Apply customization when the new project is loaded

Question

I'm trying to apply customization settings to QGIS consistently at two moments:

1. When QGIS opens;
2. When new project (with some layers) is loaded.

My code:

from qgis.utils import iface
from qgis.core import QgsProject

def customize():
    #some
    #customization
    #code

iface.initializationCompleted.connect(customize)
QgsProject.instance().legendLayersAdded.connect(customize)

At first moment code works well. But legendLayersAdded signal works only after I'm adding any other layer to an already loaded project.

Is there a signal emitted after any project (new one or existing with some layers) was loaded into QGIS?

Answer 1

I looked a bit more into the documentation, and apart for QgsProject, there are also QgisInterface signals:

newProjectCreated Emitted when starting an entirely new project note This is similar to projectRead(); plug-ins might want to be notified that they’re in a new project.

projectRead Emitted when a project file is successfully read note This is useful for plug-ins that store properties with project files.

Complete description e.g.: https://qgis.org/pyqgis/3.2/gui/other/QgisInterface.html