最后。经过所有的尝试，我得到了如何得到我需要的效果。张贴一个答案的情况下，如果有人会需要同样的效果：

fun modifyRepeatStyle(_horizontalWrap: Texture.TextureWrap?, _verticalWrap: Texture.TextureWrap?,
                      width: Float=textureRegion.texture.width.toFloat(), height: Float=textureRegion.texture.height.toFloat()){
    var horizontalWrap = _horizontalWrap
    var verticalWrap = _verticalWrap
    repeatHorizontal = _horizontalWrap != null //class variable
    repeatVertical = verticalWrap != null  //class variable
    if (horizontalWrap == null){
        //resize texture if you need
        horizontalWrap = Texture.TextureWrap.ClampToEdge
    }
    if (verticalWrap == null){
        //resize texture if you need
        verticalWrap = Texture.TextureWrap.ClampToEdge
    }
    textureRegion.texture.setWrap(horizontalWrap, verticalWrap)
}

稍后在代码中重写Image.setSize（）方法并将其粘贴到此处：

var regionWidth = width.toInt()
var regionHeight = height.toInt()
if (!repeatHorizontal)
    regionWidth = textureRegion.texture.width
if (!repeatVertical)
    regionHeight = textureRegion.texture.height
textureRegion.setRegion(0,0, regionWidth, regionHeight)
drawable = TextureRegionDrawable(textureRegion)
super.setSize(width, height)