unity image 设置图片

从任意文件目录下读取文件并在unity中显示：

1）读取目标文件

byte[] imageByte = File.ReadAllBytes(imagePath);

2）转换成纹理

 texture.LoadImage(imageByte);

3)转换成精灵

Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0, 0));

4）给image赋值

image.sprite = sprite;

如果图片较大，速度转换会相应变慢，可以考虑吧image换成RawImage，然后通过rawImage.texture = texture直接赋值，省略第三步

全代码

    public void SetImageTexture2D( string imagePath， RawImage image)
{
        Stopwatch sw = new Stopwatch();
        sw.Start();
        
        byte[] imageByte = File.ReadAllBytes(imagePath);
        Texture2D texture = new Texture2D(1, 1);

        texture.LoadImage(imageByte);
        image.texture = texture;
        sw.Stop();
        print(sw.ElapsedMilliseconds);
        //Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0, 0));
        //image.sprite = sprite;
    }