如何移动一个精灵，将其更改为另一个精灵，然后再次移动它？

Question

我试图将一个精灵保持在屏幕中央几秒钟，然后将其平滑地向左移动，直到它离开屏幕，然后我想要一个不同的精灵，它应该从屏幕右侧移动到屏幕右侧屏幕中心；所有这一切都在无限循环中。一个非常清楚的例子：public Sprite Pokemon_0;public Sprite Pokemon_1;    void Start()    {    GetComponent<SpriteRenderer>().sprite = Pokemon_0;}    void Update()    {    if (transform.position.x >= -80)     {        transform.Translate(-1f,0f,0f);    }    else    {        GetComponent<SpriteRenderer>().sprite = Pokemon_1;             }以下是据我所知。它将精灵平滑地向左移动，直到它离开屏幕，然后将精灵更改为其他精灵。我很新，所以如果有人可以编写一个简单的脚本，那将会非常有帮助。我也在努力学习，因此将不胜感激。

Answer 1

// The [Range()] attribute will make `speed` show up with a slider in the inspector

[Range(0.1f, 5)]

public float speed = 3;

public Sprite[] Pokemons;

private SpriteRenderer sr;

private float worldMiddleX;

private float worldLeftX;

private float worldRightX;

private int currentPokemon = 0;

private float secondsInMiddle = 3f;

void Start()

{

    sr = GetComponent<SpriteRenderer>();

    sr.sprite = Pokemons[currentPokemon];

    // Find out what X's in the world the left edge, middle & right of the screen is,

    // if you have a 1920x1080 resolution Screen.width will be 1920. But we don't

    // want to position us at x = 1920, because that is FAR away

    // So we need to figure out where in the GAME world, our screen right edge is

    worldMiddleX = Camera.main.ScreenToWorldPoint(new Vector2(Screen.width / 2, 0f)).x;

    // +100 & -100 because we want it to go outside of the screen a little bit

    // These should be tweaked based on the sprite width

    // Can be done dynamically / programatically too. Their width is in

    // Pokemons[0].rect.width

    worldLeftX = Camera.main.ScreenToWorldPoint(new Vector2(-100, 0f)).x;

    worldRightX = Camera.main.ScreenToWorldPoint(new Vector2(Screen.width + 100, 0f)).x;

    // Start our endlessly looping Coroutine, which will take care of 

    // 1. Moving to the middle.

    // 2. Waiting in middle

    // 3. Moving outside of screen to the left & resetting position

    // 4. Repeat

    StartCoroutine(SlideLeftButWaitMiddleEndlesslyLoop());

}

/*

* Changed from void to IEnumerator to get access to the

* `yield` keyword, which will let us pause execution for X seconds.

* If you do this with a normal method, you will need to invoke it with

* `StartCoroutine()` as it becomes a Coroutine, which will execute in 

* an asynchronous manner

*/

IEnumerator SlideLeftButWaitMiddleEndlesslyLoop()

{

    while (true)

    {

        // yield return *Coroutine* will make sure that the code doesn't continue 

        // its code path until it has completed its Coroutine (method execution)

        // Wait for MoveToMiddle() to finish executing

        yield return StartCoroutine(MoveToMiddle());

        // Wait for x seconds

        yield return new WaitForSeconds(secondsInMiddle);

        // Wait for MoveOutsideScreenAndReset() to finish executing

        yield return StartCoroutine(MoveOutsideScreenAndReset());

    }

}

IEnumerator MoveToMiddle()

{

    while (transform.position.x > worldMiddleX)

    {

        transform.Translate(-(speed * Time.deltaTime), 0f, 0f);

        yield return null;

        // yield return null here will make this loop pause until next frame

        // so that it doesn't just do all the loops instantly and teleport your sprite

    }

}

IEnumerator MoveOutsideScreenAndReset()

{

    while (transform.position.x > worldLeftX)

    {

        transform.Translate(-(speed * Time.deltaTime), 0f, 0f);

        yield return null;

        // yield return null here will make this loop pause until next frame

        // so that it doesn't just do all the loops instantly and teleport your sprite

    }

    // Change to the next sprite

    nextPokemonSprite();

    // Reset the position, then the Update() method will start again from the top

    // since this method will have fully executed

    Vector3 pos = transform.position;

    pos.x = worldRightX;

    transform.position = pos;

}

// If we're at the last Pokemon in the Pokemons array, start over at 0

void nextPokemonSprite()

{

    currentPokemon++;

    if (currentPokemon == Pokemons.Length)

        currentPokemon = 0;

    sr.sprite = Pokemons[currentPokemon];

}