TouchPhase

Description

描述手指触摸的阶段。

TouchPhase 是一个枚举类型，其中包含可能的手指触摸状态。这些状态表示手指在最近的帧更新时可以采取的操作。因为设备在整个“生命周期”中对触摸进行跟踪，所以触摸的开始和结束以及之间的移动可以在发生触摸的帧上报告。

//Attach this script to an empty GameObject
//Create some UI Text by going to Create>UI>Text.
//Drag this GameObject into the Text field to the Inspector window of your GameObject.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class TouchPhaseExample : MonoBehaviour
{
    public Vector2 startPos;
    public Vector2 direction;

    public Text m_Text;
    string message;

    void Update()
    {
        //Update the Text on the screen depending on current TouchPhase, and the current direction vector
        m_Text.text = "Touch : " + message + "in direction" + direction;

        // Track a single touch as a direction control.
        if (Input.touchCount > 0)
        {
            Touch touch = Input.GetTouch(0);

            // Handle finger movements based on TouchPhase
            switch (touch.phase)
            {
                //When a touch has first been detected, change the message and record the starting position
                case TouchPhase.Began:
                    // Record initial touch position.
                    startPos = touch.position;
                    message = "Begun ";
                    break;

                //Determine if the touch is a moving touch
                case TouchPhase.Moved:
                    // Determine direction by comparing the current touch position with the initial one
                    direction = touch.position - startPos;
                    message = "Moving ";
                    break;

                case TouchPhase.Ended:
                    // Report that the touch has ended when it ends
                    message = "Ending ";
                    break;
            }
        }
    }
}

Variables