我的 If-Statement 运行时没有得到所需的输入？

Question

Touch touchForThrow;

void Update()
    {
        if (Input.touchCount > 0)
            touchForThrow = Input.GetTouch(1);

        if (touchForThrow.phase == TouchPhase.Began)
        {
            Debug.Log(Input.touchCount);
        }
    }

The second If-statement is running without a touch imput. touchForThrow.phase == TouchPhase.Began should not be possible, even the Debug.Log says that 0 touches are identified, but it still runs the statement.

Answer 1

You are waiting for one touch but are trying to get the second one! Remember that indices in c# are 0-based!

Also Touch is a struct and thereby always has a default value. Even if your first if is not true it already has a dummy touch value where the phase might be Began by default.

It should probably rather be

if (Input.touchCount > 0)
{
    touchForThrow = Input.GetTouch(0);

    if(touchForThrow.phase == TouchPhase.Began)
    {
        Debug.Log(Input.touchCount);
    }
 }

---

If you want the second touch you should probably rather first check if there are at least two touches

if(Input.touchCount > 1)

Answer 2

TouchPhase.Began is the default value of phase. The code worked properly, after nesting the second If-statement in the first one.