View Installer

The View Installer is generated once for each assembly that defines one or more View classes.
By executing ViewInstaller.Install(), all View classes in the assembly are registered with the View Provider.
Registered View classes can then be referenced by their UxmlGuid.

Install

This method registers all View classes in the assembly with the View Provider.
You must call this method explicitly. If you use properties such as ListView Property that require specifying a View class by Guid, you need to call ViewInstaller.Install() in advance for the assembly containing the specified View class.
It is recommended to call ViewInstaller.Install() in HaikaraManager.Initialize().

View Provider

The View Provider is used to retrieve View classes by their Guid.
By calling ViewInstaller.Install(), all View class Guids in the installer’s assembly are registered and can be accessed.
This is useful when you need to dynamically access Views as with ListView Property and TabView Property, or when associating a View class with existing UI, such as a template in .uxml.
You can also use it in combination with the UI Catalog.