Unity基础 GUI编程

　　脚本语言：C#

附上一张图说明Unity GUI编程中可用的控件：（可能有遗漏）

下面列出一些例子来说明：

1、Groups :

　　在固定Layout模式中起到组织可用项的功能，它让你在屏幕的一个区域中包含多个控件。把定义的控件放在GUI.BeginGroup()和 GUI.EndGroup()这对函数中间，所有控件的位置坐标都以Groups的0坐标为起点，假如更改了group坐标,那么内部的控件也会跟随改变。

示例代码：

using UnityEngine;
using System.Collections;

public class Test3 : MonoBehaviour {

    // Use this for initialization
    void Start () {
    }

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

    void OnGUI(){
        // 屏幕宽度和高度
        int screenWidth = Screen.width;
        int screenHeight = Screen.height;  

        // group组大小
        int groundWidth = 120;
        int groundHeight = 150;

        // group组初始位置
        int groupx = (screenWidth - groundWidth) / 2;
        int groupy = (screenHeight - groundHeight) / 2;  

        GUI.BeginGroup( new Rect(groupx,groupy,groundWidth,groundHeight));
        GUI.Box( new Rect(0,0,groundWidth,groundHeight), "Level Select");
        if(GUI.Button( new Rect(10,30,100,30),"Level 1"))
            Debug.Log("Level 1");
        if(GUI.Button( new Rect(10,70,100,30),"Level 2"))
            Debug.Log("Level 2");
        if(GUI.Button(new Rect(10,110,100,30),"Level 3"))
            Debug.Log("Level 3");
        GUI.EndGroup();  

        // 改变group坐标，group组的位置随之改变
        groupx = (screenWidth - groundWidth) / 4;
        groupy = (screenHeight - groundHeight) / 4;  

        GUI.BeginGroup( new Rect(groupx,groupy,groundWidth,groundHeight));
        GUI.Box( new Rect(0,0,groundWidth,groundHeight), "Level Select");  

        if(GUI.Button( new Rect(10,30,100,30),"Level 1"))
            Debug.Log("Level 1");
        if(GUI.Button( new Rect(10,70,100,30),"Level 2"))
            Debug.Log("Level 2");
        if(GUI.Button(new Rect(10,110,100,30),"Level 3"))
            Debug.Log("Level 3");
        GUI.EndGroup();
    }
}

Group

2、Button：

　　用来绘制响应单击事件的按钮；

（1）普通按钮示例代码：

using UnityEngine;
using System.Collections;

public class GUITest1 : MonoBehaviour {

    // Use this for initialization
    void Start () {
    }

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

    void OnGUI(){
        if ((Time.time % 2) < 1) {
            if( GUI.Button( new Rect(10,10,120,100),"Unity Button"))
                print("用户单击了按钮");
        }
    }
}

Button1

按钮会闪烁显示；

（2）带图标按钮：

对应Main Camera：

Icon是Test2脚本中定义的public Texture 变量，直接把图片拉至Icon处即可产生对应关系。

示例代码：

using UnityEngine;
using System.Collections;

public class Test2 : MonoBehaviour {

    public Texture icon;

    // Use this for initialization
    void Start () {
    }

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

    void OnGUI(){
        if( GUI.Button( new Rect(20,20,200,120), new GUIContent(icon) ) )
                print("用户单击了按钮");
    }
}

Button2

3、Box：

　　Box控件用来绘制带有边框背景的文字或图片。

示例代码：

using UnityEngine;
using System.Collections;

public class GUITest4 : MonoBehaviour {

    public Texture texture;

    // Use this for initialization
    void Start () {
    }

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

    void OnGUI()
    {
        // 指定为灰色颜色
        GUI.color = Color.gray;
        GUI.Box (new Rect (10, 10, Screen.width * 0.5f, Screen.height * 0.5f), "This is a title");
        GUI.Box (new Rect (150, 170, texture.width/4, texture.height/4), texture);
    }
}

Box

4、Window：

　　可拖动的窗口；

示例代码：

using UnityEngine;
using System.Collections;

public class GUITest5 : MonoBehaviour {

    public Rect windowRect0 = new Rect(20,20,150,0);

    // Use this for initialization
    void Start () {
    }

    // Update is called once per frame
    void Update () {
    }
    void OnGUI()
    {
        //渲染窗口ID为0
        windowRect0 = GUILayout.Window(0,windowRect0, DoMyWindow,"Draggable Window");
    }  

    void  DoMyWindow(int windowID)
    {
        GUILayout.Label("This is a draggable window!");
    }
}

window

5、GUILayout.beginHorizontal和guilayout.beginVertical

　　默认情况下,当使用GUILayout函数时所有的视图中的组件都会竖直排列。可以使用GUILayout.BeginHorizontal和GUILayout.EndHorizontall静态函数使控件相邻排放.每出现一次GUILayout.BeginVertical必须有对应的GUILayout.EndVertical与其对应,每出现一次GUILayout.BeginHorizontal则必须有对应的GUILayout.EndHorizontal与其对应；

示例代码：

using UnityEngine;
using System.Collections;

public class GUITest6 : MonoBehaviour {
    private string firstName = "First Name";
    private string lastName = "Last Name";
    private uint age = 0;
    private bool submitted = false;  

    private Rect windowRect0;  

    void Start(){
    }  

    void Update(){
    }

    void OnGUI()
    {
        var screenWidth = Screen.width;
        var screenHeight = Screen.height;  

        var windowWidth = 300;
        var windowHeight = 180;
        var windowX = (screenWidth - windowWidth) / 2;
        var windowY = (screenHeight - windowHeight) / 2;  

        //将窗口放置到屏幕中间
        windowRect0 = new Rect(windowX,windowY,windowWidth,windowHeight);  

        GUILayout.Window(0,windowRect0,UserForm,"User information");
    }  

    void UserForm(int windowID)
    {
        GUILayout.BeginVertical();  

        //first name
        GUILayout.BeginHorizontal();
        GUILayout.Label("First Name",GUILayout.Width(80));
        firstName = GUILayout.TextField(firstName);
        GUILayout.EndHorizontal();  

        //last name
        GUILayout.BeginHorizontal();
        GUILayout.Label("Last Name",GUILayout.Width(80));
        lastName = GUILayout.TextField(lastName);
        GUILayout.EndHorizontal();  

        //Age
        GUILayout.BeginHorizontal();
        GUILayout.Label("Age",GUILayout.Width(80));
        string ageText = GUILayout.TextField(age.ToString());
        uint newAge = 0;
        if( uint.TryParse(ageText, out newAge) )
        {
            age = newAge;
        }
        GUILayout.EndHorizontal();    

        if(GUILayout.Button("Submit"))
        {
            submitted = true;
        }
        if(GUILayout.Button("Reset"))
        {
            firstName = "First Name";
            lastName = "Last Name";
            age = 0;
            submitted = false;
        }
        if(submitted)
        {
            GUILayout.Label("submitted!");
        }
        GUILayout.EndVertical();
    }
}

Unity基础 GUI编程