(cache)tarthechie/C#/BlackOut.cs at main · Laateu/tarthechie · GitHub

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

public class BlackOut : MonoBehaviour
{
private Image image;

void Start()
{
image = GetComponent<Image>();
image.color= new Color32(0,0,0,0);
}

void Update()
{
if(Input.GetKeyDown(KeyCode.A)){
StartCoroutine(Black_Out(5.0f,100));
}
}

IEnumerator Black_Out(float time,int N){
int alpha = 0; //アルファ値
float step = time / N; //1ループでのアルファ値の変化幅
/* ループ */
for (int i = 0;i < N;i++){
alpha = 255 * (i + 1) / N;
image.color = new Color32(0, 0, 0, (byte)alpha);
yield return new WaitForSeconds(step); //ウェイト
}
}
}