myClass = new MyClass(ui); // my attempt 
} 

更新： 有在下面的評論由米色有用的代碼。它工作正常。但不是在我的情況:(當我嘗試從任何類（而不是從MainWindow.h）聲明MyClass時：

// - = - = - = - = - = - = - = - [MyGLWidget.h] = - = - = - = - = - = - = - = - = - = - = - = - = -

#include "MyClass.h" 
class MyGLWidget : public QGLWidget { 
    Q_OBJECT 
    public: 
    MyClass *myClass; 
} 

它不工作：

myclass.h:9: error: 'Ui' has not been declared 
myclass.h:9: error: expected `)' before '*' token 
myclass.h:12: error: 'Ui' has not been declared 
myclass.h:12: error: ISO C++ forbids declaration of 'MainWindow' with no type 
myclass.h:12: error: expected ';' before '*' token 

但是爲什麼？我在MyClass.h中聲明瞭「ui_mainwindow.h」

Answer 1

MyClass頭文件必須包含從用戶界面compi生成的頭文件LER。在你的情況下，它被稱爲ui_mainwindow.h。 MyClass的構造函數將採用Ui :: MainWindow參數並將其保存在私有成員變量中。

在MainWindow的構造函數中，您可以使用MainWindow ui初始化您的MyClass成員變量。

// = = - = - = - = - = - = - = - = - = - = = = = = - = = - = - = - = -

#include <ui_mainwindow.h> 

class MyClass 
{ 
public: 
    MyClass(Ui::MainWindow *ui); 

private: 
    Ui::MainWindow *myUi; 
}; 

// - = - = - = - = - = - = - = - = - = - = [myclass.cpp] = - = - = - = - = - = - = - = - = - = - = - = - = -

MyClass::MyClass(Ui::MainWindow *ui) 
{ 
    // Save the MainWindow-ui as private member of MyClass 
    this->myUi = ui; 
} 

// - = - = - = - = - = - = - = - = - = - = [MainWindow.h ] = - = - = - = - = - = - = - = - = - = - = - = - = -

#include <QMainWindow> 
#include "myclass.h" 

namespace Ui { 
class MainWindow; 
} 

class MainWindow : public QMainWindow 
{ 
    Q_OBJECT 

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

private: 
    Ui::MainWindow *ui; 
    MyClass *myClass; // myClass member dont't has to be public 
}; 

// - = - = - = - = - = - = - = - = - = - - [MainWindow.cpp ] = - = - = - = - = - = - = - = - = -

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

    // Initialize MyClass with the MainWindow-ui 
    myClass = new MyClass(ui); 
} 

MainWindow::~MainWindow() 
{ 
    delete myClass; 
    delete ui; 
}