blocks|key|3061242|text|您需要使用.ui文件中的UI设置对话框。Qt+uic编译器从您的.ui文件生成一个头文件，您需要将该文件包含在代码中。假设您的.ui文件名为about.ui，对话框名为About，那么uic将创建文件ui_about.h，其中包含一个类Ui_About。有不同的方法来设置你的UI，最简单的是你可以这样做|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3061243|#include+"ui_about.h"

...

void+MainWindow::on_actionAbout_triggered()
{
++++about+=+new+QDialog(0,0);

++++Ui_About+aboutUi;
++++aboutUi.setupUi(about);

++++about->show();
}|code-block|syntax|javascript|3061244|一种更好的方法是使用继承，因为它更好地封装了对话框，这样您就可以在子类中实现特定于特定对话框的任何功能：|3061245|AboutDialog.h:|BOLD|3061246|#include+<QDialog>
#include+"ui_about.h"

class+AboutDialog+:+public+QDialog,+public+Ui::About+{
++++Q_OBJECT

public:
++++AboutDialog(+QWidget+*+parent+=+0);
};|3061247|AboutDialog.cpp:|3061248|AboutDialog::AboutDialog(+QWidget+*+parent)+:+QDialog(parent)+{

++++setupUi(this);

++++//+perform+additional+setup+here+...
}|3061249|使用：|3061250|#include+"AboutDialog.h"

...

void+MainWindow::on_actionAbout_triggered()+{
++++about+=+new+AboutDialog(this);
++++about->show();
}|3061251|在任何情况下，重要的代码都是调用setupUi()方法。|3061252|BTW:在上面的代码中你的对话框是非模态的。要显示模式对话框，可以将对话框的windowModality标志设置为Qt::ApplicationModal，或者使用exec()代替show()。|3061253|entityMap^0|5|3|N|3|W|3|1R|3|1Y|8|2C|5|2K|3|2S|A|3A|8|0|0|0|0|E|0|0|0|G|0|0|0|3|0|0|G|9|0|0|B|12|E|1L|K|2A|6|2I|6|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1O|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1P|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1Q|8|@$9|1R|A|1S|B|O]]|D|@]|E|$]]|$1|P|3|Q|5|H|7|1T|8|@]|D|@]|E|$I|J]]|$1|R|3|S|5|6|7|1U|8|@$9|1V|A|1W|B|O]]|D|@]|E|$]]|$1|T|3|U|5|H|7|1X|8|@]|D|@]|E|$I|J]]|$1|V|3|W|5|6|7|1Y|8|@$9|1Z|A|20|B|O]]|D|@]|E|$]]|$1|X|3|Y|5|H|7|21|8|@]|D|@]|E|$I|J]]|$1|Z|3|10|5|6|7|22|8|@$9|23|A|24|B|C]]|D|@]|E|$]]|$1|11|3|12|5|6|7|25|8|@$9|26|A|27|B|O]|$9|28|A|29|B|C]|$9|2A|A|2B|B|C]|$9|2C|A|2D|B|C]|$9|2E|A|2F|B|C]]|D|@]|E|$]]|$1|13|3|-4|5|6|7|2G|8|@]|D|@]|E|$]]]|14|$]]

You need to setup the dialog with the UI you from your <code>.ui</code> file. The Qt <code>uic</code> compiler generates a header file from your <code>.ui</code> file which you need to include in your code. Assumed that your <code>.ui</code> file is called <code>about.ui</code>, and the Dialog is named <code>About</code>, then <code>uic</code>creates the file <code>ui_about.h</code>, containing a class <code>Ui_About</code>. There are different approaches to setup your UI, at simplest you can do

<pre><code>#include "ui_about.h"

...

void MainWindow::on_actionAbout_triggered()
{
 about = new QDialog(0,0);

 Ui_About aboutUi;
 aboutUi.setupUi(about);

 about-&gt;show();
}
</code></pre>

A better approach is to use inheritance, since it encapsulates your dialogs better, so that you can implement any functionality specific to the particular dialog within the sub class:

AboutDialog.h:

