C++ 无法在 Qt 样式表中设置背景图像
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Unable to set the background image in Qt Stylesheet
提问by Owen
I'm running my Qt app through command line with a parameter -stylesheet. The styles for the controls work but not when I'm trying to load a background image for the MainWindow. I tried:
我正在通过带有参数样式表的命令行运行我的 Qt 应用程序。控件的样式有效，但在我尝试为 MainWindow 加载背景图像时无效。我试过：
QMainWindow{
background-image:url(:image_256_8bit_latest_back.png);
}
Also tried removing the ":" in background, but doesn't make a difference. Can somebody tell me what's wrong with this StyleSheet?
还尝试删除背景中的“：”，但没有任何区别。有人能告诉我这个样式表有什么问题吗？
回答by Jér?me
Where is located the image you are trying to use ?
您尝试使用的图像位于何处？
Did you put it as a resourceof your application ?
你把它作为你的应用程序的资源了吗？
If you want to use an image which is part of your resources, you should have a resource file (*.qrc) in your project. This file should contain something like this :
如果您想使用属于资源一部分的图像，您的项目中应该有一个资源文件 ( *.qrc)。该文件应包含如下内容：
<RCC>
<qresource prefix="/images">
<file alias="sunset.jpg">sunset.jpg</file>
</qresource>
</RCC>
Then, you could write this code in the constructor of your QMainWindow:
然后，您可以在您的构造函数中编写此代码QMainWindow：
setStyleSheet("background-image: url(:/images/sunset.jpg);");
If you don't want to use the Qt resource system, you can just put the path to your image on your disk :
如果您不想使用Qt 资源系统，您可以将图像的路径放在磁盘上：
setStyleSheet("background-image: url(res/images/sunset.jpg);");
Be careful though if you are using a relative path : Qt will start from the current location, which might change, particularly if you are developping with Qt Creator.
但如果您使用的是相对路径，请小心：Qt 将从当前位置开始，这可能会改变，特别是如果您使用Qt Creator进行开发。
With Qt Creator, when you run your app in debug mode, the current path is in debug/. When you run your app in release mode, the current path is in release/(unless you changed the settings).
使用Qt Creator，当您在调试模式下运行您的应用程序时，当前路径在debug/. 当您在发布模式下运行您的应用程序时，当前路径在release/（除非您更改了设置）。
回答by koan
Clearly there is a problem with the path to your image. Try using an absolute path to verify the image is loaded by QT and working.
显然，您的图像路径存在问题。尝试使用绝对路径来验证图像是否由 QT 加载并正常工作。
