我想制作一张图像幻灯片，由计时器自动更改，而无需按下任何按钮，例如每5秒图像就会更改为另一个。我有一个脚本，但它只会在按下按钮时改变它们。我到处找，但我没有找到关于如何随着时间而不是滑动按钮来做的信息。
这是我现在使用的脚本：
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
public class Slidescript : MonoBehaviour
{
//All _slides in the project, minus the _fadeSlide
[SerializeField]
private List<Transform> _slides = default;
//The panel that overlays all _slides and changes from clear to black
[SerializeField]
private Image _fadeSlide = default;
[Header("Config Values")]
[SerializeField, Tooltip("The duration (in seconds) over which the fade slide will fade in / out")]
private float _fadeDuration = 0.75f;
[SerializeField, Tooltip("All key codes that will move to the next slide if pressed")]
private KeyCode[] _nextSlideKeyCodes = {
KeyCode.D,
KeyCode.RightArrow,
KeyCode.Space
};
[SerializeField, Tooltip("All key codes that will move to the previous slide if pressed")]
private KeyCode[] _previousSlideKeyCodes = {
KeyCode.A,
KeyCode.LeftArrow,
};
//The slide we're currently viewing
private int _currentSlide = -1;
// Whether the fade slide is currently fading
private bool _isTransitioning = false;
private void Start()
{
// Set our fade to black slide to black so that the audience can not see the first slide
_fadeSlide.color = Color.black;
}
public void Update()
{
//Check for arrow keys/space bar down so we can fade the fadePanel accordingly
ListenForInput();
}
private void ListenForInput()
{
// Ignore input if we're in the middle of a transition
if (_isTransitioning)
{
return;
}
//If we strike the space bar or right arrow key, proceed to the next slide
if (_nextSlideKeyCodes.Any(Input.GetKeyDown))
{
NextSlide();
}
//If we strike the left arrow key, return to the previous slide
if (_previousSlideKeyCodes.Any(Input.GetKeyDown))
{
PreviousSlide();
}
//If we strike the Esc key, quit the application
if (Input.GetKeyDown(KeyCode.Escape))
{
Application.Quit();
}
}
private void NextSlide()
{
//If we're on the very last slide already..
if (_currentSlide == _slides.Count - 1)
{
// Exit early
return;
}
//Increment the slide count
_currentSlide++;
// Transition to the next slide
StartCoroutine(SlideTransition());
}
private IEnumerator SlideTransition()
{
// Mark our fading slide as currently fading
_isTransitioning = true;
// Fade to black
yield return StartCoroutine(FadeToTargetColor(targetColor: Color.black));
// Set only our current slide active - and all others inactive
_slides.ForEach(slide => slide.gameObject.SetActive(_slides.IndexOf(slide) == _currentSlide));
// Fade to clear
yield return StartCoroutine(FadeToTargetColor(targetColor: Color.clear));
// Mark our fading slide as no longer fading
_isTransitioning = false;
}
private void PreviousSlide()
{
//If the current slide is the very first slide, ignore the rest of this method
if (_currentSlide == 0)
{
return;
}
//Decrement the current slide
_currentSlide--;
// Transition to the previous slide
StartCoroutine(SlideTransition());
}
private IEnumerator FadeToTargetColor(Color targetColor)
{
// The total amount of seconds that has elapsed since the start of our lerp sequence
float elapsedTime = 0.0f;
// The color of our fade panel at the start of the lerp sequence
Color startColor = _fadeSlide.color;
// While we haven't reached the end of the lerp sequence..
while (elapsedTime < _fadeDuration)
{
// Increase our elapsed time
elapsedTime += Time.deltaTime;
// Perform a lerp to our target color
_fadeSlide.color = Color.Lerp(startColor, targetColor, elapsedTime / _fadeDuration);
// Wait for the next frame
yield return null;
}
}
}
您可以使用InvokeRepeating并将可见图像更改为next，而不是使用这种复杂的逻辑；
public List<Sprite> _slides;
void Start(){
InvokeRepeating(nameof(ShowSlideShow),1, 5);
}
int slideNumber = 0;
void ShowSlideShow(){
slideNumber++;
if(slideNumber > _slides.Count)
slideNumber = 0;
GetComponent<Image>().sprite = _slides[slideNumber];
}