<pre><code>#include &lt;QDialog&gt;
#include "ui_about.h"

class AboutDialog : public QDialog, public Ui::About {
 Q_OBJECT

public:
 AboutDialog( QWidget * parent = 0);
};
</code></pre>

AboutDialog.cpp:

<pre><code>AboutDialog::AboutDialog( QWidget * parent) : QDialog(parent) {

 setupUi(this);

 // perform additional setup here ...
}
</code></pre>

Usage:

<pre><code>#include "AboutDialog.h"

...

void MainWindow::on_actionAbout_triggered() {
 about = new AboutDialog(this);
 about-&gt;show();
}
</code></pre>

In any case, the important code is to call the <code>setupUi()</code> method.

BTW: Your dialog in the code above is non-modal. To show a modal dialog, either set the <code>windowModality</code> flag of your dialog to <code>Qt::ApplicationModal</code> or use <code>exec()</code> instead of <code>show()</code>.

blocks|key|206936|text|对于模式对话框，应该使用QDialogs的exec()方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|206937|about+=+new+QDialog(0,+0);

//+The+method+does+not+return+until+user+closes+it.
about->exec();

//+In+this+point,+the+dialog+is+closed.|code-block|syntax|javascript|206938|Docs说：|206939|206940|显示模式对话框最常见的方法是调用它的exec()函数。当用户关闭对话框时，exec()将提供一个有用的返回值。|blockquote|206941|206942|206943|206944|另一种方式:+You+‘t+need+a+modal对话框。让对话框显示无模式，并将其accepted()和rejected()信号连接到适当的插槽。然后，您可以将所有代码放在接受槽中，而不是直接将它们放在show()之后。因此，使用这种方式，您实际上不需要模式对话框。|BOLD|206945|entityMap|0|LINK|mutability|MUTABLE|url|http://doc.qt.io/qt-4.8/qdialog.html#exec|1|http://doc.qt.io/qt-4.8/qdialog.html^0|L|6|L|6|0|0|0|0|4|1|0|0|I|6|11|6|0|0|0|0|B|2|17|A|1I|A|2V|6|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|F|3|G|5|H|7|1C|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|M|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1Q|8|@$9|1R|A|1S|B|V]|$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]]]

For modal dialogs, you should use <a href="http://doc.qt.io/qt-4.8/qdialog.html#exec" rel="noreferrer"><code>exec()</code></a> method of QDialogs.

<pre><code>about = new QDialog(0, 0);

// The method does not return until user closes it.
about-&gt;exec();

// In this point, the dialog is closed.
</code></pre>

<a href="http://doc.qt.io/qt-4.8/qdialog.html" rel="noreferrer">Docs</a> say:

<blockquote>
 The most common way to display a modal dialog is to call its <code>exec()</code> function. When the user closes the dialog, <code>exec()</code> will provide a useful return value.
</blockquote>

<hr>

Alternative way: You don't need a modal dialog. Let the dialog show modeless and connect its <code>accepted()</code> and <code>rejected()</code> signals to appropriate slots. Then you can put all your code in the accept slot instead of putting them right after <code>show()</code>. So, using this way, you wouldn't actually need a modal dialog.

I want to make a simple 'About' modal dialog, called from Help->About application menu. I've created a modal dialog window with QT Creator (.ui file). 

What code should be in menu 'About' slot?

Now I have this code, but it shows up a new modal dialog (not based on my about.ui):

<pre><code>void MainWindow::on_actionAbout_triggered()
{
 about = new QDialog(0,0);
 about-&gt;show();
}
</code></pre>

Thanks!

Qt show modal dialog (.ui) on menu item click

我想创建一个简单的“关于”模式对话框，从“帮助”->“关于应用程序”菜单调用。我已经用QT Creator创建了一个模式对话框窗口(.ui文件)。菜单“关于”插槽中应该有什么代码？现在我有了这段代码，但它显示了一个新的模式对话框(不是基于我的about.ui)：void MainWindow::on_actionAbo...

问Qt在菜单项上显示模式对话框(.ui)单击
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