UI的拖拽操作，也是常见的功能。

导出资源

代码实现

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using FairyGUI;
/*
 * Author:W
 * 拖拽操作
 */
public class DragAndDropTest : MonoBehaviour {

	private GComponent root;

	private GButton btnA;

	private GButton btnB;
	private GButton btnC;

	private GButton btnD;

	void Awake()
	{
		UIPackage.AddPackage("UI/Basics");
	}

	// Use this for initialization
	void Start () {
		root = this.GetComponent<UIPanel>().ui;

		//1.自由拖拽
		btnA = root.GetChild("a").asButton;
		btnA.draggable = true;

		//2.拖动赋值
		btnB = root.GetChild("b").asButton;
		btnB.draggable = true;
		btnB.onDragStart.Add((EventContext context) => {
			//取消之前的拖拽，开始一个新的
			context.PreventDefault();
			DragDropManager.inst.StartDrag(btnB, btnB.icon, btnB.icon, (int)context.data);
		});

		btnC = root.GetChild("c").asButton;
		btnC.icon = null;
		btnC.onDrop.Add((EventContext context) => {
			btnC.icon = (string)context.data;
		});


		//3.限制边界的拖动
		GObject bounds = root.GetChild("n7");
		Rect rect = bounds.TransformRect(new Rect(0, 0, bounds.width, bounds.height), root);

		btnD = root.GetChild("d").asButton;
		btnD.draggable = true;
		btnD.dragBounds = rect;

	}
	
	// Update is called once per frame
	void Update () {
		
	}
}

运行结果如下