Input.GetTouch

参数

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Touch 结构中的触摸详细信息。

描述

调用 Input.GetTouch 以获取 Touch 结构。

Input.GetTouch 为所选的屏幕触摸操作（例如来自手指或触笔）返回 Touch。Touch 描述触摸屏。index 参数选择屏幕触摸操作。

Input.touchCount 提供当前屏幕触摸操作的次数。如果 Input.touchCount 大于零，GetTouch index 设置要检查哪些屏幕触摸操作。Touch 返回包含屏幕触摸操作详细信息的 /struct/。每次触摸屏幕，都会使 Input.touchCount 增大。

GetTouch 返回 Touch 结构。可以用零来获得首次屏幕触摸。例如，Touch 包含 position（单位为像素）。

未分配临时变量。

using UnityEngine;
using System.Collections;
using UnityEngine.iOS;

// Input.GetTouch example.
//
// Attach to an origin based cube.
// A screen touch moves the cube on an iPhone or iPad.
// A second screen touch reduces the cube size.

public class ExampleClass : MonoBehaviour
{
    private Vector3 position;
    private float width;
    private float height;

    void Awake()
    {
        width = (float)Screen.width / 2.0f;
        height = (float)Screen.height / 2.0f;

        // Position used for the cube.
        position = new Vector3(0.0f, 0.0f, 0.0f);
    }

    void OnGUI()
    {
        // Compute a fontSize based on the size of the screen width.
        GUI.skin.label.fontSize = (int)(Screen.width / 25.0f);

        GUI.Label(new Rect(20, 20, width, height * 0.25f),
            "x = " + position.x.ToString("f2") +
            ", y = " + position.y.ToString("f2"));
    }

    void Update()
    {
        // Handle screen touches.
        if (Input.touchCount > 0)
        {
            Touch touch = Input.GetTouch(0);

            // Move the cube if the screen has the finger moving.
            if (touch.phase == TouchPhase.Moved)
            {
                Vector2 pos = touch.position;
                pos.x = (pos.x - width) / width;
                pos.y = (pos.y - height) / height;
                position = new Vector3(-pos.x, pos.y, 0.0f);

                // Position the cube.
                transform.position = position;
            }

            if (Input.touchCount == 2)
            {
                touch = Input.GetTouch(1);

                if (touch.phase == TouchPhase.Began)
                {
                    // Halve the size of the cube.
                    transform.localScale = new Vector3(0.75f, 0.75f, 0.75f);
                }

                if (touch.phase == TouchPhase.Ended)
                {
                    // Restore the regular size of the cube.
                    transform.localScale = new Vector3(1.0f, 1.0f, 1.0f);
                }
            }
        }
    }
}

第二个示例：

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public GameObject projectile;
    public GameObject clone;

    void Update()
    {
        for (int i = 0; i < Input.touchCount; ++i)
        {
            if (Input.GetTouch(i).phase == TouchPhase.Began)
            {
                clone = Instantiate(projectile, transform.position, transform.rotation) as GameObject;
            }
        }
    }
}

第三个示例：

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public GameObject particle;
    void Update()
    {
        for (int i = 0; i < Input.touchCount; ++i)
        {
            if (Input.GetTouch(i).phase == TouchPhase.Began)
            {
                // Construct a ray from the current touch coordinates
                Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(i).position);

                // Create a particle if hit
                if (Physics.Raycast(ray))
                {
                    Instantiate(particle, transform.position, transform.rotation);
                }
            }
        }
    }
}