GUISkin.horizontalSliderThumb

설명

Style used by default for the thumb that is dragged in GUI.HorizontalSlider controls.

The padding property is used to determine the size of the thumb.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float hSliderValue = 0.0F;
    public GUIStyle style;
    void OnGUI() {
        GUI.skin.horizontalSliderThumb = style;
        hSliderValue = GUILayout.HorizontalSlider(hSliderValue, 0.0F, 10.0F);
    }
}