QLabel: set color of text and background

Change the text color and background color of a QLabel:

QLabel* pLabel = new QLabel;
pLabel->setStyleSheet("QLabel { background-color : red; color : blue; }");

 using Qt Style Sheets and change the QPalette colors of your QLabel,  get different results on different platforms and styles.

Qt documentation states :

    Using a QPalette is not guaranteed to work for all styles, because style authors are restricted by the different platforms’ guidelines and by the native theme engine.

Do something like this :

QPalette palette = ui->pLabel->palette();
palette.setColor(ui->pLabel->backgroundRole(), Qt::yellow);
palette.setColor(ui->pLabel->foregroundRole(), Qt::yellow);
ui->pLabel->setPalette(palette);

Use  this:

QPalette,

must set setAutoFillBackground(true); to enable background color

QPalette sample_palette;
sample_palette.setColor(QPalette::Window, Qt::white);
sample_palette.setColor(QPalette::WindowText, Qt::blue);
 
sample_label->setAutoFillBackground(true);
sample_label->setPalette(sample_palette);
sample_label->setText("What ever text");

It works on Windows and Ubuntu, have not played with any other OS.

For more information just try this link

QPalette, color role section for more details

Easy method:

     The setting RGBA colors (that is, RGB color with an Alpha value for transparency) for color display labels in my painting application.

myLabel.setStyleSheet(“QLabel { background-color : %s”%color.name())

where color is an RGBA color.

  So, my dirty solution was to extend QLabel and override paintEvent() method filling its bounding rect.

Today, I have

open up the qt-assistant and read the style reference properties list.  Example to  states the following:

QLineEdit { background-color: rgb(255, 0, 0) }

The given code is example:

myLabel= QLabel()
myLabel.setAutoFillBackground(True) # This is important!!
color = QtGui.QColor(233, 10, 150)
alpha = 140
values = "{r}, {g}, {b}, {a}".format(r = color.red(),
                                     g = color.green(),
                                     b = color.blue(),
                                     a = alpha
                    
myLabel.setStyleSheet("QLabel { background-color: rgba("+values+"); }")

setAutoFillBackground() set  is  worked.