using UnityEngine;
using System.Collections;

public class TestUILabel : MonoBehaviour {

    public UILabel label;
    public int hspacing = 2;
    public int vspacing = 2;

	// Use this for initialization
	void Start () {
        label.font.horizontalSpacing = hspacing;//设置字间距
        label.font.verticalSpacing = vspacing;//设置行间距
	}
}

运行效果