QualitySettings.activeQualityLevelChanged

Делегирование, которое можно использовать для вызова пользовательского кода, когда Unity изменяет текущий Уровень Качества.

Параметрами являются предыдущий уровень качества и новый уровень качества.

using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    void Start()
    {
        QualitySettings.activeQualityLevelChanged += QualitySettings_activeQualityLevelChanged;
    }

    private void QualitySettings_activeQualityLevelChanged(int previousQuality, int currentQuality)
    {
        // Put the code that you want to execute everytime the Quality used is changed
        Debug.Log($"Quality Level has been changed from {QualitySettings.names[previousQuality]} to {QualitySettings.names[currentQuality]}");
    }

    void OnDestroy()
    {
        QualitySettings.activeQualityLevelChanged -= QualitySettings_activeQualityLevelChanged;
    }
}