我如何在 Unity3D 中进行触摸工作？

Question

I'm making an Android app with Unity3D and it works with click detection already, but not with touch. I need touch though for multitouch detection.

What I want: I have my player and 2 images of arrows. One arrow points right and one left. When I touch the left arrow the player should start moving left, when I touch the right arrow the player should start moving right.

But how do I detect which arrow is touched (and held)? All the code I found on Google is too old and not working anymore.

I'm working with C# scripts and it's a 2D game.

Answer 1

Klausar, what you're looking for is .........

A BUTTON (!!!)

it's that easy!

1. click "add Canvas". (You very likely want "scale to screen size" - select that option.)

2. click "add Button".

3. there is no "three" .. go drinking.

In your code, have a routine like this for the right-side button

public void UserClickedRight()
 {
 Debug.Log("click right whoo!");
 }

and have a similar routine for the left-side button.

1. Go to your Button in the editor.

2. Simply drag the script to it and select UserClickedRight !!

You actually do not have to program buttons from scratch :)

This is a basic mechanism of Unity - drag a game object to a "slot" for it in the Editor.

(The game object you drag, has the script in question on it.)

You DO NOT need to go to the level of touch handling to achieve a button!

---

Now you ask, what about "when holding down on the button"?

It's very easy, you just need to know a couple of things about the Unity "event" system.

In Button , Unity have done all the work for "OnClick":

Since "click" is common, they put that one right in the Inspector panel for you for convenience.

The good news is that Button has many more events you can use .

http://docs.unity3d.com/ScriptReference/UI.Button.html

My guess is you want to use OnPointerDown and OnPointerUp in your case.

To use the other events (which Unity did not bother putting in the Inspector panel) is very simple, you just

1, make a script that references the events you want,

and,

2, you put that script ON the button in question ...

it's that easy.

Step by step explanation:

You're going to be using Unity's event system, so:

  using UnityEngine.EventSystems;

Next. You know that a script normally starts like this...

 public class FancyButton:MonoBehaviour

The "MonoBehaviour" part just means that it's ac# script which will be "driving a GameObject".

In this case we have to further alert the engine that you will be using those click events. So you add this.

,IPointerDownHandler,IPointerUpHandler

So far we have this

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

public class FancyButton:MonoBehaviour,IPointerDownHandler,IPointerUpHandler
    {

Now the easy part.

You just type the two routines which Unity will run for you, when, those things happen.

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

public class FancyButton:MonoBehaviour,IPointerDownHandler,IPointerUpHandler
{
  public void OnPointerDown(PointerEventData data)
  {
      Debug.Log("holy! someone put the pointer down!")
  }

  public void OnPointerUp(PointerEventData data)
  {
      Debug.Log("whoa! someone let go!")
  }
}

Now all you have to do is drop that script on the Button. Done!

You can put that script on any button, where, you need that functionality.

Next, click on Obi-wan to see where we're at so far!

Finally, it sounds like you want to do something "when the button is being held down". That's just a general programming issue - you'd have a boolean which you turn on and off as the button goes up and down . Let's do it.

    using UnityEngine;
    using System.Collections;
    using UnityEngine.EventSystems;
    
    public class FancyButton:MonoBehaviour,IPointerDownHandler,IPointerUpHandler
        {
        [System.NonSerialized] public bool mouseIsDownRightNow;
        
        public void OnPointerDown(PointerEventData data)
            {
            mouseIsDownRightNow = true;
            }
        
        public void OnPointerUp(PointerEventData data)
            {
            mouseIsDownRightNow = false;
            }
        }

You could access that variable from another script, or whatever you want.

Add the following if you want to run a routine while the button is down:

    void Update()
        {
        if (buttonIsDownRightNow) WhileButtonIsDown();
        }
    private void WhileButtonIsDown()
        {
        Debug.Log("THE BUTTON IS DOWN! WHOA!");
        }
    

Try that and watch the console as you hold the button down and up.

Here's an example of something like continually increasing a value while the button is down:

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

public class FancyButton:MonoBehaviour,IPointerDownHandler,IPointerUpHandler
    {
    [System.NonSerialized] public bool buttonIsDownRightNow;
    private int countSomething;
    
    public void OnPointerDown(PointerEventData data)
        {
        buttonIsDownRightNow = true;
        }
    
    public void OnPointerUp(PointerEventData data)
        {
        buttonIsDownRightNow = false;
        }
    
    private void WhileButtonIsDown()
        {
        ++countSomething;
        }
    
    void Update()
        {
        if (buttonIsDownRightNow) WhileButtonIsDown();
        
        Debug.Log("value is now " +countSomething.ToString());
        }
    }

That's all there is to it. Once you really understand events in Unity, there is not much more to learn about Unity.

The only other important topics are Mecanim, shader writing, touch, coroutines, threading, PhysX, native plugins, sprites, networking, dynamic mesh, navigation, VR, AR, animation, inverse kinematics, particles, terrain, IAP, lighting, baking, shadows, MMP, character controllers, and audio. Enjoy!

Answer 2

You should firsty read this . What you are trying to do is actually simple:

foreach (Touch touch in Input.touches) {

    if (touch.phase == TouchPhase.Moved || touch.phase == TouchPhase.Stationary)
        if (guiTexture1.HitTest(touch.position)) {

            // Maybe move left
        }
        if (guiTexture2.HitTest(touch.position)) {

            // Maybe move right
        }
    }
}

Edit 1: this code now checks which image is being pressed
Edit 2: Added multitouch support